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GB/T 1184-1996Geometrical tolerancing. Geometrical tolerance for features without individual tolerance indications (English PDF)

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Issued by

China State Bureau of Technical Supervision

Level / Type

National · Recommended

Issue date

December 18, 1996

Implementation date

July 1, 1997

Scope

GB/T 1184-1996 (Geometrical tolerancing. Geometrical tolerance for features without individual tolerance indications) is available as an English-translated PDF.

GB/T 1184-1996 - This Standard mainly applies to features which are produced by removal of material.

Its application to features manufactured by other processes is possible; however, special examination is required to ascertain whether the customary workshop accuracy lies within the without individual tolerance indications specified in this Standard.

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Document preview — GB/T 1184-1996

National Standard of the People's Republic of China

Issued by: China State Bureau of Technical Supervision

Foreword...3
ISO Foreword...4
1 Scope...5
2 Normative references...5
3 Definitions...5
4 General...5
5 Without individual tolerance indication...6
6 Indications on drawings...8
7 Noted tolerance...9
8 Rejection...9

Foreword

This Standard is an amendment of GB 1184-80 Geometrical tolerance --

Geometrical tolerance for features without individual tolerance indications,

according to international standard ISO 2768-2.1989 General geometrical

tolerance - Part II. Geometrical tolerances for features without individual

tolerance indications. This Standard is equivalent to ISO 2768-2 technically.

This Standard is equivalent to ISO 2768-2, and at the same time, keeps the

stipulation of GB 1184 about noted tolerance value considering the

practicability of the standard as annex B; it is combining two annexes of ISO

2768-2 as one annex A.

Compared with the year-1980 standard, this Standard has significant

difference. all the listed items without individual tolerance indications,

classification of the tolerance grade AND tolerance for features without

individual tolerance indications are conforming to ISO 2768-2; so it is

completely different to the previous GB 1184-80 value system.

This Standard mainly contains definition, geometrical tolerance -- geometrical

tolerance for features without individual tolerance indications, indications on

drawings, tolerance for features without individual tolerance indications in

special occasions AND geometrical tolerance with individual tolerance

indication.

This Standard shall be implemented from July 01, 1997, at the same time, it

replaces GB 1184-80.

The Annex A and Annex B are for information only.

This Standard was proposed by Ministry of Machinery Industry of P. R. China.

This Standard shall be under the jurisdiction of National Tolerance and Fits

Standardization Technical Commission.

Drafting organization of this Standard. Mechanical Standardization Institute of

Ministry of Machinery Industry of P. R. China.

Drafters of this Standard. Zhou Zhong and Wang Kai.

ISO Foreword

ISO (the International Organization for Standardization) is a worldwide

federation of national standards bodies (ISO member bodies). The work of

preparing International Standards is normally carried out through ISO technical

committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that

committee. International organizations, govern-mental and non-governmental,

in liaison with ISO, also take part in the work. ISO collaborates closely with the

International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

Draft International Standards adopted by the technical committees are

circulated to the member bodies for approval before their acceptance as

International Standards by the ISO Council. They are approved in accordance

with ISO procedures requiring at least 75 % approval by the member bodies

voting.

International Standard ISO 2768-2 was drafted by Technical Committee

ISO/TC 3, Limits and fits.

This first edition of ISO 2768-2, together with ISO 2768-1, cancels and

replaces ISO 2768.1973.

ISO 2768 consists of the following parts, under the general title General

tolerances.

- Part 1.Tolerances for linear and angular dimensions without individual

tolerance indications

- Part 2.Geometrical tolerances for features without individual tolerance

indications

Annexes A and B of this Standard of ISO 2768 are for information only.

National Standard of the People's Republic of China

Geometrical tolerancing - Geometrical tolerance GB/T 1184-1996

for features without individual tolerance indication eqv ISO 2768-2.1989

Replacing GB 1184-80

1 Scope

This Standard mainly applies to features which are produced by removal of

material. Its application to features manufactured by other processes is

possible; however, special examination is required to ascertain whether the

customary workshop accuracy lies within the without individual tolerance

indications specified in this Standard.

2 Normative references

The following standards contain the provisions which, through the reference in

this text, constitute the provisions of this Standard. At the time of publication,

the editions indicated were valid. All standards are subject to revision, and

parties to agreements based on this Standard are encouraged to investigate

the possibility of applying the most recent editions of the standards indicated

below.

GB/T 1182-1996 Geometrical tolerancing - Generalities, definitions, symbols,

indications on drawings

GB/T 1804-92 General tolerances - Tolerances for linear dimensions without

individual tolerance indications

GB/T 4249-1996 Tolerancing principle

3 Definitions

For the purposes of this Standard, the definitions for geometrical tolerances

given in GB/T 1182 apply.

4 General

When selecting the tolerance class, the respective customary workshop

accuracy has to be taken into consideration. If smaller geometrical tolerances

are required or larger geometrical tolerances are permissible and more

economical for any individual feature, such tolerances should be indicated

directly in accordance with GB/T 1182.

5 Without individual tolerance indication

5.1 Geometrical tolerances for features without individual tolerance indications

5.1.1 Straightness and flatness

The without individual tolerance indications on straightness and flatness are

given in Table 1.When a tolerance is selected from Table 1, it shall be based,

in the case of straightness, on the length of the corresponding line and, in the

case of flatness, on the longer lateral length of the surface, or the diameter of

the circular surface.

5.1.2 Circularity

The without individual tolerance indications on circularity are equal to the

numerical value of the diameter tolerance, but in no case shall it be greater

than the respective tolerance value for circular radial run-out given in Table 4

(see figure A.2 in Annex A (for reference)).

5.1.3 Cylindricity

The without individual tolerance indications on cylindricity are not specified.

5.2 Without individual tolerance indications of geometric tolerance

5.2.1 Parallelism

The without individual tolerance indication on parallelism is equal to the

numerical value of the size tolerance or the flatness/straightness tolerance,

whichever is the greater.

5.2.2 Perpendicularity

The without individual tolerance indications on perpendicularity are given in

Table 2.The longer of the two sides forming the right angle shall be taken as

the datum; if the sides are of equal nominal length, either may be taken as the

datum.

5.2.3 Symmetry

The without individual tolerance indications on symmetry are given in Table 3.

The longer of the two features shall be taken as the datum; if the features are

of equal nominal length, either may be taken as the datum.

5.2.4 Coaxiality

Without individual tolerance indications on coaxiality are not specified.

Coaxiality tolerance can be equal to the radial circular run out tolerance

stipulated in Table 4 at limit conditions. Select the longer one as reference from

these two features; if the length of these two features are same, select anyone

as reference.

5.2.5 Circular run-out

The without individual tolerance indications on circular run-out (radial, axial

and any surface of revolution) are given in Table 4.

Annex A

(informative)

Concepts and explanation of geometrical tolerancing feature

without individual tolerance indications

A.1 Concepts and marking behind without individual tolerance indications of

geometrical tolerance

The unnoted tolerance which conform to factory normal accuracy grade need

not marked on the drawing; some feature required by the function reason

smaller than "unnoted tolerance" is not belonging to the unnoted tolerance

category, it should be noted according to the stipulation of GB/T 1182; If the

function requirements allows the tolerance bigger than unnoted tolerance, and

this bigger tolerance can bring economic benefit to the factory, this bigger

geometrical tolerance should be noted on the feature separately. For example,

metal thin wall part, flexible material part (like rubber part and plastic part) etc.

A.2 Above a certain tolerance value, which corresponds to the customary

workshop accuracy, there is usually no gain in manufacturing economy by

enlarging the tolerance.

A.3 Using without individual tolerance indications leads to the following

advantages.

A.4 The workshop should, therefore,

A.5 Rejection

The tolerance the function allows is often greater than the without individual

tolerance indication. The function of the part is, therefore, not always impaired

when the without individual tolerance indication is (occasionally) exceeded at

any feature of the work piece. Exceeding the without individual tolerance

indication should lead to a rejection of the work piece only if the function is

impaired.

A.6 Application range of geometrical tolerance unnoted tolerance

Unnoted tolerance of geometrical tolerance is applicable to the part feature

which is abide by independent principle; to some part features abide by

envelope principle requirement and to some features with maximum material

dimension anywhere(see example in figure A1).

A7 Example of roundness unnoted tolerance

Example please see Figure A2.

Example 1, circle feature diameter tolerance is noted 25 0 1.0-, roundness

unnoted tolerance is 0.1.

Example 2, circle feature diameter adopts unnoted tolerance, which is conform

to GB/T 1804 m grade.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 9 pages — is available in the English PDF.

Referenced standards

Normative references

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