ISO 6411-1982 Simplified Representation of Centre Holes

International Standard INTERNATIONAL

ORGANIZATION

FOR STANDARDIZATlON.ME~YHAPO~HAR

Technical drawings centre holes Dessins techniques - Reprksentation

First edition

z

UDC

-

-

OPTAHM3AUMR

llD CTAH&WTbl3AUWWORGANlSATlON

Simplified

INTERNATIONALE

representation

DE NORMALISATION

of

simplifitSe des trous de’centre

1992-04-15

744.4

Descriptors

0

@ 6411 4iY!!

: engineering drawings,

ii

Ref. No. centre holes,

graphic methods,

generalities,

designation.

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i2

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IS0 5411-1992 (E)

Price hased on 5 pages Not for Resale

Foreword IS0 (the International Organization for Standardization) is a worldwide federation of national standards institutes (IS0 member bodies). The work of developing International Standards is carried out through IS0 technical committees. Every member hody interested in a subject for which a technical committee has been set up has the right to he represented on that committee. international organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft International Standards adopted the member bodies for approval hefore the IS0 Council. International

Standard

by the technical their acceptance

committees are circulated as international Standards

to by

IS0 8411 was developed by Technical Committee ISO/TC to the member hodies in January 1980.

10,

Technical drawings, and was circulated It has been approved

hy the memher

hodies

of the following

countries

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France Germany, F. R. India Italy Japan Korea, Dem. P. Rep. of Korea, Rep. of Mexico Norway

Australia Austria Belgium Brazil Canada China Czechoslovakia Denmark Finland

The memher hody of the following technical grounds :

country

expressed

disapproval

:

Poland Romania South Africa, Rep. of Spain Sweden Switzerland United Kingdom USA USSR of the document

Netherlands

0

International

Organization

for Standardization,

1982

e

Printed in Switzerland

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Not for Resale

on

IS0 6411-1982 (E)

STANDARD

Technical drawings centre holes

1

Scope

and field

-

Simplified

representation

This International Standard specifies the simplified tation of centre holes and their designation. representation of centre holes may he used particularly is not necessary to show the exact form and size and designation of standardized centre holes is sufficient mation.

represenSimplified when it where the for infor-

IS0 6428, Technical copying. 1)

3 2

of

Technical drawings IS0 3098/l, Currently used characters.

of application

Indication

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INTERNATIONAL

drawings

-

-

Lettering

-

Requirements

Part 1 :

for micro-

on drawings

References 3.1

IS0 128, Technical drawings

-

General principles

Requirements

of presen-

tation. IS0 866, Centre drills for centre holes without chamfers - Type A.

protecting

IS0 2540, Centre drills for chamfers - Type 8.

protecting

Generally, three different requirements technical drawings for the form and namely : a)

centre

holes

with

centre

hole is required

may be defined on size of centre holes,

on the finished

b) centre hole can be accepted not a fundamental requirement;

part;

on the finished

part, but is

IS0 2541, Centre drills for centre holes with radius form c)

Type R.

1)

At present at the stage of draft.

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centre

hole shall not exist on the finished

part.

3.2

(E)

Simplified

representation

-

The symbols representing centre holes and their application the end face of a shaft are shown in column 2 of table 1.

3.3

Designation

of centre

to

the outside

The two values

holes

IS0

of the centre

hole itself

consists

-

a reference

-

the letter for the type (R, A or B);

-

the pilot diameter

to this International

of

are separated

D.

by a solidus.

4

6411-B

2,5/8

Interpretation

of indication

Standard;

Further details specifying the dimensions be indicated preferably on the drawings,

1 -

hole diameter

The relationship between the various designations used to specify the centre holes, the dimensions represented by the given designations, and dimensions depending on the centre drill used are shown in table 2.

d;

Table

centre

Example : a centre holel), type B with d = 2,5 mm and D, = 8 mm may be indicated on the drawing as :

The designation of centre holes is dependent on the drill and may be indicated with reference either to an International Standard or to any other standard dealing with this subject. The designation

countersink

Representation

and designation

of centre

holes

of the centre hole, to are given in annex A.

on drawings Dimensions in millimetres

Requirement

Designation

Representation

Centre hole is required on the finished part

m

r)SO

Centre hole may remain on the finished part

Centre hole shall not exist on the finished part

1)

For the machining of such a centre hole, a drill with d = 2.5 and dl = 10 according to IS0 2540 is used.

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2

Not for Resale

6411-B2,5/8

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IS0 6411-1982

IS0 6411-1982(E)

Table

2 -

Interpretation

of the designation Dimensions in millimetres

Type of centre hole

Designation

Interpretation

(examples)

of the designation

R with

radius form .~.

IS0 6411-R 3,15/6,7

IFI+ centre

drill according IS0 2541)

to

d = 3,15 D,= 6,7

A

_~-

without protecting chamfer

IS0 6411-A 4/8,5

t drill according

to --`,,`,-`-`,,`,,`,`,,`---

centre

IS0 886)

d=4 LIZ=8,s

B with protecting

chamfer _~_

IS0 6411- B2,5/8

I

centre

drill according

to

IS0 2540)

d=2,5 4=8 I

rur ulmenalon I, see annex A.

‘*

Dimension I depends on the length of the centre drill. It should not he less than

Copyright International Organization for Standardization Provided by IHS under license with ISO No reproduction or networking permitted without license from IHS

t.

3 Not for Resale

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IS0 6411-1982

(El

Annex Dimensions

The dimensions

which

are necessary

to specify

Table

for centre

a centre

3 -

A holes type

hole are shown

Dimensions

R, A and B

in table 3.

of preferred

centre

holes Dimensions in millimetres

Type

d

nom.

to,51 10.63) (0.8) 1.0 (1,25)

116 zo 2,s 3.15 4.0 (5.0)

6.3 (8,O) 10.0

A according to IS0 866

R according to IS0 2541 Dl nom.

nom.

2.12 2,65 3,35 4,25 5.3 6.7 8.5 10.6 13,2 17,o 21.2

1,06 I,32 1.70 2.12 2,65 3.35 4,25 5.30 6.70 8.50 10.60 13,20 17,oo 21,20

4

NOTE - Sizes in brackets should be avoided whenever

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B according to IS0 2540

t

03

ref.

nom.

ref.

3,15 4 5 6.3 8 10 12,5 16 18 2284 28

0.9 1.1 t,4

t

0.5

0.6 0.7 0.9 1,’ 1,4

1.8 2.2 2.8 3.5 4,4 5,5 7,O 8.7

possible.

Not for Resale

1,8 22 2.8 3,5 4,4 5.5 7,O 8,7

IS0 6411-1982 (EI

Annex Proportions

B

and dimensions

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B.2

of symbols

Proportions

In order to harmonize the sizes of the symbols specified in this International Standard with those of the other inscriptions on the drawing (dimensions, tolerances, etc.) the following rules shall he ohserved.

The symbol and its complements shown in area a (see 8.3) shall be drawn in accordance with the figure.

B.l

B.3

General

requirements

B.l .l The symbols shown in the table shall he inscribed with a line thickness Id’ j equal to 1 /lO of the height (h) of the lettering used for the dimensions in the relevant drawing.

Dimensions

The range of sizes to he used for the symbols indications is given in table 4. Table

4 -

Dimensions,

and additional

in millimetres

B.1.2 The numerals and capital letters used for the additional specifications of centre holes shall he inscribed with the same line thickness (d), height (h) and type of lettering as used for the dimensions in the relevant drawing, and in accordance with IS0 3098/l. B.1.3 The minimum spacing between adjacent in accordance with IS0 128 or IS0 8428. It is recommended

that this spacing

lines shall he

he not less than 0,7 mm.

Figure

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