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GB/T 271-2017 English PDF (GBT271-2017)

GB/T 271-2017 English PDF (GBT271-2017)

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GB/T 271-2017: Rolling bearings -- Classification

This Standard specifies the classification of rolling bearings. This Standard is applicable to the classification management of rolling bearing products.
GB/T 271-2017
GB
NATIONAL STANDARD OF
THE PEOPLE REPUBLIC OF CHINA
ICS 21.100.20
J 11
Replacing GB/T 271-2008
Rolling bearings - Classification
ISSUED ON. MAY 12, 2017
IMPLEMENTED ON. DECEMBER 1, 2017
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine;
Standardization Administration Committee.
3. No action is required - Full-copy of this standard will be automatically and immediately delivered to your EMAIL address in 0~60 minutes.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 6
4 Rolling bearing structure type classification ... 6
5 Rolling bearing size classification ... 9
Annex A (Normative) Rolling bearing comprehensive classification structure diagram ... 10
Foreword
This Standard was drafted in accordance with the rules given in GB/T
1.1-2009.
This Standard replaces GB/T 271-2008 Rolling bearings - Classification. Compared with GB/T 271-2008, the main technical modifications are as
follows.
- added ?€?long face roller bearings?€? in classification according to roller type (see 4.2 of this Edition);
- modified the name of ?€?open bearing, closed bearing?€? to ?€?open type
bearing, closed type bearing?€?; and modified the definition of closed type bearing (see 4.7 of this Edition, 4.7 of Edition 2008);
- modified the definitions of separable bearing and un-separable bearing (see 4.9 of this Edition, 4.9 of Edition 2008);
- added ?€?large bearing?€? in the classification according to nominal
diameter size (see Clause 5 of this Edition);
- added structure type of some bearings (see Table B.1 of this Edition). This Standard was proposed by China Machinery Industry Federation.
This Standard 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 Standard. Luoyang Bearing Research
Institute Co., Ltd., Fujian Yongan Bearing Co., Ltd., National Accreditation Center for Chinese Conformity Assessment, Handan Hongli Bearing Co., Ltd. Main drafters of this Standard. Zhang Bowen, Qian Weihua, Ding Liyong, Qin Zhitao, Wang Lifeng.
Versions of standard substituted by this Standard are.
- GB 271-1964, GB 271-1987, GB/T 271-1997, GB/T 271-2008.
Rolling bearings - Classification
1 Scope
This Standard specifies the classification of rolling bearings.
This Standard is applicable to the classification management of rolling bearing products.
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 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 rolling bearings - Boundary
dimensions
GB/T 285, Rolling bearings - Double row cylindrical roller bearings -
Boundary dimensions
GB/T 288, Rolling bearings - Self-aligning roller bearings - Boundary
dimensions
GB/T 290, Rolling bearings - Needle roller bearings, drawn cup without
inner rings - Boundary dimensions
GB/T 292, Rolling bearings - Angular contact ball bearings - Boundary
dimensions
GB/T 294, Rolling bearings - Three-point and four-point contact ball
bearings - Boundary dimensions
GB/T 296, Rolling bearings - Double row angular contact ball bearings - Boundary dimensions
GB/T 297, Rolling bearings - Tapered roller bearings - Boundary
dimensions
GB/T 299, Rolling bearings - Metric double row tapered roller bearings - Boundary dimensions
GB/T 300, Rolling bearings - Four row tapered roller bearings - Boundary dimensions
GB/T 301, Rolling bearings - Thrust ball bearings - Boundary dimensions GB/T 3882, Rolling bearings - Insert bearings and eccentric looking collars - Boundary dimensions
GB/T 4605, Rolling bearings - Thrust needle roller and cage assemblies, thrust washers
GB/T 4663, Rolling bearings - Cylindrical thrust roller bearings - Boundary dimensions
GB/T 5801, Rolling bearings - Needle roller bearings, dimension series 48, 49 and 69 - Boundary dimensions and tolerances
GB/T 5859, Rolling bearings - Self-aligning thrust roller bearings -
Boundary dimensions
GB/T 6445, Rolling bearings - Needle roller bearing track rollers -
Boundary dimensions and tolerances
GB/T 6930, Rolling bearings - Vocabulary
GB/T 16643, Rolling bearings - Combined needle roller - Thrust roller
bearings - Boundary dimensions
GB/T 20056, Rolling bearings - Radial needle roller and cage assemblies - Boundary dimensions and tolerances
GB/T 24604, Rolling bearings - Angular contact thrust ball bearings used for machine tool screws
GB/T 25760, Rolling bearings - Combined needle roller bearings with
thrust ball bearings - Boundary dimensions
GB/T 25761, Rolling bearings - Combined needle roller bearings with
angular contact ball bearings - Boundary dimensions
GB/T 25768, Rolling bearings - Combined needle roller bearings with
double direction thrust cylindrical roller bearings
b) particular bearing - the bearing particularly used in or mainly used in specific host or special condition.
4.6 Rolling bearing, according to whether the dimensions conform to the standard size, is divided into.
a) standard bearing - the bearing that dimensions comply with standard
size;
b) non-standard bearing - the bearing that any size in dimensions does not comply with the provisions on standard size.
4.7 Rolling bearing, according to whether it has seal or dust cover, is divided into.
a) open type bearing - the bearing without dust cover and seal;
b) closed type bearing - the bearing with dust cover or seal.
4.8 Rolling bearing, according to the representation unit for dimension size and tolerance, is divided into.
a) metric bearing - the rolling bearing of which dimension size and
tolerance uses metric unit;
b) inch bearing - the rolling bearing of which dimension size and tolerance uses inch unit.
4.9 Rolling bearing, according to whether its component can be separated, is divided into.
a) separable bearing - the bearing of which sub-component can be
separated;
b) un-separable bearing - the bearing of which sub-component cannot be
separated.
4.10 Rolling bearing, according to product extension classification, is divided into.
a) bearing;
b) combined bearing;
c) bearing unit.
4.11 Rolling bearing, according to its structural shape (e.g., with or without outer ring, with or without cage, with or without groove as well as the shape of the ring, the structure of the rib, etc.), can be also divided into many structural

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