IS 2102 ( Part 1 ,) : 1993

2768-l : 1989

IS0

( Reaffirmed 2003 )

UDC

6217531

: 7444

@ BIS 1993

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STANDARDS
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IS 2102 ( Part 1) : 1993

IS0 2768-l : 1989

Indian Standard
GENERAL
PART

TOLERANCES
FOR LINEAR AND ANGULAR
DIMENSIONS
INDIVIDUAL
TOLERANCE
INDICATIONS
(

TOLERANCES
WITHOUT

Third Revision )

Scope

This part of IS0 2758 is intended to simplify drawing indications and it specifies general tolerances for linear and angular
dimensions without individual tolerance indications in four tolerance classes.
NOTE 1 - The conceptsbehind the generaltolerancingof linearand
angulardimensionsare describedin annex A.

General

When selecting the tolerance class, the respective customary

workshop accuracy has to be taken into consideration. If smaller tolerances are required or larger tolerances are permissible
and more economical for any individual feature, such tolerances should be indicated adjacent to the relevant nominal dimension(s).

3 Parallel International Standards exist or are planned, e.g. see

IS0 60621)for castings.

General tolerances for .linear and angular dimensions apply

when drawings or associated specifications refer to this part of
IS0 2768 in accordance with clauses 4 and 5. If there are general tolerances for other processes, as specified in other International Standards, reference shall be made to them on the
drawings or associated specifications. For a dimension
between an unfinished and a finished surface, e.g. of cast or
forged parts, for which no individual tolerance is directly indicated, the larger of the two general tolerances in question
applies, e.g. for castings, see IS0 806211.

This part of IS0 2758 only applies for the following dimensions
which do not have an individual tolerance indication :

It applies to the dimensions of parts that are produced by metal

removal or parts that are formed from sheet metal.
NOTES
2 Thesetolerancesmay be suitablefor use with materialsother than
metal.

a) linear dimensions (e.g. external sizes, internal sizes,

step sizes, diameters, radii, distances, external radii and
chamfer heights for broken edges);
b) angular dimensions, including angular dimensions
usually not indicated, e.g. right angles BOoI, unless reference to IS0 2768-2 is made, or angles of uniform pclygons;
cl linear and angular dimensions produced by machining
assembled parts.
It does not apply for the following dimensions :

IS0 2758-Z : 1989. General tolerances

tolerances

without

individual

IS0 8015 : 1985, Technical drawings

b)

4.1

1) IS0 8062 : 1904, Castings - System of dimensional tolerances.

for features

Part 2:

Geometrical

tolerance indications.
Fundamental

toleran-

cing principle.

c) theoretically exact dimensions indicated in rectangular

frames.

references

The following standards contain provisions which, through

reference in this text, constitute provisions of this part of
IS0 2768. At the time of publication, the editions indicated
were valid. All standards are subject to revision, and parties to
agreements based on this part of IS0 2768 are encouraged to
investigate the possibility of applying the most recent editions
of the standards indicated below. Members of IEC and IS0
maintain registers of currently valid International Standards.

a) linear and angular dimensions which are covered by

reference to other standards on general tolerances;
auxiliary dimensions indicated in brackets;

Normative

General tolerances
Linear dimensions

General tolerances for linear dimensions are given in tables 1

and 2.

IS 2102

( Part 1) : 1993

: 1969

IS0

2766-l

4.2

Angular

General

a)

IS0

2768;

only the

b)

the

tolerance

but not

IS0

2768.

dimensions

tolerances

specified

general orientation

in angular

units control

of lines or line elements

of surfaces,

class

in accordance

with

this

exceeding

the

part

of

their form deviations.

EXAMPLE
The general orientation
face is the orientation

of the line derived from the actual sur-

of the contacting

form. The maximum

distance

between

line of ideal geometrical

the contacting

the actual line shall be the least possible value (see IS0
The permissible

deviations

of angular

dimensions

IS0

2768-m

line and
8015).

are given in

table 3.

Rejection

Unless

Indications

otherwise

tolerance

on drawings

ability
If general tolerances

in accordance

shall apply, the following

near the title block :

with this part of IS0

information

Table 1 -

2768

shall be indicated

Permissible

workpieces

of

the

workpiece

to

rejection

function

general

provided that the

is not

impaired

(see

clause A.4).

in or

deviations

(external

stated,

shall not lead to automatic

for linear dimensions

radii and chamfer

heights,

except for broken edges

see table 2)
Values in millimetres

Tolerance

Permissible

class
n c11

over

over

deviations

for basic size range

over

over

over

over

over

Description

Designation

I
36

126

400

loo0

2066

46cm

fine

i 0,05

k 0,05

f0.1

kO.15

f 0,2

*0,3

kO.5

medium

f0.1

fO,l

f 0,2

+0,3

kO.5

f0.8

-L 1,2

*2

coarse

+_0,2

+ 0.3

+0,5

kO.8

+1,2

f2

+3

+4

f0,5

kl

+1,5

f2,5

f4

+6

+_8

1)

very

coarse

For nominal sizes below 0.5 mm, the deviations shall be indicated adjacent to the relevant nominal size(s).

Table 2 -

Permissible

deviations

for broken edges (external

radii and chamfer

heights)

Values in millimetres
Tolerance
Designation
f

---__

m
_~
-___.

class

Permissible

Description

0.5

/ fine
I
/ medium

coarse

very

deviations

up to 3

over 3

for basic size range

up to 6

over 6

* 0,2

+0,5

fl

f 0,4

+1

+2

coarse

1) For nominal sizes below 0,5 mm, the deviations shall be indicated adjacent to the relevant nominal size(s).

Table 3 Tolerance
Designation

Description
fine

medium

~____

coarse
-.very coarse

deviations

Permissible

class

Permissible

of angular dimensions

deviations

for ranges of lengths,

in millimetres,

of the shorter side of the angle concerned

up to 10

over 10 up to 56

f10

+ 0030

-__+ 30

220

over 56 up to 120 over 120 up to 406

over 4lXl

+ 0020

+ 0010

+ 005

It 090

kOO15

ltOOl0

k OY?O

f 0020

+1o

IS 2102 ( Part 1) : 1993

IS0 2768-l : 1989

Annex A
(informative)
Concepts

A.1
by

General
reference

behind

tolerances
to

this

general

tolerancing

should be indicated

part

of

IS0 2768

of linear and angular

c)

on the drawing

in accordance

values

classes

of

tolerance
cording

readily indicates which feature

by normal

of

general

tolerances

customary

correspond

workshop

accuracy,

class being selected and indicated

to the requirement

to

the

tolerance

d)

appropriate

on the drawing

ac-

those dimensions

ling features

for the components.

tolerances

capability,

by reducing

dicated tolerances,

inspection

remaining,

Above

certain tolerance

in manufacturing
example,
tured

economy

a feature

to a high

customary
general

the

having a 35 mm diameter
level

medium

k 1 mm would

values, there is usually no gain

by enlarging

of conformance
accuracy.

be of no benefit

tolerance

values

tolerance.

for which the function

could be manufac-

Specifying
*0,3

mm

e)

if, for functional

have the smaller

than

should not be indicated

be stated on the drawing

tolerance

sub-contract

of

workshop

as

this also avoids arguments

be quite

then that feature

indicated

individually

its size or angle.

the

of a feature
general

adja-

This type of

adjacent

allows

tolerance

a tolerance

values,

to the dimension

as described

orders

more

accuracy

and the supplier,

readily

allows

is known before the contract

on delivery

than the general

will provide

manufacturing

individually adjacent

to the dimension

of the

the buyer
is com-

are fully
that the

obtained
only when there is
general tolerances will not be

i.e. when
workshop

the customary workshop accuracy of the

is equal to or finer than the general

tolerances

indicated

in the drawing.

The workshop

should,

therefore

find

out

workshop

by

accuracy

measurements

accept

only those drawings

equal to or greater

its

customary

having general

than its customary

economy.

should be indicated

tolerances

workshop

accuracy;

check by sampling

that its customary

workshop

accu-

racy does not deteriorate.

for the particular feature,

Relying on undefined

good

workmanship

tainties and misunderstandings

concept
Using general tolerances

what

is;

tolerances,

e.g. the depth of blind holes drilled at assembly.

leads to the following

advan-

of

geometrical

general
tolerances

geometrical
define

with all its uncer-

is no longer necessary with the

tolerances.

the required

The

accuracy

general
of good

workmanship.
drawings

are easier to read and thus communication

made more effective

is

A.4

to the user of the drawing;

The tolerance

the general tolerance.

b)

is placed;

between

of general tolerancing.

In these special cases, the larger tolerance

a)

can

customary

exceeded,
particular

but should

to the rule where the function

a larger tolerance

and the larger tolerance

tages

engineers
the

since in this respect the drawing

These advantages
sufficient
reliability

A.3

supply
since

these

in clause 5. This type of

allows full use of the concept

There will be exceptions

feature

and

workshop,

requires a smaller

tolerances,

defining

the function

to or larger

tolerance

purchase

a tolerance

falls outside the scope of general tolerances.

In cases where
equal

reasons, a feature

value than the general

cent to the dimension

tolerance

plan-

services in their analysis

plete.

However,
should

requires relatively small

requirements;

negotiate

adequate.

tolerance

in-

may require special effort in

this will be helpful for production

with

would

assists

levels;

For

in a workshop

in this particular
of

of inspection

also

which have individually

ning and will assist quality control

A.2

can be pro-

which

will, for the most pat-t, be those control-

and which therefore

the production

the

process

quality engineering

clause 5.
The

the drawing

duced

with

dimensions

the

design

tailed tolerance
that the function

draughtsman
calculations

saves

by avoiding

as it is sufficient

allows a tolerance

the general tolerance;

time

de-

only to know

greater than or equal to

the function

allows is often greater

The function

of the part is, therefore,

always impaired when the general tolerance

exceeded
at any feature of the workpiece.
general

tolerance

should

only if the function

lead to a rejection

than
not

is ioccasiorlallv)
Exceeding
the
of the workpiece

is impaired.

Rrprogr*phy

Unit,

BIS,

New

Dclbi,

India

Bureau of Indian Standards

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harmonious development of the activities of standardization, markingand quality certifidation of goods and
attending to connected matters in the country.
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implementing the standard, of necessary details, such as symbols and sizes, type or grade designations.
Enquiries relating to copyright be addressed to the Director (Publication), BIS.
Review of Indian Standards

Amendments are issued to standards as the need arises on the, basis of comments. Standards are also reviewed
periodically; a standard along with amendments is reaffirmed when such review indicates tIi+ no changes are
needed; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standards
should ascertain that they are in possession of the latest amendments or edition by referring to the latest issue
of BIS Handbook and Standards Monthly Additions.
This Indian Standard has been developed from Dot: No. LMD 01 ( 0126 )
Amendme&

Amend No.

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Publication

Date of Issue

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