Standard No.:	JB/T 2781-2005
English Name:	Rolling bearings - Miniature ball bearings-Specifications
Chinese Name:	滚动轴承 微型球轴承 技术条件
Chinese Classification:	J11    Rolling bearing
Professional Classification:	JB    Professional Standard - Machinery
ICS Classification:	21.100.20 21.100.20    Rolling bearings 21.100.20
Issued by:	NDRC
Issued on:	2005-9-23
Implemented on:	2006-1-1
Status:	superseded
Superseded by:	JB/T 2781-2015
Superseded on:	2016-3-1
Superseding:	JB/T 2781-1991
Language:	English
File Format:	PDF
Word Count:	2500 words
Price(USD):	90.0
Delivery:	via email in 1 business day

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