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GB/T 307.3-2017 English PDF (GBT307.3-2017)

GB/T 307.3-2017 English PDF (GBT307.3-2017)

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GB/T 307.3-2017: Rolling bearings -- General technical regulations

This Part of GB/T 307 specifies the general technical regulations for rolling bearings. This Part is applicable to rolling bearings of general purpose. For special-purpose bearings, additional technical conditions may be formulated.
GB/T 307.3-2017
GB
NATIONAL STANDARD OF
THE PEOPLE REPUBLIC OF CHINA
ICS 21.100.20
J 11
Replacing GB/T 307.3-2005
Rolling bearings - General technical regulations
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 ... 5
2 Normative references ... 5
3 Terms and definitions ... 8
4 Symbols... 8
5 Bearings ... 8
6 Bearing parts ... 13
7 Bearing accessories ... 13
8 Bearing application ... 14
Foreword
GB/T 307 Rolling bearings consists of the following four parts.
- GB/T 307.1-2005, Rolling bearings - Radial bearings - Tolerances;
- GB/T 307.2-2005, Rolling bearings - Measuring and gauging principles
and methods;
- GB/T 307.3-2017, Rolling bearings - General technical regulations;
- GB/T 307.4-2012, Rolling bearings - Tolerances - Part 4. Tolerances for thrust bearings.
This Part if the third part of GB/T 307.
This Part was drafted in accordance with the rules given in GB/T 1.1-2009. This Part replaces GB/T 307.3-2005 Rolling bearings - General technical regulations. Compared with GB/T 307.3-2005, the main technical changes in this Part are.
- modified the level, number and name of some reference standards (see
Clause 2 of this Edition, Clause 2 of Edition 2005);
- subdivided the surface roughness value for nominal diameter of 80mm
~ 500mm and modified some surface roughness values (see Table 1 of
this Edition; Table 1 of Edition 2005);
- added the clearances of four-point-contact ball bearings and double,
four-row tapered roller bearings as well as measurement methods (see
5.6, 5.16.3 of this Edition);
- added the sealing, cleanliness and appearance quality requirements of bearing (see 5.11~5.13 of this Edition);
- added the calculation method for rated thermal speed of bearing (see
5.15.3 of this Edition);
- added the measurement method for bearing surface roughness (see
5.16.4 of this Edition);
- added the bearing cleanliness, inspection method for appearance
quality as well as test and evaluation of service life (see 5.16.8~5.16.10 of this Edition);
- added the rolling body (ceramic ball, tapered roller), cage, seal and dust cover requirements (see 6.1~6.3 of this Edition);
Rolling bearings - General technical regulations
1 Scope
This Part of GB/T 307 specifies the general technical regulations for rolling bearings.
This Part is applicable to rolling bearings of general purpose. For
special-purpose bearings, additional technical conditions may be formulated. 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 271, Rolling bearings - Classification
GB/T 272, Rolling bearing - Identification code
GB/T 273.1, Rolling bearings - Tapered roller bearing - Plan of boundary dimensions
GB/T 273.2, Rolling bearings - Thrust bearings - Boundary dimensions,
general plan
GB/T 273.3, Rolling bearings - Boundary dimensions, general plan - Part 3. Radial bearings
GB/T 274, Rolling bearings - Chamfer dimension - Maximum values
GB/T 275, Rolling bearings - Fits
GB/T 305, Rolling bearings - Snap ring groove and snap ring on outer ring - Dimensions and tolerances
GB/T 307.1, Rolling bearings - Radial bearings - Tolerances
GB/T 307.2, Rolling bearings - Measuring and gauging principles and
methods
GB/T 307.4, Rolling bearings - Tolerances - Part 4. Tolerances for thrust bearings
GB/T 308.1, Rolling bearings - Balls - Part 1. Steel balls
GB/T 308.2, Rolling bearings - Balls - Part 2. Ceramic balls
GB/T 309, Rolling bearings - Needle rollers
GB/T 4604.1, Rolling bearings - Internal clearance - Part 1. Radial internal clearance for radial bearings
GB/T 4604.2, Rolling bearings - Internal clearance - Part 2. Axial internal clearance for four-point-contact ball bearings
GB/T 4661, Rolling bearings - Cylindrical rollers
GB/T 4662, Rolling bearings - Static load ratings
GB/T 5868, Rolling bearings - Mounting dimensions
GB/T 6391, Rolling bearings - Dynamic load ratings and rating life
GB/T 6930, Rolling bearings - Vocabulary
GB/T 7811, Rolling bearings - Symbols for physical quantities
GB/T 7813, Rolling bearings - Split type plummer block housings -
Boundary dimensions
GB/T 8597, Rolling bearings - Rust proof packaging
GB/T 9160.1, Rolling bearings - Accessories - Part 1. Adapter sleeve
assemblies and withdrawal sleeves
GB/T 9160.2, Rolling bearings - Accessories - Part 2. Locknuts and locking devices
GB/T 18254, High-carbon chromium bearing steel
GB/T 24605, Rolling bearings - Marking for products
GB/T 24607, Rolling bearings - Test and assessment for life and reliability GB/T 24608, Inspection rules for rolling bearings and commercial parts
GB/T 24609, Rolling bearings - Thermal speed rating - Calculation and
coefficients
GB/T 24610.2, Rolling bearings - Measuring methods for vibration - Part 2. Radial ball bearings with cylindrical bore and outside surface
GB/T 24610.3, Rolling bearings - Measuring methods for vibration - Part 3. Radial spherical and tapered roller bearings with cylindrical bore and
outside surface
GB/T 24610.4, Bearings - Measuring methods for vibration - Part 4. Radial cylindrical roller bearings with cylindrical bore and outside surface
GB/T 24611, Rolling bearings - Damage and failures - Terms,
characteristics and causes
GB/T 25767, Rolling bearings - Tapered rollers
GB/T 25769, Rolling bearings - Measuring methods for radial internal
clearance
GB/T 28268, Rolling bearings - Specifications of pressed cages
GB/T 32323, Rolling bearings - Measuring methods for axial internal
clearance of four-point-contact ball bearings
GB/T 32325, Rolling bearings - Specifications for vibration (velocity) of deep groove ball bearings
GB/T 32333, Rolling bearings - Measuring methods and specifications for vibration (acceleration)
JB/T 1255, Rolling Bearings - Parts made from high-carbon chromium
bearing steels - Specifications for heat treatment
JB/T 6639, Rolling bearing parts - Skeleton acrylonitrile-buta-diene
copolymers seal - Specifications
JB/T 6641, Rolling bearings - Residual magnetism and its assessment
method
JB/T 7048, Rolling bearing parts - plastic cage-specifications
JB/T 7050, Rolling bearings - Assessment methods for cleanliness
JB/T 7051, Rolling bearing parts - Methods for the measurement and
assessment of surface roughness
JB/T 7752, Rolling bearings - Sealed deep groove ball bearings -
Specifications
JB/T 8236, Rolling bearings - Internal clearances and adjusting methods for double-row and four-row tapered roller bearings
JB/T 8874, Rolling bearings - Split type plummer block housings -
Specifications
JB/T 8922, Rolling bearings - Specifications for vibration(velocity)of
cylindrical roller bearings
JB/T 10236, Rolling bearings - Specifications of vibration (velocity) for tapered roller bearings -Specifications
JB/T 10237, Rolling bearings - Specifications of vibration (acceleration) for tapered roller bearings
JB/T 10239, Rolling bearings - Specifications of curled shield for deep groove ball bearings
JB/T 11841, Rolling bearing parts - Metal solid cages - Specifications
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 6930 apply.
4 Symbols
The symbols provided in GB/T 7811 apply to this document.
5 Bearings
5.1 Classification
The classification for bearings shall comply with the provisions of GB/T 271. 5.2 Code
The code for bearings shall comply with the provisions of GB/T 272.
5.3 Dimensions
The bearing dimensions shall comply with the provisions of GB/T 273.1, GB/T 273.2, GB/T 273.3.
5.4 Tolerance grade and tolerance
The bearing shall be graded according to size tolerance and rotation accuracy. The tolerance grades are arranged in descending order. Its tolerance shall comply with the provisions of GB/T 307.1, GB/T 307.4.
Radial bearing (except tapered roller bearing) is divided into five grades. ordinary, 6, 5, 4, 2.
5.14 Interchangeability
5.14.1 For separate angular contact ball bearings (S70000 type) of ordinary grade tolerance, tapered roller bearings of ordinary grade, 6X grade
tolerances, their subparts shall be interchangeable.
5.14.2 For cylindrical roller bearings of ordinary grade tolerance, needle roller bearings with inner and outer rings and cage, when user has
requirements for interchangeability, it shall be submitted by interchange. 5.15 Rated load...

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