GB/T 1957-2006Tolerances and general features for plain limit gauges (English PDF)

Foreword

This Standard replaces GB/T 1957-1981 Tolerances and general features for plain limit

gauges.

Compared with GB/T 1957-1981, the main changes of this Standard are as follows.

- Change the format according to GB/T1.1-2000;

- Change the standard's name;

- Add terms and definitions used in this Standard (section 3 of this edition);

- Add description of the symbols used in this Standard (section 4 of this edition);

- Change the hardness of gauge measuring planes (section 13 of the 1981 edition;

section 7.4 of this edition);

- Change the finish of gauge measuring planes into roughness (section 14 of 1981

edition; section 7.5 of this edition);

- Add the acceptance and inspection requirements of gauges (section 8 of this

edition);

- Modifyr the recommended gauge types and the size application scope (Annex 1 to

1981 edition; Annex B to this edition);

- Take workpiece determination to be the requirements of the annex (section 3, 4 and

5 of 1981 edition; Annex C of this edition).

This Standard was proposed by China Machinery Industry Federation.

This Standard shall be under the jurisdiction of National Technical Committee on

Measuring Instruments of Standardization (SAC/TC 132).

Drafting organization of this Standard. Harbin Measuring & Cutting Tool Group Co., Ltd.

Main drafters of this Standard. Wu Ying, Gao Shanming, and Yao Xuli.

Thr previous version replaced by this Standard is as follows.

— GB/T 1957-1981.

Tolerances and general features for

plain limit gauges

1 Scope

This Standard specifies the terms and definitions, tolerance, requirements, inspection,

marks and package of plain limit gauges.

This Standard applies to plain limit gauges of which the basic dimensions of holes and

shafts are up to 500mm, and tolerance grades are IT6 to IT16.

The plain limit gauges (hereinafter referred to as gauges) defined in this Standard apply to

inspection of the basic dimensions of holes and shafts specified in GB/T 1800.1-1997 ~

GB/T 1800.4-1999 Limits and Fits.

2 Normative references

The articles contained in the following documents have become part of this document

when they are quoted herein. For the dated documents so quoted, all subsequent

modifications (including all corrigendum) or revisions made thereafter do not apply to this

Standard. However, the parties who reach an agreement according to this Standard are

encouraged to study whether the latest versions of these documents may be used. For

the undated documents so quoted, the latest versions (including all modification sheets)

apply to this document.

GB/T 1800.1-1997 Limits and fits – Bases - Part 1. Terminology (neq ISO 286-1.1988)

GB/T 1800.2-1998 Limits and fits – Bases - Part 2. Basic rules of tolerances, deviations

and fits (eqv ISO 286-1.1988)

GB/T 1800.3-1998 Limits and fits – Bases - Part 3. Numerical values tables of standard

toleranes and fundamental deviations (eqv ISO 286-1.1988)

GB/T 1800. 4-1999 Limits and fits - Tables of standard tolerance grades and limit

deviations for holes and shafts (eqv ISO 286-2.1988)

3 Terms and definitions

The following terms AND definitions determined in GB/T 1800.1-1997 to GB/T

1800.4-1999 apply to this Standard.

9 Marking and Packaging

3 The surface roughness of the measuring plane of a check plug gauge shall not be more

than what is specified in Table A.1.

Table A. 1

Check plug gauges

Basic dimensions of check gauges /mm

Less than or

equal to 120

More than 120,

less than or

equal to 315

More than 315,

less than or

equal to 500

Surface roughness of measuring planes of check

gauges /pm

Check plug gauges of IT6~IT9 working ring

gauges for shafts 0.05 0.10 0. 20

Check plug gauges of IT10~IT12 working ring

gauges for shafts 0.10 0.20 0.40 Check plug gauges of IT13~IT6 working ring

gauges for shafts 0.20 0.40

Annex B

(Informative)

Recommended Gauge Types and Size Application Range

B.1 The recommended gauge types and size application range are shown in Table B.1.

Table B.1

Purpose Recommended order

Gauge's working dimensions /mm

~18 More than 18~100 More than 100~315

More than

315~500

Types of go gauge for

workpiece holes

1 Holomorph plug gauge Non-holomorph plug gauge

Ball-end bar

gauge

2 —

Non-holomorph plug

gauge or sheet plug

gauge

Sheet plug

gauge —

Types of no-go gauge for

workpiece holes

1 Holomorph plug gauge

Holomorph plug gauge or sheet plug

gauge

Ball-end bar

gauge

2 — Non-holomorph plug gauge —

Types of go gauge for

workpiece shafts

1 Ring gauge Caliper gauge

2 Caliper gauge —

Types of no-go gauge for

workpiece shafts

1 Caliper gauge

2 Ring gauge

......