1. Scope
This standard specifies the technical requirements, inspection method, inspection rule, marking and packaging of miniature ball bearings for general purpose with bore diameter of 0.6~10mm and boundary dimensions consistent with GB/T 273.3.
This standard is applicable to the deep groove ball bearings and angular contact ball bearings (including bearings with flanged outer rings) of each tolerance grade and the self-aligning ball bearings of Grades 0, 6 and 5.
2. Normative Reference
The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, subsequent amendments to (excluding amending errors in the text), or revisions of, any of these publications do not apply. However, all parties coming to an agreement according to this standard are encouraged to study whether the latest edition of the normative document is applicable. For undated references, the latest edition of the normative document applies.
GB/T 273.3-1999 Rolling Bearings - Radial Bearings - Boundary Dimensions - General Plan (eqv ISO 15:1998)
GB/T 292-1994 Rolling Bearings - Angular Contact Ball Bearings - Boundary Dimensions
GB/T 307.1-2005 Rolling Bearings - Radial Bearings - Tolerances (ISO 492:2002, MOD)
GB/T 307.2-2005 Rolling Bearings - Measuring and Gauging Principles and Methods (ISO 1132-2:2001, Roiling Bearings - Tolerances - Part 2: Measuring and Gauging Principles and Methods, MOD)
GB/T 307.3-2005 Rolling Bearings - General Technical Regulations
GB/T 4604-1993 Rolling Bearings - Radial Internal Clearance (eqv ISO 5753:1991)
GB/T 5800-2003 Rolling Bearings - Instrument Precision Bearing (ISO 1224:1984, MOD)
GB/T 7218-1995 Rolling Bearings - Miniature Radial Ball Bearings with Flanged Outer Ring - Boundary Dimensions
GB/T 7811-1999 Rolling Bearings - Symbols for Quantities
GB/T 8597-2003 Rolling Bearings - Rust Proof Packaging
GB/T 18254-2002 High-carbon Chromium Bearing Steel
BB/T 1255-2001 Specification for Heat-treatment of Rolling Bearing Parts Made from High Carbon Chromium Steel
GB/T 3573-2004 Rolling Bearings - Methods for the Measurement of Radial Internal Clearance
JB/T 3574-1997 Rolling Bearings - Marking for Products
JB/T 5313-2001 Rolling Bearing - Measuring Methods for Vibration (Velocity)
JB/T 5314-2002 Rolling Bearing - Measuring Methods for Vibration (Acceleration)
JB/T 6641-1993 Rolling Bearings - Residual Magnetism and its Assessment Method
JB/T 7047-1999 Rolling Bearings - Specifications of Vibration (Acceleration) for Deep Groove Ball Bearings
JB/T 7050-1993 Rolling Bearings - Assessment Methods for Cleanliness
JB/T 7752-1995 Sealed Deep Groove Ball Bearings - Specifications
JB/T 8571-1997 Rolling Bearings - Sealed Deep Groove Ball Bearings - Performance Test Rule of Dustproofing, Grease Leakage and Temperature Rise
JB/T 8921-1999 Rolling Bearings and Commercial Parts - Inspection Rules
JB/T 10187-2000 Rolling Bearings - Vibration for Deep Groove Ball Bearings (Velocity) - Specifications
Contents
Foreword I
1. Scope
2. Normative Reference
3. Symbols
4. Technical Requirements
4.1 Material and Heat Treatment
4.2 Tolerance
4.3 Internal Clearance and Contact Angle
4.4 Residual Magnetism
4.5 Rotating Flexibility Requirements
4.6 Cleanliness
4.7 Vibration
4.8 Appearance Quality for Finished Product
4.9 Other Technical Requirements
5. Inspection Method
5.1 Measurement for Boundary Dimensions and Rotating Accuracy
5.2 Inspection for Width Deviation △Ts (See Figure 1 and Figure 2)
5.3 Measurement for Radial Internal Clearance
5.4 Measurement of Residual Magnetism
5.5 Rotating Flexibility Inspection
5.6 Cleanliness Inspection
5.7 Vibration Inspection
5.8 Inspection for Assembly Quality and Appearance Quality
5.9 Inspection for Grease Leakage, Temperature Rise and Dust Proof
6. Inspection Rules
7. Marking and Packaging
7.1 Marking
7.2 Rust Proof and Packaging
Appendix A (Informative) Radial Internal Clearance Value under Load Measurement
