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GB/T 299-2023 PDF English

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GB/T 299-2023: Rolling bearings - Double-row tapered roller bearings - Boundary dimensions
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GB/T 299: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] deliveryName of Chinese StandardStatus
GB/T 299-2023English290 Add to Cart 0-9 seconds. Auto-delivery Rolling bearings - Double-row tapered roller bearings - Boundary dimensions Valid
GB/T 299-2008English559 Add to Cart 3 days Rolling bearings -- Double row tapered roller bearings -- Boundary dimensions Obsolete
GB/T 299-1995English439 Add to Cart 4 days Rolling bearings--Metric double row tapered roller bearings--Boundary dimensions Obsolete
GB 299-1985English239 Add to Cart 2 days Rolling bearings--Metric double row tapered roller bearings--Boundary dimensions Obsolete

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Similar standards

GB/T 300   GB/T 301   GB/T 297   GB/T 292   

GB/T 299-2023: Rolling bearings - Double-row tapered roller bearings - Boundary dimensions

---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/GBT299-2023
GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 21.100.20 CCS J 11 GB/T 299-2023 Replacing GB/T 299-2008 Rolling bearings - Double-row tapered roller bearings - Boundary dimensions 滚动轴承 双列圆锥滚子轴承 外形尺寸 ISSUED ON: MAY 23, 2023 IMPLEMENTED ON: DECEMBER 01, 2023 Issued by: State Administration for Market Regulation; 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 ... 4 5 Identification method ... 5 6 Marking ... 6 7 Boundary dimensions ... 6 Annex A (normative) Dimensions of other dimension series bearings in GB/T 273.1- 2023 ... 13

Foreword

This document was drafted in accordance with the provisions of GB/T 1.1-2020 “Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents”. This document replaces GB/T 299-2008 “Rolling bearings - Double row tapered roller bearings - Boundary dimensions”. Compared with GB/T 299-2008, in addition to editorial changes, the main technical changes are as follows: a) ADD the terms and definitions (see Clause 3); b) ADD the symbol and values of the contact angle of bearings (see Clause 4, Table 1 to Table 8, Table A.1 to Table A.4); c) ADD the identification code (see Clause 5); d) ADD the ISO dimension series code corresponding to the series 22 bearings (see Table 7); e) ADD the minimum single inner ring back face chamfer dimension rs min of some bearings (see Table A.1 to Table A.4). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing authority of this document shall not be held responsible for identifying any or all such patent rights. This document was proposed by China Machinery Industry Federation. This document shall be under the jurisdiction of National Technical Committee for Standardization on Rolling Bearing (SAC/TC 98). Drafting organizations of this document: Luoyang LYC Bearing Co., Ltd., Luoyang Bearing Research Institute Co., Ltd., Chongqing Changjiang Bearing Co., Ltd. Main drafters of this document: Pang Bitao, Pan Long, Zhang Bowen, Zhao Xingxin, Wang Jincheng. The previous released versions replaced by this document are as follows: - GB 299-1964, GB/T 299-1985, GB/T 299-1995, GB/T 299-2008; - this is the fourth revision. Rolling bearings - Double-row tapered roller bearings - Boundary dimensions

1 Scope

This document specifies the boundary dimensions of double-row tapered roller bearings (hereinafter referred to as “bearings”) that comply with GB/T 273.1-2023. This document applies to the design and user selection of double-row tapered roller bearings with double raceway outer rings.

2 Normative references

The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. GB/T 272 Rolling bearings - Identification code GB/T 273.1-2023 Rolling bearings - Boundary dimensions general plan - Part 1: Tapered roller bearings GB/T 274-2023 Rolling bearings - Chamfer dimension - Maximum values GB/T 6930 Rolling bearings - Vocabulary

3 Terms and definitions

For the purpose of this document, the terms and definitions defined in GB/T 6930 apply.

4 Symbols

The following symbols apply to this document. Unless otherwise specified, the symbols shown in Figure 1 and the values shown in Tables 1 to 8 and Tables A.1 to A.4 all represent nominal dimensions. B: width of a single inner ring; B1: width of bearing; C2: width of double raceway outer ring;

6 Marking

Double-row tapered roller bearings are marked in the order of “rolling bearing”, bearing code and standard number. Example: A double-row tapered roller bearing, with dimension series 21 and a nominal bore diameter of 180 mm, complying with the provisions of GB/T 299-2023 is marked as: Rolling bearing 352136 GB/T 299-2023

7 Boundary dimensions

The boundary dimensions of bearings shall comply with the provisions of Tables 1 to 8. The meaning of ISO dimension series code shall comply with the provisions of GB/T 273.1-2023. The maximum single chamfer dimensions corresponding to rs min and r1s min in Tables 1 to 8 shall comply with the provisions of GB/T 274-2023. The boundary dimensions of other dimension series bearings specified in GB/T 273.1- 2023 shall comply with the provisions of Annex A. ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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