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GB/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 procedure Status: Valid GB/T 272: Historical versions
Similar standardsGB/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/GBT272-2017GB 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 ContentsForeword... 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... 471 ScopeThis 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 referencesThe 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 dimensions3 Terms and definitionsThe terms and definitions as defined in GB/T 4199 and GB/T 6930 apply to this document.4 SymbolsThe symbols as given in GB/T 7811 as well as the following symbols apply to this document.5 Composition of bearing codeThe 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 included7 Basic code of needle roller bearing7.1 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 codeIn 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 code9.1 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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