Asme B18.2.5M
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ДАННЫЙ МАТЕРИАЛ ПРЕДОСТАВЛЕН ИСКЛЮЧИТЕЛЬНО ДЛЯ ОЗНАКОМЛЕНИЯ
ASME B18.2.5M-2009
C o p y r i g h t e d m a t e r i a l l i c e n s e d t o S t a n f o r d U n i v e r s i t
Metric 12-Point Flange Screws
y b y T h o m s o n S c i e n t i f i c ( w w w . t e c h s t r e e t . c o m ) , d o w n l o a d e d o n O c t 0 5 -2 0 1 0 b y S t a n f o r d
U n i v e r s i t y U s e r . N o
A N A M E R I C A N N A T I O N A L S T A N D A R D
u f r t h e r r e p r o d u c t i o n o r d i s t r i b u t i o n i s p e r m
i t t e d . U n c o n
Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction reproduction may be made of this material without written written consent of ASME.
t o r l l e d w
C o p y r i g h t e d m a t e
ASME B18.2.5M-2009
Metric 12-Point Flange Screws
r i a l l i c e n s e d t o S t a n f o r d
U n i v e r s i t y b y T h o m s o n S c i e n t i f i c ( w w w . t e c h s t r e e t . c o m ) , d o w n l o a d e d o n O c t 0 5 -2 0 1 0 b y S t a n f o r d
U n i v e r s i t y U s e r . N o f u r t h
A N A M E R I C A N N A T I O N A L S T A N D A R D
Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
Date of Issuance: August 14, 2009
e r r e p r o d u c t i o n o r d i s t r i b u t i o n i s p e r m
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o r d U n i v e r s i t y b y T h o m s o n S c i e n t i f i c ( w w w . t e c h s t r e e t . c o m ) , d o w n l o a d e d o n
This Standard will be revised when the Society approves the issuance of a new edition. There will be no addenda issued to this edition. ASME issues written replies to inquiries concerning interpretations of technical aspects of this Standard. Periodically certain actions of the ASME B18 Committee may be published as Cases. Cases Cases and interp interpret retati ations ons are publis published hed on the ASM ASME E Web Web sit site e und under er the Commi Committe ttee e Pages Pages at http://cstools.asme.org as they are issued.
ASME is the registered trademark of The American Society of Mechanical Engineers.
O c t 0 5 -2 0 1 0 b y S t a n f o r d
This code or standard was developed under procedures accredited as meeting the criteria for American National Standards. The Standards Committee that approved the code or standard was balanced to assure that individuals from competent and concerned interests have had an opportunity to participate. The proposed code or standard was made availa available ble forpublicrevie forpublicreview w andcomme andcomment nt that that pro provid vides es an opp opport ortuni unity ty for additio additiona nall public public inp input ut fro from m ind indust ustry ry,, academ academia, ia, regulatory agencies, and the public-at-large. ASME does not “approve,” “rate,” or “endorse” any item, construction, proprietary device, or activity. ASME does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for infringement of any applicable letters patent, nor assumes any such liability. Users of a code or standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility. Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted as government or industry endorsement of this code or standard. ASME accepts responsibility for only those interpretations of this document issued in accordance with the established ASME procedures and policies, which precludes the issuance of interpretations by individuals.
U n i v e r s i t y U s e r . N o f u r t h e r r e p r o d u c t i o n o r d i s t r i b u t i o n i s p e r m
No part of this document may be reproduced in any form, in an electronic retrieval system or otherwise, without the prior written permission of the publisher.
The American Society of Mechanical Engineers Three Park Avenue, New York, NY 10016-5990
Copyright © 2009 by THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS All rights reserved Printed Print ed in U.S.A.
i t t e d . U n c o n t r o l l e d w
Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
C o p y r i g h t e d m a t e r i a l l i c e n s e d t o S t a n f o r d
CONTENTS Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Committee Roster . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Correspondence With the B18 Committ ee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
v vi vii 1
U n i v e r s i t y b y T h
2
Compar omparis ison on With With ISO Sta Standa ndard rdss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Re Refe feren rence ced d Sta Standa ndard rdss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Termi ermino nolo logy gy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Di Dim mension ions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Top of Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Head Heigh ight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Wren Wrench chin ing g Heig Height ht.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Ga Gagi ging ng of 12 12-P -Poi oint nt Fl Flan ange ge Head Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Po Posi siti tion on of Head Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Fla lang nge e . . . . . . .. . . . . .. . . . . .. . . . . . .. . . . . .. . . . . . .. . . . . .. . . . . . .. . . . . .. . . . . . .. . . . . .. . . . .
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Beari Bearing ng Surfac Surface e. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Fil illlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Bo Body dy Diam Diamet eter er . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Leng ngth th . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Point ints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Str Straig aight htnes nesss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Th Thre read adss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Th Thre read ad Leng Length th . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Mat Material erialss an and dM Mech echanic anical al Pro Propertie pertiess . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Ide Identi ntific ficati ation on Sy Symbo mbols ls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Fini inish sh . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Work orkma mans nship hip.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Insp Inspecti ection on and Quality Quality Assuranc Assurance e. . . . . . .. . . . . .. . . . . . .. . . . . .. . . . . . .. . . . . .. . . . . . .. . . . .
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Dime Dimensio nsional nal Co Confor nformanc mance e . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Clea Clearan rance ce Ho Holes les.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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De Desi sign gnat atio ion n . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Tables 1 Dimensions of 12-Point Flange Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Gaging of 12-Point Flange Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Tolerance Zones . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Dimensions of Type F Underhead Fillets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 4 4 5
iii Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
o m s o n S c i e n t i f i c ( w w w . t e c h s t r e e t . c o m ) , d o w n l o a d e d o n O c t 5 0 -2 0 1 0 b y S t a n f o r d
U n i v e r s i t y U s e r . N o f u r t h e r r e p r o d u c t i o n o r d i s t r i b u t i o n i s p e r m i t t e d . U n c o n t r o l l e d w
C o p y r i g h t e d m
5 6 7 8 9 10
Dimensions of Type U Underhead Fillets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions of Reduced Body Diameter (Type R) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Le Leng ngth th Toler oleran ance ces, s, L L,, mm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Dimensions of Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Lengths, L s . . . . . . . . . . . . . . . . . . . . . . Maxim Maximum um Gr Grip ip Leng Length ths, s, L L G, and Minimum Body Lengths, L Thread Lengths . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 7 7 7 8 9
t a e r i a l l i c e n s e d t o S t a n f o r d
U n i v e r s i t y b y T h o m s o n S c i e n t i f i c ( w w
w . t e c h s t r e e t . c o m ) , d o w n l o a d e d o n O c t 0 5 -2
0 1 0 b y S t a n f o r d
U n i v e r s i t y U s e r . N o f u r t h e r r e p r o d u c t i o n o r d i s t r i b u t i o n i s p e r m
iv Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
FOREWORD The B18 Standards Committee for the standardization of bolts, screws, nuts, rivets, and similar fasteners was organized in March 1922 as the B18 Sectional Committee under the aegis of the American Engineering Standards Committee (later the American Standards Association, then the Uni United ted States States of Ame Americ ricaa Sta Standa ndard rdss Institu Institute te and and,, as of Octobe Octoberr 6, 1969, 1969, the Ame Americ rican an Nation National al Standards Institute, Inc.), with the Society of Automotive Engineers and the American Society of Mechanical Engineers as joint sponsors. In subsequent years, the Committee came under the sole sponsorship of the American Society of Mechanical Engineers (ASME). B18 Subcommittee 2 was established and charged with the responsibility for the technical content of standards covering wrench head bolts and nuts. In the late 1980s, a draft of B18.2.5M was created and revised for approval. However, in April of 1995, efforts to finalize a draft of this Standard were abandoned. At its meeting on November 28, 2006, B18 Subcommittee 2 again took up the development of this Standard. This Standard is the result of those efforts. This Standard was approved as an American National Standard on April 16, 2009.
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C o p y r i g h t e d m a t e r i a l l i c e n s e d t o S t a n f o r d U n i v e r s i t y b y T h o m s o n S c i e n t i f i c ( w w w . t e c h s t r e e t . c o m ) , d
o w n l o a d e d o n O c t 0 5 -2 0 1 0 y b S t a n f o r d
U n i v e r s i t y U s e r . N o f u r t h e r r e p r o d u c t i o n o r d i s t r i b u t i o n i s p e r m
v Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
ASME B18 COMMITTEE Standardization of Bolts, Nuts, Rivets, Screws, Washers, and Similar Fasteners (The following is the roster of the Committee at the time of approval of this Standard.)
STANDARDS COMMITTEE OFFICERS D. A. Clever, Chair D. S. George, Vice Chair R. D. Strong, Vice Chair C. J. Gomez, Secretary
STANDARDS STA NDARDS COMMITTEE COMMITTEE PERSONNEL V V.. Cartina, Continental-Aero D. A. Clever, Deere & Co. A. P. Cockman, Cockman, Ford Motor Co. B. D. Burnside, Alternate, Ford Motor Co. R. L. Crane, The American Society of Mechanical Engineers J. S. Foote, Contributing Member, Trade Association Management, Inc. D. S. George, ND Industries J. Greenslad Greenslade, e, Industrial Fasteners Institute J. J. Grey, Contributing Member, Fastener Consulting Services, Inc. B. Hasiuk, Contributing Member, Defense Supply Center Philadelphia A. Herskovitz, Herskovitz, Consultant
W. H. Kopke, Consultant W. J. Lutkus, Emhart Teknologies D. McCrindle, Canadian Fasteners Institute M. D. Prasad, Contributing Member, Global M&F Solutions, Inc. S. Savoji, ITW Medalist W. R. Schevey, Contributing Member, BGM Fastener Co., Inc. W. R. Stevens, Ramco R. D. Strong, General Motors Corp. S. W. Vass, Consultant C. B. Wackrow, Contributing Member, MNP Corp. W. K. Wilcox, Consultant C. B. Williamson, Fastenal Co. C. J. Wilson, Consultant
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C o p y r i g h t e d m a t e r i a l l i c e n s e d t o S t a n f o r d U n i v e r s i t y b y T h o m s o n S c i e n t i f i c ( w w w . t e c h s t r e e t . c o m ) , d o w n l o a d e d o n O c t 0
J. Jennings, Contributing Member, Naval Surface Warfare Center J. F. Koehl, Contributing Member, Spirol International Corp.
R. B. Wright, Contributing Member, Wright Tool J. G. Zerats Zeratsky, ky, National Rivet and Manufacturing Co.
SUBCOMMITTEE 2 — EXTERNALLY DRIVEN FASTENERS (B18) J. Greenslad Greenslade, e, Chair, Industrial Fasteners Institute C. B. Williamson, Vice Chair, Fastenal Co. C. J. Gomez, Secretary, The American Society of Mechanical Engineers V V.. Cartina, Continental-Aero L. Claus, ATF, Inc. D. A. Clever, Deere & Co. A. P. Cockman, Cockman, Ford Motor Co. C. A. Dugal, TSP B. A. Dusina, Federal Screw Works M. A. Elmi, Caterpillar, Inc. J. S. Foote, Trade Association Management, Inc. D. S. George, ND Industries A. Herskovitz, Herskovitz, Consultant M. W. Holubecki, Electric Boat Corp. J. Hubbard, Leland-Powell Fasteners, Inc.
J. Jennings, Contributing Member, Naval Surface Warfare Center W. H. King, Porteous Fastener Co. J. F. McCarrick, Defense Supply Center Philadelphia D. McCrindle, Canadian Fasteners Institute R. B. Meade, Atrona Material Testing Laboratories, Inc. S. Savoji, ITW Medalist R. M. Serabin, Freundlich Supply Co. D. F. Sharp, GMS Structural Engineers G. M. Simpson, Semblex Corp. Q. M. Smith III, Oregon DOT W. R. Stevens, Ramco R. D. Strong, GM Vehicle Engineering Center R. L. Tennis, Consultant S. W. Vass, Consultant C. B. Wackrow, MNP Corp. W. K. Wilcox, Consultant C. J. Wilson, Consultant
vi Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
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a t n f o r d U n i v e r s i t y U s e r . N o f u r t h e r r e p r o d u c t i o n o r d i s t b i r u t i o n i s p e r m i t t e d . U n c o n t r o l l e d w
C o p y r i g h t e d m a t e r i a l l i c e n s e
CORRESPONDENCE WITH THE B18 COMMITTEE General. ASME Standards Standards are developed developed and maintaine maintained d with the inten intentt to repres represent ent the consensus of conce consensus concerned rned interes interests. ts. As such, users users of this Stand Standard ard may may interact interact with the Committee Committee by req ue st in g inte in te rpret rp ret at ions io ns,, pro po posi sing ng revis rev is ions io ns,, an and d at te ndi ng Com mitt mi tt ee meet me et ings in gs.. Correspondence should be addressed to: Secretary, B18 Standards Committee The American Society of Mechanical Engineers Three Park Avenue New York, NY 10016-5990 Proposing Propos ing Revisio Revisions. ns. Revisions are made periodically to the Standard to incorporate changes thatt appear tha appear nec necess essary ary or desira desirable ble,, as dem demons onstra trated ted by the exp experi erienc encee gai gained ned fr from om the app applica lication tion of the Standard. Approved revisions will be published periodically. The Committee welcomes proposals for revisions to this Standard. Such proposals should be as specific as possible, citing the paragraph number(s), the proposed wording, and a detailed description of the reasons for the proposal, including any pertinent documentation. Proposing a Case. Cases may be issued for the purpose of providing alternative rules when justified, to permit early implementation of an approved revision when the need is urgent, or to provide rules not covered by existing provisions. Cases are effective immediately upon ASME approval and shall be posted on the ASME Committee Web page. Requests for Cases shall provide a Statement Statement of Need and Background Information. The request request should identify the standard, the paragraph, figure or table number(s), and be written as a Question and Reply in the same format as existing Cases. Requests for Cases should also indicate the applicable edition(s) of the standard to which the proposed Case applies. Interpretations. Upon request, the B18 Standards Committee will render an interpretation of any requirement of the Standard. Interpretations can only be rendered in response to a written request sent to the Secretary of the B18 Standards Committee.
d t o S t a n f o r d
U n i v e r s i t y b y T h o m s o n S c i e n t i f i c ( w w w . t e c h s t r e e t . c o m ) , d o w n l o a d e d o n O c t 0 5 -2 0 1 0 b y S t a n f o d r
The request forsubmit an interpretation shouldinbethe clear and unambiguous. It is further recommended that the inquirer his/her request following format: Su Subj bjec ect: t: Edit Editio ion: n: Questio Que stion: n:
Ci Cite te the the appl applic icab able le para paragr grap aph h numb number er(s (s)) an and d the the to topi picc of the the inqu inquir iry y. Ci Cite te the the ap appl plic icab able le edit editio ion n of the the Stan Standa darrd fo forr whic which h the the inte interp rprretat etatio ion n is being requested. Phrase Phrase the que questio stion n as a reque request st for an inter interpr preta etation tion of a specifi specificc requi require remen mentt suitable for general understanding and use, not as a request for an approval of a proprietary design or situation. The inquirer may also include any plans or drawings that are necessary to explain the question; however, they should not contain proprietary names or information.
Re Reque quests sts that that ar aree not in this this format format ma may y be rewri rewrittenin ttenin the app appro ropri priate ate for formatby matby the Com Commit mittee tee prior to being answered, which may inadvertently change the intent of the original request. ASME procedure proceduress pro provide vide for rec reconsid onsideratio eration n of any interpretation interpretation when or if additional additional information that might affect an interpretation is available. Further, persons aggrieved by an interpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not “approve,” “certify,” “rate,” or “endorse” any item, construction, proprietary device, or activity. Attending Committee Meetings. The B18 Standa Standard rdss Commit Committee tee regul regularl arly y holds holds meeting meetings, s, which which are open to the public. Persons wishing to attend any meeting should contact the Secretary of the B18 Standards Committee. vii Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
U n i v e r s i t y U s e r . N o f u r t h e r r e p r o d u c t i o n o r d i s t r i b u t o i n i s p e r m i t t e d . U n c o n t r o l l e d w
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U
iv n i e r s i t y U s e r . N o f
u r t h e r r e p r o d u c t i o n o r d i s t r i b u t i o n i s p e r m
viii Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
ASME B18.2.5M-2009
METRIC 12-POINT FLANGE SCREWS 1 SC SCO OPE This Standard covers the complete dimensional and general gene ral data for metric metric series series 12-point 12-point flange scre screws ws recognized as American National Standard. The inclusio sion n of dimens dimension ional al data in this this Stan Standar dard d is not intend intended ed to imp imply ly that that all prod product uctss descri described bed ar aree sto stock ck prod producti uction on items.
2 CO COMPA MPARISONS RISONS WITH ISO ISO STA STANDARD NDARDS S Letter symbols designating dimensional characteristics are in accord with ISO 225, except where capital letters have been used instead of lowercase letters in the ISO standards.
3 REFERENCED REFERENCED STANDA STANDARDS RDS Thefollowing is a listof publica Thefollowing publication tionss refer referenc enced ed in this this Standard. Unless otherwise specified, the standard(s) referenced shall be the most recent issue at the time of order placement. ASME B1.3M, Screw Thread Gaging Systems for Dimensional Acceptability — Inch and Metric Threads (UN, UNR, UNJ, M, and MJ) ASME B1.13M, Metric Screw Threads — M Profile ASME B18.2.8, Clearance Holes for Bolts, Screws, and Studs ASME B18.2.9, Straightness Gage and Gaging for Bolts and Screws ASME B18.12, Glossary of Terms for Mechanical Fasteners ASME B18.18.1M, Inspection and Quality Assurance for General Purpose Fasteners ASME B18.18.2M, Inspection and Quality Assurance for High-Volume Machine Assembly Fasteners ASME B18.18.4M, Inspection and Quality Assurance for Highly Specialized Engineered Engineered Applications for Metric Fasteners ASME B18.24, Part Identifying Number (PIN) Code
ASTM A 574M, Standard Specification for Alloy Steel Socket-Head Cap Screws ASTM F 468M, Standard Specification for Nonferrous Bolts, Hex Cap Screws, and Studs for General Use ASTM F 568M, Standard Specification for Carbon and Alloy Steel Externally Threaded Metric Fasteners ASTM F 738M, Standard Specification for Stainless Steel Metric Bolts, Screws, and Studs ASTM F 788/F 788M, Standard Specification for Surface Discontinuities of Bolts, Screws and Studs, Inch and Metric Series Publisher: American Society for Testing and Materials (ASTM International), 100 Barr Harbor Drive, West Conshohocken, PA 19428-2559 (www.astm.org) ISO 225, Fasteners — Bolts, Screws, Studs, and Nuts — Symbols and Designations of Dimensions P ub ub llii ssh h eerr : In ntt er er na na ti ti o on n aall O rrg g an an iz iz aatt io io n fo orr Standardization (ISO), 1 ch. de la Voie-Creuse, Case Postale 56, CH-1211, Gene`ve 20, Switzerland/Suisse (www.iso.org)
4 TERMIN TERMINOL OLOG OGY Y For definitions of terms relating to fasteners or features tures the there reof of used used in this this Stan Standar dard, d, referto referto ASME ASME B18 B18.12 .12..
5 DIME DIMENS NSIO IONS NS (a) All dimensions in this Standard are given in millimeters (mm), and apply before any coating, unless stated otherwise. (b) Symbols specifying geometric characteristics are in accordance with ASME Y14.5.
6 TOP OF HE HEAD AD The top of head shall be chamfered or rounded with diameter of chamfer circle or start of rounding being equal to maximum width across flats within a tolerance
i t t e d . U n c o n t r o l l e d w
C o p y r i g h t e d m a t e r i a l l i c e n s e d t o S t a n o f r d U n i v e r s i t y b y T h o m s o n S c i e n t i f i c ( w w w . t e c h s t r e e t c . o m ) , d o w n l o a d e d o n O c t 0 5 -2 0 1 0 b y S t a n f o r d U n i v e
s r i t y U s e r . N o f u r t h e r r e p r o d u c t i o n o
of 15% of maximum width across flats. System Standard for B18 Externally Threaded Fasteners ASME Y14.5, Dimensioning and Tolerancing Publisher: The American Society of Mechanical Engineers (ASME), Three Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, Box 2300, Fairfield, NJ 07007-2300 (www.asme.org)
7 HE HEAD AD HE HEIG IGHT HT The head height, K , is the distance, parallel to the axis of the screw, from the plane of the bearing circle to the top of the head, not including any raised markings (see section 21). 1
Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
ASME B18.2.5M-2009
8 WRE WRENCH NCHING ING HEIGHT HEIGHT Corners of the 12 points shall be fully formed and reasonably uniform over the wrenching height, height, K w . Head drive root radius, R radius, R 4 , applies to the entire length of the wrenching height, K height, K w (see Table 1).
which also specifies limits, or Type U, as shown in Table 5, at the option of the manufacturer unless the fillet type is specified by the purchaser. The fillet shall be a smooth and continuous curve fairing smoothly into thebearing thebeari ng sur surfac facee and theshank wit withinthe hinthe lim limits its specispecified. For Type F, no radius in the fillet contour shall be less than R than R 1 minimum specified in Table 4.
9 GAG GAGING ING OF OF 12-POI 12-POINT NT FLANG FLANGEE HEA HEAD D The head shall be gaged using two ring gages, A and B, to demonstra demonstrate te the coincidental coincidental acceptability acceptability of wrenching height, corner fill, and width across corners. Gage A shall be placed over the head and shall seat on the flange. Gage B shall be placed on the top of the head normal to the screw axis. The two gages shall not be in contact (see Table 2).
10 POSIT POSITION ION OF HEAD HEAD At maximum material condition, the axis of the 12 points of the head shall be within a positional tolerance zone of the diameter specified in Table 3 with respect to the axis of the shank over a distance under the head equal to the nominal screw diameter, D D.. The datum shall be as close to the head as practicable, but within 0.5D 0.5D from the head, and shall be either wholly plain body or wholly the thread major diameter, not including the thread runout or the underhead fillet.
14 BODY BODY DIAM DIAMET ETER ER The diameter of the body, D s , on screws that are not threaded full length shall be within the limits specified in Table 1, unless the purchaser specifies screws with reduced reduce d diameter body. body. For screws threaded full length, the diameter of the unthreaded shank under the head shall neither exceed the maximum body diameter, Ds maximum, specified in Table 1, nor be less than the minimum body diameter, diameter, Ds minimum, specified in Table 4 or 5. Screws of nominal lengths equal to or greater than the shortest nominal lengths specified in Table 6 may be obtained with reduced diameter body, if so specified. Where reduced diameter body (or “Type R”) is specified, the body diameter, D2 , shall be within the limits specified in Table 6. The screw shall have a shoulder under the head. The diameter, D s , and the sh shou ould lder er shal shalll be as sp spec ecifi ified ed in Table able 6. length, L2 , of the
11 FLAN FLANGE GE
15 LE LENG NGTH TH
Th Thee to top p su surf rfac acee of th thee flan flangeshal geshalll beconica beconicall or slig slight htly ly appl plie iess bo bothat that the the corn corner erss rounded (con rounded (convex). vex). Radius, Radius, R2 , ap and at the flats of the 12 points. The contour of edge at flange periphery, between the maximum flange diameter, Dc max maximu imum, m, and the min minimu imum m bea bearin ring g circle circle dia diammeter, Dw minimum, shall be optional provided that the eter, minimum flange edge thickness, C thickness, C minimum, is maintained at the minimum bearing circle diameter, Dw minimum.
The length of the screw is the distance, parallel to the axis of the screw, from the plane formed by the underhead bearing circle diameter to the extreme end of the screw. Tolerances for screw lengths are specified in Table 7.
12 BEARIN BEARING G SURFAC SURFACEE
The plane formed by the bearing circle shall be perpendicular to the axis of the shank, over a length under the head equal to the nominal screw diameter, D, within the circular runout as specified in Table 3. The measurement of bearing face runout shall be made at the actual bearing circle (i.e., at the line of highest points on any radi radial al lin line, e, e. e.g. g.,, by us usee of stra straig ight ht edge edge an anvi vil) l).. Th Thee da datu tum m shall be as close to the head as practical, but within 0.5D 0.5 D from the head, and shall be either wholly plain body or wholly thread major diameter, not including the thread runout or the underhead fillet.
16 POIN POINTS TS Th Thee end end of the the sc scre rew w shal shalll be cham chamfe fere red d or roun rounde ded d at the manufacturer’s option from approximately 0.40 mm below thethe minor of the thread. length of the point to firstdiameter full-formed thread at The major diameter, as determined by the distance the point enters into a cylindrical NOT GO major diameter ring gage, shall not exceed U exceed maximum, specified in Table 8. The end of the U maximum, screw shall be reasonably square with the axis of the screw, and where pointed blanks are used, the slight rim or cup resulting from roll threading shall be permissible. At the manufacturer’s option, the end of the screw may have a rounded point of radius, R e , as specified in Table 8.
17 STRAIG STRAIGHTN HTNES ESS S 13 FILL FILLET ET The fillet fillet configuration configuration at at the junction junction of the head aand nd
At maximum material condition, the derived median line of the screw body and thread major diameter shall
r d i s t r i b u t i o n i s p e r m i t t e d . U n c o n t r o l l e d w
C o p y r i g h t e d m a t e r i a l l i c e n s e d t o S t a n f o r d U n i v e r s i t y b y T h o m s o n S c i e n t i f i c ( w w w . t e c h s t r e e t . c o m , ) d o w n l o a d e d o n O c t 0 5 -2 0 1 0 b y S t a n f o r d
U n i v e r s i t y
U s e r . N o f u r t h e r r e p r o d u c t i o n o r d i s t r i b u t i o n i s p e r m
shank sha nk shall shall confor conform m to eitherTy eitherType pe F, as sho shown wn in Tabl ablee 4,
be within a straightness tolerance zone of a diameter 2
Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
ASME B18.2.5M-2009
t 4 o R m u d o , R s a m i e e i u x v d a H i r a M D R t m e , u e l l s u m g i F i i n x a d p a l a o R M F T
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3 Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
3 7 . 3 1
3 7 . 5 1
7 6 . 9 1
7 6 . 9 2
1 6 . 5 3
4 1
2 4 6 0 1 1 1 2
4 0 6 2 3 3
4 1
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4 0 6 2 3 3 M M M
s n o i t c e s e e S
i t t e d . U n c o n t r o l l e d w C o p y r i g h t e d m a t e r i a l l i c e n s e d t o S t a n f o r d U n i v e r r s i t y b y T h o m s o n S c i e n t i f i c ( w w w . t e c h s t r e e t . c o m ) , d o w n l o a d e d o n O c t 0 5 -2 0 1 0 b y S t a n f o r d
U n i v e r s i t y U s e r .N N o f u r t h e r r e p r o d u c t i o n o r d i s t r i b u t i o n i s p e r m i t t e d . U c n o n t r o l l e d w
C o p y r i g h t e d m a t e r i a l l i c e n s e d t o S t a n f o r d
ASME B18.2.5M-2009
Table able 2 Gaging Gaging of 12 12-Poin -Pointt Flange Flange Head Head Gage B
T b
T a
Gage A
Gage A Nominal Screw Diameter and Thread Pitch
Inside Diameter, W a
Gage B Thickness, T a
Inside Diameter, W b
Max.
Min.
Max.
Min.
Max.
Min.
Minimum Thickness, T b
M5 0.8 M6 1 M8 1.25 M10 1.5
5.79 6.94 9.25 11.56
5.78 6.93 9.24 11.55
1.86 2.20 2.96 3.75
1.85 2.19 2.95 3.74
5.59 6.69 8.99 11.19
5.58 6.68 8.98 11.18
3.0 3.0 4.0 4.0
M12 1.75 M14 2 M16 2 M18 2
13.87 16.18 18.49 20.80
13.86 16.17 18.48 20.79
4.50 5.29 6.09 6.87
4.49 5.28 6.08 6.86
13.49 15.79 17.99 20.38
13.48 15.78 17.98 20.37
5.0 5.0 6.0 6.0
M20 2.5 M24 3 M30 3.5 M36 4
23.11 27.73 34.66 41.59
23.10 27.72 34.65 41.58
7.62 9.21 11.59 13.88
7.61 9.20 11.58 13.87
22.49 26.99 34.29 41.19
22.48 26.98 34.28 41.18
7.0 8.0 9.0 11.0
GENERAL NOTES: (a) Dimension Dimensionss are in millimeter millimeters. s. (b) Refer to se section ction 9.
Table able 3 Tolerance olerance Zones Zones No Nomi mina nall Sc Scre rew w Diameter and Thread Pitch
Po Posi siti tion on of He Head ad-t -too-Sh Shan ank k Tolerance Zone Diameter at MMC
Circu ircula larr Run unou outt of Bea eari ring ng Circl ircle e to Shank FIM [Note (1)]
M5 0.8 M6 1 M8 1.25 M10 1.5
0.10 0.12 0.16 0.20
0.14 0.16 0.22 0.27
M12 1.75 M14 2 M16 2 M20 2.5
0.24 0.28 0.32 0.40
0.30 0.35 0.40 0.50
M24 3 M30 3.5 M36 4
0.48 0.60 0.72
0.61 0.76 0.92
GENERAL GENER AL NO NOTE: TE:
Dimen Dimension sionss are in millime millimeters. ters.
NOTE: (1) Circu Circular lar runout runout of bear bearing ing circle to shank is based on 1 deg and the minimum bearing circle diameter, D w min.
4 c
Copyright 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
U n i v e r s i t y b y T h o m s o n S c i e n t i f i c ( w w w . t e c h s t r e e t . c o m ) , d o w n l o a d e d o n O c t 0 5 -2 0 1 0 b y S t a n f o r d
U n i v e r s i t y U s e r . N o u f r t h e r r e p r o d u c t i o n o r d i s t r i b u t i o n i s p e r m
i t t e d . U n c o n t r o l l e d w
C
ASME B18.2.5M-2009
p o y r i g h t e d m a t e
Table 4 Dimensions Dimensions of of Type Type F Underh Underhead ead Fille Fillets ts
19 TH THRE READ AD LENG LENGTH The length of thread on screws is controlled by the maximum grip length, L length, L g maximum, and the minimum body length, Ls minimum, as set forth in paras. 19.1 through 19.4.
Fillet shall lie within this envelope
D a , max.
19.1 Grip Length, Length, L g
D a
The grip length, L length, L g , is the distance, measured parallel to the axis of the screw, from the plane of the bearing circle diameter to the face of a noncounterbored, non-
D b R 1
countersunk GO thread ring gage assembled by hand as far as the thread will permit. For standard diameter length combinations of screws, the values for L for L g maximum are specified in Table 9. For diameter–length com binations not listed in Table 9, the maximum grip length for long screws that are not threaded full length is equal to the nomin nominal al screw length, length, L, minus the reference thread length, B length, B,, as specified in Table 10:
Lf , max. Lf
No Nomi min nal Screw Diameter and Thread Pitch
Max Maximu imum Fillet Maximum Minimum Transition Fillet Fillet Diam amet ete er, Length, Radius, Da L f R 1
Minimum Wire Diameter er,, D s PD-6g
M5 0.8 M6 1 M8 1.25 M10 1.5
5.7 6.8 9.2 11.2
0.6 0.68 1.02 1.02
0.2 0.25 0.4 0.4
4.36 5.21 7.04 8.86
M12 1.75 M14 2 M16 2 M20 2.5
13.7 15.7 17.7 22.4
1.87 1.87 1.87 2.04
0.6 0.6 0.6 0.8
10.68 12.5 14.5 18.16
M24 3 M30 3.5 M36 4
26.4 33.4 39.4
2.04 2.89 2.89
0.8 1 1
21.8 27.46 33.12
GENERAL GENER AL NO NOTE: TE:
L g maximum
p
− B L nominal − B
For short short scr screws ews of nomina nominall length lengths, s, L, that that are are shor shorte terr than thelengt than thelengths hs spe specif cified ied in Table able 10 for screws screws thread threaded ed full length, L g maximum
p
A maximum A maximum
as specified in Table 10.
19.2 Body Length, Length, L s Body length, L length, Ls , on long screws that are not threaded full length is the distance, parallel to the axis of the screw, from the plane of the bearing circle to the last scratc scratch h of threador threador top of theextrusio theextrusion n ang angle, le, whi whiche chever ver is closer to the head. For standard diameter-length comminimum um are spec specii binations of screws, the values for Ls minim fied in Table 9. For diameter–length combinations not listed in Table 9, the minimum body length on screws thatt are tha are not thread threaded ed full full length length is equal equal to themaxim themaximum um grip length, as determined above, minus the transition thread length, X length, X , as specified in Table 10:
Dimension Dimensionss are in millime millimeters. ters.
equal to 0.006 times length, expressed as a two-place decimal. A gage and gaging procedure for checking screw straightness are given in ASME B18.2.9.
18 TH THRE READ ADS S 18.1 Thread Thread Series Series and Toler olerance ance Cla Class ss
Ls minimum
Screw threads shall be general-purpose metric screw thread thr eadss with tole toleran rance ce Class Class 6g conf conform orming ing to ASME B1.13M, unless otherwise specified by the purchaser. For screws with additive finish, size limits for tolerance Class 6g apply before coating, and the thread profile after coating is subject to acceptance using a 6h GO thread gage and tolerance Class 6g thread NOT GO thread gage.
p
− X L g maximum − X
19.3 Thread Thread Leng Length, th, B The thread length, B length, B,, specified in Table 10, is a reference dimension intended for calculation purposes only, and is the distance, parallel to the axis of the screw, from the extreme end of the screw to the last complete (full-form) thread. 19.4 Transiti Transition on Thread Length, X
18.2 Thread Thread Gaging Gaging
The transition transition thread thread lengt length, h, X , spec specif ifie ied d in Table able 10, 10, is a ref refere erence nce dime dimension nsion intended intended for calculation calculation purposes purposes only. It includes the length of incomplete threads and tolera tolerance ncess on gri grip p lengthand lengthand bod body y length length.. Thetran Thetransiti sition on
Unless otherwise specified, dimensional acceptability of screw threads shall be determined based on System 21, ASME B1.3M. 5
Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
ASME B18.2.5M-2009
i a l l i c e n s e d t o S t a n f o r d
U n i v e r s i t y b y h T o m s o n S c i e n t i f i c ( w w w . t e c h s t r e e t . c o m ) , d o w n l o a d e d o n O c t 0 5 -2 0 1 0 b y S t a n f o r d
U n i v e r s i t y U s e r . N o f u r t h e r r e p r o d u c t i o n o r d i s t r i b u t i o n i s p e r m
i t t e d . U n c o n t r o l l e d w
C o p y r g i h t e d m a t e r i a l l i c e n s e d t o S t a n f o
r d U n i v e r s i t y b y T h o m s o n S c i e n t i f i c ( w w w . t e c h s t r e e t . c o m ) , d o w n l o a d e d o n
Table 5 Dimensio Dimensions ns of Type Type U Underhead Underhead Fill Fillets ets
Junction of fillet with bearing surface to be a smooth blend
V, max.
V, min.
R 3, max. R 3, min.
Lf
Junction of fillet with shank to be a smooth blend D s D v D a
Nominal Screw Diameter
Maximum Undercut Diameter, Da
Maximum Fillet Diameter, Dv
Minimum Body Diameter for Short Screws, D s
Maximum Fillet Length, L f
Undercut Radius, R 3
Undercut Depth, V
Max.
Min.
Max.
Min.
M5 M6 M8 M10
6.2 7.5 10.0 12.5
5.5 6.6 8.8 10.8
4.36 5.21 7.04 8.86
1.4 1.6 2.1 2.1
0.25 0.26 0.36 0.45
0.10 0.11 0.16 0.20
0.15 0.20 0.25 0.30
0.05 0.05 0.10 0.15
M12 M14 M16 M20
15.2 17.7 20.5 25.5
12.8 14.8 17.2 21.2
10.68 12.50 14.50 18.07
2.1 2.1 3.2 3.2
0.54 0.63 0.72 0.89
0.24 0.28 0.32 0.40
0.35 0.45 0.50 0.62
0.15 0.20 0.25 0.31
M24 M30
30.7 38.5
25.4 31.7
21.75 27.26
3.2 4.5
1.07 1.33
0.48 0.61
0.75 0.93
0.39 0.49
M36
46.2
38.0
32.77
4.5
1.60
0.73
1.12
0.60
6 Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
O c t 0 5 -2 0 1 0 b y S t a n f o r d
U n i v e r s i t y U s e r . N o f u r t h e r r e p r o d u c t i o n o r d i s t r i b u t i o n i s p e r m i t t e d . U n c o n t r o l l e d w C o p y r i g h t e
ASME B18.2.5M-2009
Table able 6 Dimension Dimensionss of Reduced Reduced Body Diamete Diameterr (Type (Type R)
D s
D 2
d m a t e r i a l l i c e n s e d t o S t a n f o r d
U n i v e r s i t y b y T h o
L2
Shortest Nominal Screw Length, L
Nominal Screw Diameter
Reduced Body Diameter, D 2
Shoulder Diameter, D s [Note (1)]
Shoulder Length, L 2 [Note (1)]
Max. Ma
Min.
Max.
Min.
Max.
Min.
M5 M6 M8 M10
30 35 40 45
4.54 5.39 7.26 9.08
4.36 5.21 7.04 8.86
5 6 8 10
4.82 5.82 7.78 9.78
3.5 4.0 5.0 6.0
2.5 3.0 4.0 5.0
M12 M14 M16 M20
50 55 60 70
10.95 12.77 14.77 18.44
10.68 12.50 14.50 18.16
12 14 16 20
11.73 13.73 15.73 19.67
7.0 8.0 9.0 11.0
6.0 7.0 8.0 10.0
M24 M30 M36
80 100 115
22.11 27.78 33.45
21.80 27.46 33.12
24 30 36
23.67 29.67 35.61
13.0 16.0 19.0
12.0 15.0 18.0
GENERAL GENER AL NO NOTE: TE:
Dimension Dimensionss are in millime millimeters. ters.
NOTE: (1) Shoulder Shoulder is mandatory mandatory (see section 14).
Table able 7 Length Length Toler Tolerance ances, s, L, mm Length Tolerances
Tab able le 8 Dimens Dimension ionss of Point Pointss
Nominal Size, D Nominal Lengths, L , mm
M5 Th Thro roug ugh h M8
M10 M10 Th Thro roug ugh h M36 M36
Nominal Screw Diameter
Approximate Point Radius, Reference
Maximum Point Length, U
Over Over Over Over
6 through 10 10 through 18 18 through 30 30 through 50
±0.29 ±0.35 ±0.42 ±0.50
... ±0.35 ±0.42 ±0.50
M5 M6 M8 M10
7 8.4 11.2 14
1.6 2 2.5 3
Over Over Over Over
50 through 80 80 through 120 120 through 180 180 through 250
±0.60 ±0.70 ±0.80 ±0.92
±0.60 ±0.70 ±0.80 ±0.92
M12 M14 M16 M20
16.8 19.6 22.4 28
3.5 4 4 5
Over 250 through 315 Over 315 through 400 Over 401 through 500
±1.05 ±1.15 ±1.25
±1.05 ±1.15 ±1.25
M24 M30 M36
33.6 42 50.4
6 7 9
GENERAL GENER AL NO NOTE: TE:
Dimension Dimensionss are in millimet millimeters. ers.
7 Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
ASME B18.2.5M-2009
.
4
L
n s i M
0 . 0 . 0 . 0 . 0 . 0 . 0 . 6 6 6 6 6 6 6 1 2 3 4 5 7 9
. x a M
0 . 0 . 0 . 0 . 0 . 0 . 0 . 6 6 6 6 6 6 6 3 4 5 6 7 9 1 1
6 3 M
5 . 3
L
G
.
L
n s i M
0 3 M
. x G L a M
0 . 0 . 0 . 0 . 0 . 0 . 0 . 8 8 8 8 8 8 8 3 4 5 6 7 8 0 1
0 . 8 2 1
.
3
L
0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 5 5 5 5 5 5 5 5 5 1 2 3 4 5 6 7 8 0 1
0 . 5 2 1
n s i M
4 2 M
. x a M
0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 0 0 0 0 0 0 0 0 0 3 4 5 6 7 8 9 0 2 4 1 1 1
L s i
. n M
5 . 5 . 5 . 5 . 5 . 5 . 5 . 5 . 5 . 5 . 5 . 5 3 1 5 9 5 8 5 7 5 6 5 4 5 5 5 3 5 2 5 1 5 1 1
. x
0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 .
L
G
s L
, s h t g n e
5 . 5 . 5 . 5 . 5 . 5 . 5 . 5 . 0 0 0 0 0 0 0 0 2 3 4 5 6 7 8 9
5 2 .
0 2
G
m s o n S c i e n t i f i c ( w w w . t e c h s t r e e t . c o m ) , d o w n l o a d e d o n O c t 5 0 -2 0 1 0 b y S t a n f o r d
U n i v e r s i t y U s e r . N o f u r t h e r r e p r o d u c t i o n o r d i s t r i b u t i o n i s p e r m i t t e d . U n c o n t r o l l e d w
C o p y r i g h t e d m a t e r i a l l i c e n s e d t o S t a n f o r d U n i v e r s i t y b y T h o m s o n S c i e n t i f i c ( w w
L y d o B m u m i n i M d n a , L
G
, s h t g n e L
h c t i P d a e r h T d n a r e t e m a i D w e r c S l a n i m
M
L
2
L
n s i
0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 1 6 6 6 6 6 6 6 6 6 6 1 1 2 3 4 5 6 7 8 9 0 1
. x a M
0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 1 6 6 6 6 6 6 6 6 6 6 2 2 3 4 5 6 7 8 9 0 1 1 1
M
6 1 M
L
G
.
2
L
n s i M
0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 5 0 0 0 0 0 0 0 0 1 1 2 3 4 5 6 7 8 9
. x a M
0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 5 0 0 0 0 0 0 0 0 2 2 3 4 5 6 7 8 9 0 1
4 1 M
5 7 . 1
L
G
.
L
n s i M
3 . 3 . 3 . 3 . 3 . 3 . 3 . 3 . 3 . 0 5 0 5 5 5 5 5 5 1 1 2 2 3 4 5 6 7
x . a M
0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 9 4 9 4 4 4 4 4 4 1 2 2 3 4 5 6 7 8
M
5 2 . 1
L
G
.
M
5 . 5 . 5 . 5 . 5 . 5 . 5 . 5 . 5 . 5 0 5 0 5 0 0 0 0 1 1 2 2 3 4 5 6
. x G L a M
0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 3 8 3 8 3 8 8 8 8 1 1 2 2 3 3 4 5 6
L
n s i
.
L
L
1
L
M
8 . 8 . 8 . 8 . 8 . 8 . 8 . 8 . 5 0 5 0 5 0 5 5 1 1 2 2 3 3 4
. x a M
0 . 0 . 0 . 0 . 0 . 0 . 0 . 0 . 2 7 2 7 2 7 2 2 1 1 2 2 3 3 4 5
n s i
8 M
G
.
n s i M
0 . 0 . 0 . 0 . 0 . 0 . 6 1 6 1 6 1 1 1 2 2 3
. x a M
0 . 0 . 0 . 0 . 0 . 0 . 1 6 1 6 1 6 1 1 2 2 3 3
6 M
8 . 0
L
L
G
n . s i
5 M
L
G
M
0 . 0 . 0 . 0 . 0 . 4 9 4 9 4 1 1 2
. x a M
0 . 0 . 0 . 0 . 0 . 8 3 8 3 8 1 1 2 2
l , a h n t i g m m n m o e N L
w . t e c h s t r e e t . c o m ) , d o w n l o a d e d o n O c t 0 5 -2
8 8 8 8 8 8 8 8 8 8 8 2 3 4 5 6 7 8 9 0 2 4 1 1 1
.
o 2 i p N 1 r M G m u 5 . m 1 i x a 0 1 M
9 e l b a T
a M
5
6
. s r e t e
8 0 2 6 0 5 0 5 0 5 0 5 0 5 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 2 2 3 3 4 4 5 5 6 6 7 8 9 0 1 2 3 4 5 6 8 0 1 1 1 1 1 1 1 1 2
: S E T O N L A R E N E G
. d e d . n e t h m g n m e o l c l l e r u f e r d a e s d e a n e r i l h t d e e r p a p e s t s e n i l d i l d o e s p e p e h t t s n e d e e w h s t e a b d s e n h o t i t e a v n o i b b a
0 1 0 b y S t a n f o r d
U n i v e r s i t y U s e r . N o f u r t h e r r e p r o d u c t i o n o r d i s t r i b u t i o n i s p e r m
o h i l m m s l i c t g m h t n e n g l i n e h s l i n – t o r w i e s t s n e e m w e r a c m i i D D S ) ) ) b ( a ( c (
i t t e d . U n c o n t r o l l e d w
8 Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
ASME B18.2.5M-2009
Table able 10 Thread Thread Lengths Lengths Thread Length, Basic, B (Reference) Nominal Screw Diameter and Thread Pitch
Screw Length, L ≤ 125
Screw Length, L > 125 and ≤ 200
Screws Threaded Full Length Transition Thread Length, X
Screw Length, L
Screw Length, L > 200
(Reference)
Under
Maximum Unthreaded Length Und er Head, A
At Least
Under
Maximum Unthreaded Length Under Head, A
Screw Length, L
M5 0.8 M6 1 M8 1.25 M10 1.5
16.00 18.00 22.00 26.00
22.00 24.00 28.00 32.00
35.00 37.00 41.00 45.00
4.00 5.00 6.25 7.50
10.00 12.00 16.00 20.00
1.20 1.50 1.90 2.20
10.00 12.00 16.00 20.00
25.00 30.00 40.00 45.00
2.40 3.00 4.00 4.50
M12 1.75 M14 2 M16 2 M20 2.5
30.00 34.00 38.00 46.00
36.00 40.00 44.00 52.00
49.00 53.00 57.00 65.00
8.75 10.00 10.00 12.50
24.00 28.00 32.00 40.00
2.60 3.00 3.30 3.90
24.00 28.00 32.00 40.00
55.00 60.00 65.00 80.00
5.30 6.00 6.00 7.50
M24 3 M30 3.5 M36 4
54.00 66.00 ...
60.00 72.00 84.00
73.00 85.00 97.00
15.00 17.50 20.00
48.00 60.00 72.00
4.50 5.40 6.30
48.00 60.00 72.00
90.00 110.00 140.00
9.00 10.50 12.00
from full-form thread thread to incomplete incomplete thread shall be smooth and uniform. The major diameter of the incomplete threads shall not exceed the actual major diameter of the complete (full-form) thread threads. s. The transition transition
21.1 Property Property Class Symbols Symbols Each screw shall be marked in accordance with the requirements requireme nts of the aapplicable pplicable specification for its mate-
C o p y r i g h t e d m a t e r i a l l i c e n s e d t o S t a n f o r d U n i v e r s i t y b y T h o m s o n S c i e n t i f i c ( w w w . t e c h s t r e e t . c o m ) , d
rial and mechanical properties.
threads shall have a rounded root contour.
21.2 Source Source Symbols Symbols
20 MATERIALS MATERIALS AND MECHANICA MECHANICALL PROPERT PROPERTIES IES
Each screw shall be marked to identify its source (manufacturer or private label distributor).
20.1 20. 1 Steel Steel Unless otherwise Unless otherwise specified, specified, steel scre screws ws sha shall ll conform conform to therequ therequir ireme ement ntss of ASTM ASTM F 568M, 568M, Prope PropertyClass12.9 rtyClass12.9 or ASTM A 574M.
22 FINI FINISH SH Unless otherwise specified, screws shall be furnished with one of the following “standard “standard surfaces as manufactured,” at the option of the manufacturer: (a) bright uncoated (b) thermal black oxide (c) chemical black oxide Hydrogen embrittlement tests shall not be required for screws furnished in these conditions. For other other prote protectiv ctivee finish finishes es specifi specified ed with with an app applica lica- ble finish specification, precautions to minimize embrittlement shall be exercised.
20.2 Corrosion-Resistant Corrosion-Resistant Steels Steels Unless otherwise specified, corrosion-resistant steel s cr cr ews ews s hall hall con con for for m t o t he he r equi equirr em em en en ts ts of ASTM F 738M.
20.3 Nonferrous Nonferrous Metals Metals Unless otherwise specified, nonferrous screws shall conform to the requirements of ASTM F 468M.
21 IDENTIFICA IDENTIFICATION TION SYMBOLS SYMBOLS Markings shall be raised or recessed on the top of the head or raised on the top of the flange unless otherwise specified by the purchaser. Markings shall be legible to the unaided eye with the exception of corrective lenses. When Whe n rai raised sed,, markin markings gs shall shall proje project ct not less less tha than n 0.1 mm
23 WORKMA WORKMANSH NSHIP IP Screws shall be free from surface imperfections such as bur burrs, rs, se seams ams,, laps, laps, loose loose scale, scale, and oth other er sur surfac facee irr irregegularities that could affect serviceability and shall con-
for for M14 M14 and and smal smalle lerr sc scre rews ws,, and and 0. 0.33 mm fo forr M16 M16 scre screws ws,, above the top surface of the head or flange; and total head height (head plus markings) shall not exceed the specified maximum head height, height, K maximum, maximum, plus 0.1 mm for M5 and M6 screws, 0.2 mm for M8 and M10 screws, 0.3 mm for M12 and M14 screws, and 0.4 mm for M16 screws.
form to ASTM F 788/F 788M unless otherwise stated.
24 INSPECTION INSPECTION AND QUALITY QUALITY ASSURANC ASSURANCEE Unless othe Unless otherwis rwisee spe specifie cified, d, acceptab acceptabilit ility y of screwss shall be determ screw determined ined in accordance accordance with ASME B18.18.4M except as required in section 25. 9
Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
ASME B18.2.5M-2009
25 DIMENSIONA DIMENSIONALL CO CONFORM NFORMANCE ANCE
26 CLEARA CLEARANCE NCE HOLES HOLES
Products shall conform to the specified dimensions. Unless otherwise specified, the following provisions shall sha ll apply apply for inspec inspection tion of dimens dimension ional al cha charac racter teristi istics: cs: Unless otherwise specified, the following desig(a) nated characteristics shall be inspected to the inspection levels shown according to ASME B18.18.2M, and shall be within specified limits.
The recommended sizes of clearance holes in material to be assembled using 12-point flange screws are the normal series given in ASME B18.2.8.
Characteristic Inspection
Level
Thread acceptability C Body diameter, D diameter, D s C Gaging of 12-point flange head C Grip length, L length, L g C Screw length, L length, L C Visual inspection [Note (1)] C NOTE: (1) Visual inspection shall include property class class marking, source marking, fillet, and workmanship.
(b) If a documented, verifiable, statistically based in-process inspection system is used by the fastener manufacturer, inspections may be conducted at any point after which that characteristic will not be altered. Inspection sample sizes and reporting shall be in accordance with recognized quality systems such as ASME, ASTM, and ISO. (c) For nondesignated characteristics, the provisions of ASME B18.18.1M shall apply.
27 DESIGN DESIGNAT ATION ION screws shall be designated by (a) Twelve-point flange screws the following data, preferably in the sequence shown: product name and designation of the standard, nominal diameter diame ter and thread thread pitch, nominal nominal length, length, steel property class or material identification, and protective coating, if required. EXAMPLES: (1) (1) 12-point flange screw ASME B18.2.5M, M10 1 .5 5 0, Property Class 12.9, ASTM A 574M. (2) 1212-poi point nt fla flange nge scr screw ew ASM ASME E B18 B18.2. .2.5M,M16 5M,M16 1 30, Prop Property erty Class A1-70, ASTM F 738M. NOTE: It is common NOTE: common practic practicee in ISO sta standa ndards rds to omit thre thread ad pitch from the nominal size designation when screw threads are the metric coarse thread series; e.g., M10 is M10 1.5.
(b) For a recommended part identifying number (PIN) system for B18 fasteners, see ASME B18.24, when defined.
o w n l o a d e d o n O c t 0 5 -2 0 1 0 y b S t a n f o r d
U n i v e r s i t y U s e r . N o f u r t h e r r e p r o d u c t i o n o r d i s t r i b u t i o n i s p e r m i t t e d . U n c o n t r o l l e d w
C o p y r i g h t e d m a t e r i a l l i c e n s e d t o S t a n f o r d U n i v e r s i t y b y T h o m s o n S c i e n t i f i c ( w w w . t e c h s t r e e t . c o m ) , d o w n l o a d e d o n O c t 0
-2 0 1 0 b y S
a t n f o r d U n i v e r s i t y U s e r . N o f u r t h e r r e p r o d u c t i o n o r d i s t b i r u t i o n i s p e r m
10 Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
i t t e d . U n c o n t r o l l e d w
C o p y r i g h t e d m a t e r i a l l i c e n s e
B18 AMERICAN NATIONAL STANDARDS FOR BOLTS, NUTS, RIVETS, SCREWS, WASHERS, AND SIMILAR FASTENERS
Small Solid Rivets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.1.1-1972 (R2006) Large Rivets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.1.2-1972 (R2006) Metric Small Small Solid Rivets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.1. .B18.1.3M-198 3M-1983 3 (R200 (R2006) 6) Square and Hex Bolts and Screws (Inch Series). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.1-1996 (R2005) Square Squar e and Hex Nuts (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.2-19 B18.2.2-1987 87 (R2005) Metric Hex Cap Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.1M-1999 (R2005) Metric Formed Hex Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.2M-2005 Metric Heavy Hex Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.3M B18.2.3.3M-1979 -1979 (R2001 (R2001)) Metric Hex Flange Screws. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.4M B18.2.3.4M-2001 -2001 (R2006 (R2006)) Metric Hex Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.5M B18.2.3.5M-1979 -1979 (R2006 (R2006)) Metric Heavy Hex Bolts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3.6M-1979 (R2006) Metric Heavy Hex Structural Structural Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2. B18.2.3.7M3.7M-1979 1979 (R2006) Metric Hex Lag Screws Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3 B18.2.3.8M-1 .8M-1981 981 (R2005) Metric Heavy Hex Flange Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.3 B18.2.3.9M-2 .9M-2001 001 (R2006) Square Head Bolts (Metric Series) Square Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2. B18.2.3.10M 3.10M-1996 -1996 (R2003 (R2003)) Metric Hex Nuts, Style 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2. B18.2.4.1M4.1M-2002 2002 (R2007) Metric Hex Nuts, Style 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2. B18.2.4.2M4.2M-2005 2005 Metric Slotted Slotted Hex Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.4.3M B18.2.4.3M-1979 -1979 (R2006 (R2006)) Metric Hex Flange Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.4 B18.2.4.4M-1 .4M-1982 982 (R2005) Metric Hex Jam Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.4.5M-2008 Metric Heavy Hex Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.4.6M-1979 (R2003) Metric 12-Point Flange Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.2.5M-2009 Fasteners Fast eners for Use in Structur Structural al Applications Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2. B18.2.6-2006 6-2006 Metric 12-Spline Flange Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.7.1M-2002 (R2007) Clearance Holes for Bolt, Screws, and Studs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2.8-1999 (R2005) Straightn Stra ightness ess Gage and Gaging Gaging for Bolts and Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2. B18.2.9-2007 9-2007 Socket Cap, Shoulder, and Set Screws, Hex and Spline Keys (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3-2003 (R2008) Socket Head Cap Screws (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3.1M-1986 (R2008) Metric Series Hexagon Keys and Bits. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3.2M-1979 (R2008) Hexagon Socket Head Shoulder Screws (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3.3M-1986 (R2008) Hexagon Socket Button Head Cap Screws (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3.4M-1986 (R2008) Hexagon Hexa gon Sock Socket et Flat Coun Countersu tersunk nk Head Cap Screws (Metric (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.3 B18.3.5M-19 .5M-1986 86 (R2008) Metric Series Series Soc Socket ket Set Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.3.6M .B18.3.6M-1986 -1986 (R2008 (R2008))
d t o S t a n f o r d
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Round Head Bolts (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.5-1990 (R2003) Metric Round Round Head Short Square Neck Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.5. B18.5.2.1M2.1M-2006 2006 Metric Round Round Head Square Neck Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.5.2. B18.5.2.2M-19 2M-1982 82 (R2005) Wood Woo d Screws Screws (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.6.1-1 B18.6.1-1981 981 (R2008) Slotted Slotte d Head Cap Screws, Square Head Set Screws, and Slott Slotted ed Headl Headless ess Set Screws Screws (Inch (Inch Series) Series) . . . . . . . . . . . . . . . B18.6.2-199 B18.6.2-1998 8 (R200 (R2005) 5) Machine Mach ine Screws and Machine Machine Screw Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.6. B18.6.3-2003 3-2003 (R200 (R2008) 8) Thread Thre ad Forming and Thread Thread Cutting Tapping Tapping Scre Screws ws and Metallic Drive Screws (Inch Series). . . . . . . . . . . . . . . . . . . . . . B18.6. B18.6.4-1998 4-1998 (R2005 (R2005)) Metric Thread-For Thread-Forming ming and Thre Thread-C ad-Cutting utting Tapping Tapping Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.6.5M.B18.6.5M-2000 2000 (R2005) Metric Machine Machine Screws . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.6.7M .B18.6.7M-1999 -1999 (R2005 (R2005)) General Gener al Purpose SemiSemi-Tub Tubular ular Rivets, Full Tubula Tubularr Rivets, Split Rivets and Rivet Caps Caps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.7B18.7-2007 2007 Metric General Purpose Semi-Tubular Rivets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.7.1M-2007 Clevis Clev is Pins and Cotter Pins (Inch Series). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.8.1-199 B18.8.1-1994 4 (R2000) Ta Taper per Pins, Dowel Pins, Straight Pins, Grooved Grooved Pins, and Sprin Spring g Pins (Inch (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.8. B18.8.2-2000 2-2000 Spring Pins: Coiled Type, Spring Pins: Slotted, Machine Dowel Pins: Hardened Ground, and Grooved Pins (Metric Series) Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.8. B18.8.100M100M-2000 2000 (R2005) Cotterr Pins Cotte Pins,, Head Headless less Clevis Clevis Pins Pins,, and Headed Clevi Cleviss Pins (Metri (Metricc Serie Series). s). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.8. B18.8.200M200M-2000 2000 (R2005) Plow Plow Bol Bolts ts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18 B18.9.9-200 2007 7 Track Track Bolts and Nuts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.10-198 .B18.10-1982 2 (R2005) Miniature Screws. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.11-1961 (R2005) Glossary Gloss ary of Te Terms rms for Mech Mechanica anicall Fasteners Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.12.B18.12-2001 2001 (R2006) Screw and Washer Assemblies — Sems (Inch Series). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.13-1996 (R2008) Screw and Washer Assemblies Assemblies:: Sems (Metric Series Series)) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.13 B18.13.1M-1 .1M-1998 998 (R2003) Forged Eyebolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.15-1985 (R2008)
Copyright c 2009 by the American Society of Mechanical Engineers. No reproduction may may be made of this material material without written written consent of ASME.
Metric Lifting Eyes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.1 B18.15M-199 5M-1998 8 (R2004) Prevailing-T Prevailing -Torque orque Typ Type e Steel Metric Hex Nuts and Hex Flange Flange Nuts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.16 B18.16M-200 M-2004 4 Serrated Hex Flange Locknuts 90,000 psi (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.16.4-2008 Nylon Insert Locknuts (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.16.6-2008 Inspection and Quality Assurance for General Purpose Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.18.1-2007 Inspection Inspe ction and Quality Quality Assuranc Assurance e for High-V High-Volume olume Machine Assem Assembly bly Fastener Fastenerss . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.18 B18.18.2M-1 .2M-1987 987 (R2005) Inspection Inspe ction and Quality Assurance Assurance for Special Purpos Purpose e Fasteners Fasteners . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.18 B18.18.3M-1 .3M-1987 987 (R2005) Inspection and Quality Assurance for Fasteners for Highly Specialized Engineered Applications . . . . . . . . . . . . . . . . B18.18.4M-1987 (R2005) Inspection Inspe ction and Quality Quality Assuranc Assurance e Plan Requiri Requiring ng In-Proces In-Processs Inspe Inspection ction and Cont Controls. rols. . . . . . . . . . . . . . . . . . . . . . . . . B18.18 B18.18.5M-1 .5M-1998 998 (R2003) Quality Quali ty Assuran Assurance ce Plan for Fast Fasteners eners Produc Produced ed in a Third Party Party Accredit Accreditation ation Syste System m . . . . . . . . . . . . . . . . . . . . . . . . B18.18 B18.18.6M-1 .6M-1998 998 (R2003) Quality Quali ty Assuran Assurance ce Plan for Fast Fasteners eners Produc Produced ed in a Customer Approved Approved Control Plan . . . . . . . . . . . . . . . . . . . . . . . . B18.18 B18.18.7M-1 .7M-1998 998 (R2003) Lock Washers (Inch Series). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.21.1-1999 (R2005) Lock Lock Washers (Metr (Metric ic Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.21 B18.21.2M-1 .2M-1999 999 (R2005) Double Doub le Coil Helic Helical al Spring Lock Washe Washers rs for Woo Wood d Structures Structures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.21 B18.21.3-20 .3-2008 08 Metric Plain Washers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.22M-1981 (R2005) Plain Washers Washers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.22.1 B18.22.1-1965 -1965 (R2008 (R2008)) Part Identifying Identifying Number (PIN) Code System for B18 Fast Fastener ener Product Productss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.2 B18.24-2004 4-2004 Square Squar e and Rectangular Rectangular Keys and Keyway Keyways. s. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.25 B18.25.1M-1 .1M-1996 996 (R2008) Woodruff Woo druff Keys and Keyway Keywayss . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.25 B18.25.2M-1 .2M-1996 996 (R2008) Square and Rectangular Keys and Keyways: Width Tolerances and Deviations Devia tions Greater Greater Than Basic Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.25 B18.25.3M-1 .3M-1998 998 (R2008) Tapered and Reduced Cross Section Retaining Rings (Inch Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.27-1998 (R2005) Helicall Coil Screw Thread Inserts — Free Running and Screw Locking Helica Locking (Inch Series). Series). . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.29.1B18.29.1-1993 1993 (R2007) Helicall Coil Screw Threa Helica Thread d Inser Inserts: ts: Free Runn Running ing and Screw Loc Locking king (Metric Series Series)) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.29.2M .B18.29.2M-2005 -2005 Open-End OpenEnd Blind Rivets With Break Mandrel Mandrelss (Metric Series) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.30 B18.30.1M-2 .1M-2000 000 (R2005) Metric Continuous Continuous and Double-En Double-End d Studs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B18.31.1M.B18.31.1M-2008 2008 Continuous and Double-End Studs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . B18.31.2-2008 The ASME Publications Catalog shows a complete list of all the Standards published by the Society. For a complimentary catalog, or the latest information about our publications, call 1-800-THE-ASME (1-800-843-2763).
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