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GB/T 272-2017Rolling bearings - Identification code (English PDF)

滚动轴承代号方法

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Issued by

General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the PRC

Level / Type

National · Recommended

Issue date

July 12, 2017

Implementation date

February 1, 2018

Scope

GB/T 272-2017 is the English-translated version of 滚动轴承代号方法.

GB/T 272-2017 sets the rules for compiling the identification codes of rolling bearings and their components, and applies to bearings for general use.

It defines the code as the basic code with a pre-positioned and a post-positioned code, and gives the basic code for bearings other than needle roller bearings, made of type code, size series code and inner diameter code, and the separate basic code for needle roller bearings.

It also covers the compilation rules, bearings with accessories, special representations and the preparation requirements. Five normative appendices give codes for tapered roller bearings to GB/T 273.1, variant structures, bearings without a cage, non-standard bearings and special bearings.

It cites GB/T 273.1, GB/T 273.2, GB/T 273.3, GB/T 276, GB/T 281 and GB/T 283. It replaces GB/T 272-1993, was issued on 12 July 2017 and has applied since 1 February 2018.

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Document preview — GB/T 272-2017

National Standard of the People's Republic of China

ICS: 21.100.20
Classification: J 11
Replacing: GB/T 272-1993

Issued by: General Administration of Quality Supervision, Inspection and Quarantine; Standardization Administration of the PRC

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
5 Composition of bearing code
6 Basic code (except needle roller bearings)
7 Basic code of needle roller bearing
8 Compilation rules of basic code
9 Pre-positioned and post-positioned code
10 Bearings with accessories
11 Special representation
12 Special bearing code
13 Preparation requirements
Appendix A (Normative) Code of tapered roller bearing conforming to GB/T 273.1
Appendix B (Normative) Bearing variant structure code
Appendix C (Normative) Bearings without a cage post-positioned code
Appendix D (Normative) Compilation method of non-standard bearing code
Appendix E (Normative) Special bearing code

1 Scope

This standard specifies the method for compiling codes for rolling bearings (hereinafter referred to as bearings) and their components.

This standard applies to bearings for general use.

2 Normative references

The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) is applicable to this standard.

GB/T 273.1 Rolling bearings Overall dimension plan Part 1: Tapered roller bearings

GB/T 273.2 Rolling bearings - Tapered roller bearing - Plan of boundary dimensions

GB/T 273.3 Rolling bearings - Boundary dimensions, general plan - Part 3: Radial bearings

GB/T 276 Rolling bearings - Deep groove ball bearings - Boundary dimensions

GB/T 281 Rolling bearings - Self-aligning ball bearings - Boundary dimensions

GB/T 283 Rolling bearings - Cylindrical roller bearings - Boundary dimensions

3 Terms and definitions

The terms and definitions as defined in GB/T 4199 and GB/T 6930 apply to this document.

4 Symbols

The symbols as given in GB/T 7811 as well as the following symbols apply to this document.

5 Composition of bearing code

The bearing code is composed of the basic code, the pre-positioned code, the post-positioned code; the arrangement sequence is as specified in Table 1.

6 Basic code (except needle roller bearings)

6.1 Overview

The basic code represents the basic type, structure and size of the bearing and is the basis of the bearing code. The outer dimensions of the bearing conform to the requirements of any standard of GB/T 273.1, GB/T 273.2, GB/T 273.3, GB/T 3882; its basic code is composed of bearing type code, size series code, inner diameter code; its arrangement sequence is according to Table 1.

6.3 Size series code

The size series code is indicated by numbers. The size series code is a combination of the width (height) series code and the diameter series code of the bearing. The size series codes of radial bearings and thrust bearings are in accordance with Table 3.

6.4 Bearing series code

The bearing series code is composed of bearing type code and size series code.

Commonly used bearing types, size series codes and composition bearing series codes are as shown in Table 4. For bearing types and sizes not included

7 Basic code of needle roller bearing

7.1 The external dimensions of needle roller bearings comply with the requirements of GB/T 290, GB/T 4605, GB/T 20056. The basic code is composed of the bearing type code and the size indicating the fitting installation characteristics of the bearing.

7.2 The type code of needle roller bearing is indicated by letters. The size of the bearing fitting installation feature is expressed by the size series, inner diameter code or directly in millimeters. The type code and the basic code of the needle roller bearing indicating the characteristic size of the fitting installation shall be in accordance with the provisions of Table 6.

8 Compilation rules of basic code

In the basic code, when the bearing type code is indicated by letters, it shall be arranged with a half Chinese character space between the bearing size series code, inner diameter code or the number of the installation fitting characteristic size, for example. NJ 230, AXK 0821.

9 Pre-positioned and post-positioned code

9.1 Overview

The pre-positioned and post-positioned codes are supplementary codes added to the left and right of the basic code when the structural shape, size, tolerance, technical requirements of the bearing are changed.

9.2 Pre-positioned code

The pre-positioned code is indicated by letters, which is often used to indicate bearing's sub-components (bearing assemblies). Codes and their meanings are in accordance with Table 7.

9.3 Post-positioned code

9.3.1 Overview

The post-positioned code is indicated by letters (or plus numbers); the bearing characteristics and arrangement sequence indicated by the post-positioned code are in accordance with Table 8.

9.3.2 Rules for compiling post-positioned codes

9.3.3 Post-positioned code and meaning

9.3.3.1 Internal structure

The internal structure code is used to indicate bearings of the same type and dimensions but with different internal structures. Its code and meaning are in accordance with Table 9. […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 51 pages — is available in the English PDF.

Referenced standards

Normative references

Cited by

Similar standards

GB/T 272-1993|GB/T 271-2017|GB/T 273.3-2015|GB/T 276-2013|GB/T 6930-2002|GB/T 307.1-2017

Editions of GB/T 272

Edition	Title	Revision	Status
GB/T 272-2017	Rolling bearings - Identification code	first revision	Current
GB/T 272-1993	Rolling bearings - Identification code	previous edition	Superseded

This page sells the current edition, GB/T 272-2017. Earlier editions are listed for reference only.

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