GB/T 299-2023 English PDF (GB/T299-2023)

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