GB/T 272-2017 PDF English
US$500.00 · In stock · Download in 9 secondsGB/T 272-2017: Rolling bearings - Identification code Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 272: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 272-2017 | English | 500 |
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Rolling bearings - Identification code
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| GB/T 272-1993 | English | 919 |
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Rolling bearing. Identification code
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GB/T 272-2017: Rolling bearings - Identification code---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT272-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.20
J 11
Replacing GB/T 272-1993
Rolling bearings - Identification code
Issued on. JULY 12, 2017
Implemented on. FEBRUARY 01, 2018
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 9
4 Symbols... 9
5 Composition of bearing code... 10
6 Basic code (except needle roller bearings)... 10
7 Basic code of needle roller bearing... 17
8 Compilation rules of basic code... 18
9 Pre-positioned and post-positioned code... 18
10 Bearings with accessories... 29
11 Special representation... 29
12 Special bearing code... 30
13 Preparation requirements... 30
Appendix A (Normative) Code of tapered roller bearing conforming to GB/T
273.1... 31
Appendix B (Normative) Bearing variant structure code... 33
Appendix C (Normative) Bearings without a cage post-positioned code... 42
Appendix D (Normative) Compilation method of non-standard bearing code 44
Appendix E (Normative) Special bearing code... 47
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.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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