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GB/T 1957-2006 PDF in English


GB/T 1957-2006 (GB/T1957-2006, GBT 1957-2006, GBT1957-2006)
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GB/T 1957-2006: PDF in English (GBT 1957-2006)

GB/T 1957-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 17.040.30
J 42
Replacing GB/T 1957-1981
Tolerances and general features for
plain limit gauges
ISSUED ON. FEBRUARY 05, 2006
IMPLEMENTED ON. AUGUST 01, 2006
Issued by.
General Administration of Quality Supervision, Inspection
and Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Symbols ... 5 
5 Gauge Codes and Rules for Use ... 5 
6 Tolerance ... 6 
7 Requirements ... 9 
8 Acceptance and Inspection ... 9 
9 Marking and Packaging ... 10 
Annex A ... 12 
Annex B ... 13 
Annex C ... 14 
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.
8.1 Acceptance
8.1.1 The specified dimension values in this Standard are subject to standard measuring
conditions, that is, temperature is 20°C and the measuring force is zero.
8.1.2 The inspection of ring gauges shall be subject to calibration. If there are disputes,
C.3 in Annex C will prevail.
8.2 Inspection
8.2.1 All the parameters of a gauge shall be subject to direct inspection; the major
inspection parameters and inspection instruments are tabulated in Table 5.
Table 5
Major inspection parameters Inspection instruments
Surface roughness Profilers, surface roughness comparison specimens
Roundness of Holomorph plug gauges and ring gauges Roundness measuring instruments
Generatrix straightness Profilers, Grade-0 knife straight edges
Flatness of caliper gauge measuring planes Knife straight edges, optical flats
Parallelism of caliper gauge measuring planes Optimeters, length measuring instruments
Hardness Vickers hardness testers (or Rockwell hardness testers)
8.3 Decision on the qualification of a workpiece shall be consistent with that in Annex C.
9 Marking and Packaging
9.1 The end face of a plug gauge probe and the non-working surface of other gauges shall
be marked with.
a) The manufacturer name and registered trademark;
b) Basic dimension and tolerance codes of the inspected workpiece;
c) Codes of use of a gauge;
d) Year of manufacture.
Note 1. Plug gauges with working dimensions less than 14mm are allowed to mark the requirements
from a) to d) on the handle or nameplate.
Note 2. Single-head double-limit gauges should better not be marked with the code of use.
9.2 The packing box shall be marked with.
a) The manufacturer name and registered trademark;
b) The name of the product;
c) Basic dimension and tolerance codes of the inspected workpiece.
9.3 Gauges shall be subject to anti-corrosive treatment before being properly packaged.
9.4 Gauges that are verified to be satisfactory to this Standard shall be furnished with a
certificate, on which the number of this Standard and the date of manufacture shall be
marked.
Annex A
(Informative)
Check Gauges
A.1 The dimensional tolerance of a check gauge is 1/2 of that of a working gauge for
shafts; the dimensional tolerance of a check gauge contains shape errors.
A.2 The surface appearance of check gauges, the degree of connection of probes and
handles, the making material, the measuring plane hardness and treatment shall be in
conformity with 7.1~7.4, 7.6.
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
......
 
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.