ISO 6411 Centre Hole

इंटरनेट

मानक

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“The Right to Information, The Right to Live”

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Jawaharlal Nehru

IS 11668 (1985): Technical drawings - Simplified representation of centre holes [PGD 24: Drawings]

“!ान $ एक न' भारत का +नम-ण” Satyanarayan Gangaram Pitroda

“Invent a New India Using Knowledge”

“!ान एक ऐसा खजाना > जो कभी च0राया नहB जा सकता ह” है” ह Bhartṛhari—Nītiśatakam

“Knowledge is such a treasure which cannot be stolen”

UDC

744’43

: 621 - 229’335

IS : 11668 - 1985 IS0 6411 - 1982

: 003.62

Indian

Is1 I

1

( Reaffirmed 2005 )

Standard

TECHNICAL DRAWINGS - SIMPLIFIED REPRESENTATION OF CENTRE HOLES

I

._C.. ..p_ National

Foreword

This Indian Standard is identical with IS0 641 I-1982 ’ Technical drawings - Srmplified ‘epresentation of centre holes ’ issued by the International Organization for Standardization ( IS0 I, was adopted by the Indian Standards Institution on the recommendation of the Drawings Sectional Committee and approvafof the Mechanical Engineering Division Council. In the adopted II? Indian Standard;

standard attention

certain terminology is especially drawn

Wherever the words ’ International read as ’ Indian Standard ‘. The reference Cross

Standard

of ISO’ 6,411 indicated

and conventions to the following:

’ appear,

in designation

referring

should

are

not

to

this

identical

with

standard,

those

they

be read as IS : 11668

used

should

- IS0

be

6411.

References international

Adopted

Corresponding

Standard

Indian

Standard

IS : 10714-1983 General ~principles ation on technical drawings ( Identical )

present-

128-l

IS0

866.1975

IS : 6708.1977 Specification Type A ( first revision ) (Technically equivalent)

for

centre

drills

IS0

2540-l 972

IS : 67091977 Specification Type l3 ( first revision ) ( Technically equivalent )

for

centre

drills

IS0

2541-l 972

IS : 6710-1977 Specification Type R ( first revisiorl ) (Technically Equivalent i

for

centre

drills

IS0

3098 l-1974

IS : 9609 ( Part 1 )-1983 Lettering on technical Part 1 English lettering ( firsi drawings: revision ) ( Identical )

IS0

6428-l

lS : 101641985 cal drawings ( Identical )

1 November

982

of

IS0

982

@

1985 ._.-

I

.._.

--._.-_--^

March

1987,

to execute techni( first revision )

Gr

ISI

._.^_._.._.^_.

INDIAN SIANUAi+US INS MANAK BHAVAN, 9 BAHADUR SHAH NEW DELHI 110002

Requirements for microcopying

I

U I ILJN ZAFAR MARG

I II

3

IS : 11668 - 1985 IS0 6411 - 1982

1

Scope and field of application

IS0 309811, Current&

This International tation

of

centre

representation

Standard holes

specifies and

the simplified

their

designation.

Technical

drawings

-

Lettering

-

Part 1

:

used characters.

represenIS0 6428,

Simplified

of centre holes may be used particularly

Technical

drawings

-

Requirements

for micro-

1)

copying.

when it

is not necessary to show the exact form and size and where the designation

of standardized

centre holes is sufficient

for infor-

mation.

3 2

References

IS0

128, Technical

Indication on drawings

3.1 Requirements drawings

-

~General principles

of presenGenerally,

tation.

technical IS0 866,

Centre

chamfers

-

IS0

2540,

chamfers

for

centre

holes

without

protecting

namely

different

2541,

drills

for

centre

holes

with

form

and

may

be defined

size of centre

on

holes,

a)

centre hole is required on the finished part;

b)

centre hole can be accepted

protecting

Type 6. Centre

drik

for centre

holes with

on the finished part, but is

requirement;

radius form c)

Type R.

1)

requirements

:

not a fundamental IS0

for the

Type A. Centre

-

drills

three

drawings

At present at the stage of draft.

a

centre hole shall not exist on the finished part.

IS :11668-1985 IS0 6411 -1982

3.2

Simplified

-.

representation

The symbols representing

centre holes and their application

to

the outside countersink

The two values are separated

centre hole diameter

D.

by a solidus.

the end face of a shaft are shown in column 2 of table 1. Example

3.3

Designation

: a centre holet), type B with d = 2.5 mm and

D3 = 8 mm may be indicated

of centre holes

on the drawing

as :

IS0 8411-B 2,5/8 The designation

of centre~holes

is dependent

on the drill and

may be indicated with refarence either to an International

Stan-

dard or to any other standard dealing with this subject.

4

The desrgnation

The

of the centre hole itself consists of

Interpretation relationship

between

specify the centre -

a reference

-

the letter for the type (I% A or 6);

-

the prlot arameter d;

to this International

Standard;

given designations, drill used are shown

Table 1 -

Representation

of vindication the various

designations

holes, the dimensions and dimensions

represented

depending

used to by the

on the centre

in table 2.

Further details specifying the dimensions

of the centre hole, to

be indicated preferably

are given in annex A

and designation

on the drawings,

of centre holes on drawings Dimensions in millrmetres

Requirement

Repreeentatian

Designation

Centre hole is required on the rinished part

Centre hole may remain on the finished part

Centre hde shatl not exisf on the

3 SO 6411-B2.51'1

.___-

finished part

II

For the machining of such a centre hole, a drill with d = 2,5 and d, = 10 according to IS0 2540 is used.

3

IS :I1668 -1985 IS0 6411 - 1982

Table

2 -

interpretation

of the

designation Dimensions in milllmetres

I

Type of centre hole

D_esignation (examples)

Interpretation

of the designation

R with radius form

IS0 6411-R 3.lV6.7

entre drill according

to

IS0 2541)

d = 3.15 D,= 6.7 i _

_~.

A without

6411-A 418.5

protecting

chamfer

centre drill according

t* L-4

tl

d=4 D2= 8.5

_~.

6 with protecting

chamft

6411- 82,5/8

(centre

drill according IS0

2540)

c/=2,5 4=8 l

l

For dimension *

Dimension

L I**

IS0 866)

I, see annex A

I depends

on the length of the centre drill. It should not he less than i

4

IS : 11668 - 1985 IS0 6411 - 1982

Annex Dimensions

The dimensions

for centre

A

holes type R, A and B

which are necessary to specify a centre hole are shown

Table

3 -

Dimensions

in table 3

of preferred

centre

holes

Tvw d nom.

A

R according to IS0 2641 DI

B accordtnq to IS0 2540

according to IS0 866 I

4

nom.

ref

10,5)

1.06

0.5

(0,631

1.32

(0.8)

1.70

nom.

r* “0”)

i ref

06

t

0.7

2.12

2.12

0.9

3 15

0.9

2.65

2~65

l,l

4

1.1

1.6

3.35

3.35

1.4

5

14

2,o

4.25

4,25

1.8

6.3

1.8

2.5

5.3

5.30

2.2

8

2.2

3.15

6.7

6,70

2.8

10

2.8

4.0

8.5

8.50

3.5

12.5

35

(5 0)

10.6

10.60

4.4

16

1.0 (1.25)

6.3

13.2

13.20

55

18

(8.01

17.0

17,00

7.0

224

10.0

21.2

21.20

a.7

28

NOTE -

Sizes in brackets should be avoided whenever possible.

1

I

IS : 11668 - 1985 IS0 6411 - 1982

.

Annex Proportions

In order to harmonize International

General

B.l.1

tolerances,

etc.) the following

B.2

in thiq

with those of the other inscriptions

the drawing (dimensions, shall he ohserved.

B.l

and dimensions

the sizes of the symbols specified

Standard

rules

Proportions

The symhol

and its complements

shall he drawn

requirements

(d’

af symbols

on

B.3

The symbols shown in the table shall he inscribed with

a line thickness

B

in the relevant

indications

is given in tahle 4.

drawing.

of centre holes shall be inscribed

line thickness

(~‘1, height

the dimensions

(h) and type of lettering

in the relevant drawing,

Line thickness for outlines of an item Ih)

with the same

in millimetres

The minimum

in accordance

with IS0

It is recommended

spacing

and in accordance

hetween

128 or IS0

that this spacing

adjacent

0.5

0.7

1

3.5

5

7

0.35

0.5

0.7

1.4

2

2.8

as us&d for Height of_numerals and capital letters (h) Line thickness for symbols (d’ ) ______~_ Line thickness for lettering (d)

with

309811.

B.1.3

Dimensions,

The numerals and capital letters used for the additional

specifications

IS0

in area a (see 8.3)

Dimensions

Table 4 B.1.2

shown

with the figure.

The range of sizes to he used for the symbols and additional

) equal to 1 /lO of the height (h) of the letter-

ing used for the dimensions

in accordance

lines shall be

6428.

Height H1

he not less than 0.7 mm.

10 1

14

20

1.4

2

see 8.1.2 5

7

10

14

20

28

Figure

Reprography Unit, ISI, New Delhi, India 6