GB/T 300-2023 English PDF (GBT300-2023)

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GB/T 300-2023: Rolling bearings -- Four-row tapered roller bearings -- Boundary dimensions
GB/T 300-2023
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.20
CCS J 11
Replacing GB/T 300-2008
Rolling Bearings - Four-row Tapered Roller Bearings -
Boundary Dimensions
滚动轴承 四列圆锥滚子轴承 外形尺寸
ISSUED ON: MAY 23, 2023
IMPLEMENTED ON: DECEMBER 1, 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 Code ... 5
6 Marking ... 6
7 Boundary Dimensions ... 6
Foreword
This document was drafted in accordance with the rules of GB/T 1.1-2020 Directives for
Standardization - Part 1: Rules for the Structure and Drafting of Standardizing Documents.
This document serves as a replacement of GB/T 300-2008 Rolling Bearings - Four Row
Tapered Roller Bearings - Boundary Dimensions. In comparison with GB/T 300-2008, apart
from editorial modifications, the main technical changes are as follows:
a) The Chapter “Terms and Definitions” is added (see Chapter 3);
b) The symbol and value of the contact angle of bearings are added (see Chapter 4 and
Table 1 ~ Table 6);
c) The Chapter “Identification Code” is added (see Chapter 5).
Please be noted that certain content of this document may involve patents. The institution
issuing this document does not undertake the responsibility of identifying these patents.
This document was proposed by China Machinery Industry Federation.
This document shall be under the jurisdiction of National Technical Committee on Rolling
Bearings of Standardization Administration of China (SAC/TC 98).
The drafting organizations of this document: Luoyang LYC Bearings Co., Ltd.; Luoyang
Bearing Research Institute Co., Ltd.
The main drafters of this document: Dong Hanjie, Ding Jianqiang, Fan Qiang, Zhang Bowen.
The issuing of the previous versions:
---GB 300-1964, GB 300-1987, GB/T 300-1995, GB/T 300-2008;
---This is the fourth revision.
Rolling Bearings - Four-row Tapered Roller Bearings -
Boundary Dimensions
1 Scope
This document specifies the boundary dimensions of four-row tapered roller bearings.
This document is applicable to the design and user type selection of four-row tapered roller
bearings.
2 Normative References
The contents of the following documents constitute indispensable clauses of this document
through the normative references in the text. In terms of references with a specified date, only
versions with a specified date are applicable to this document. In terms of references without a
specified date, the latest version (including all the modifications) is applicable to this document.
GB/T 272 Rolling Bearings - Identification Code
GB/T 274-2023 Rolling Bearings - Chamfer Dimension - Maximum Values
GB/T 6930 Rolling Bearings - Vocabulary
3 Terms and Definitions
The terms and definitions defined in GB/T 6930 are applicable to this document.
4 Symbols
The following symbols are applicable to this document.
Unless otherwise specified, the symbols shown in Figure 1 and the values shown in Table 1 ~
Table 6 represent nominal dimensions.
B: overall width of bearing inner ring
B1: double raceway inner ring width
b: width of outer ring spacer
C: overall width of bearing outer ring