GB/T 297-2015 English PDF (GBT297-2015)

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GB/T 297-2015: Rolling bearings -- Tapered roller bearings -- Boundary dimensions
GB/T 297-2015
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 21.100.20
J 11
Replacing GB/T 297-1994
Rolling bearings –
Tapered roller bearings – Boundary dimensions
滚动轴承
圆锥滚子轴承 外形尺寸
ISSUED ON. FEBRUARY 4, 2015
IMPLEMENTED ON. OCTOBER 1, 2015
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
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 Codes ... 6 
6 Designation example ... 6 
7 Dimensions... 6 
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard replaces GB/T 297-1994, Rolling bearings – Tapered roller bearings -
Boundary dimensions. Compared with GB/T 297-1994, the main technical changes of
this Standard are as follows.
-- it adds “Terms and Definitions” (see Chapter 3);
-- it modifies part of the symbols (see Chapter 4; Chapter 3 of Edition 1994);
-- it adds “Codes” (see Chapter 5);
-- it adjusts the sequence of the tables (see Table 1 to Table 10; Table 1 to Table 10
of Edition 1994);
-- it adds part of the bearing types and dimensions of series 02, 22 and 23 (see
Table 5, Table 6 and Table 10);
-- it adds the serial codes of ISO dimensions (see Table 1 to Table 10); and
-- it deletes the contrast between the codes of the new and old bearings (Annex A
of Edition 1994).
This Standard was proposed by China Machinery Industry Federation.
This Standard shall be under the jurisdiction of the National Standardization Technical
Committee on Rolling Bearings (SAC/TC 98).
The drafting organizations of this Standard. Luoyang Bearing Research Institute Co.,
Ltd., Fujian Province Yongan Bearing Co., Ltd., China Jinfa Bearing Co., Ltd. and
Dalian Guangyang Bearing Co., Ltd.
The main drafters of this Standard. Guo Baoxia, Chen Defu, Li Xianhong and Yang
Xingnian.
The previous editions replaced by this Standard are as follows.
-- GB 297-1964, GB 297-1984 and GB/T 297-1994;
-- GB 298-1964.
Rolling bearings –
Tapered roller bearings – Boundary dimensions
1 Scope
This Standard specifies the boundary dimensions of single-row tapered roller bearings
in accordance with GB/T 273.1-2011 (hereinafter referred to as bearings).
This Standard applies to the design and selection of bearings.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition dated applies to this document. For
undated references, the latest edition of the referenced documents (including all
amendments) applies to this Standard.
GB/T 272-1993, Rolling bearing – Identification code
GB/T 273.1-2011, Rolling bearings – Boundary dimensions general plan – Part 1.
Tapered roller bearings
GB/T 274-2000, Rolling bearings – Chamfer dimension – Maximum values
GB/T 6930-2002, Rolling bearings – Vocabulary
JB/T 2974-2004, Rolling bearings – Identification code – Supplemental regulations
3 Terms and definitions
For the purpose of this document, the terms and definitions defined in GB/T 6930-2002
shall apply.
4 Symbols
The following symbols apply to this document.
Unless specified otherwise, the symbols in Figure 1 and the numerical values in Table
1 to Table 10 are all nominal dimensions.
NOTE The figures are only structural examples; the bearings are not necessary to be identical
to the structures in the figures, but they shall meet the dimensions specified.
B. innder ring width.
C. outer ring width.
D. bearing outer diameter.
d. bearing inner diameter.
E. outer ring back inner diameter.
r. inner ring back chamfer dimension.
rsmin. inner ring back minimum single chamfer dimension.
r1. outer ring back chamfer dimension.
r1smin. outer ring back minimum single chamfer dimension.
r2. front chamfer dimensions of outer ring and inner ring.
T. bearing width.
α. contact angle.