GB/T 308-2002 in English

《GB/T 308-2002滚动轴承 钢球》由TC98（全国滚动轴承标准化技术委员会）归口，主管部门为中国机械工业联合会。
本标准规定了钢球的尺寸、技术要求、标志、测量及检验方法、检验规则、包装及贮存。本标准适用于滚动轴承配套用钢球和商品高碳铬轴承钢球。

1 Scope

This Standard specifies the dimensions, technical requirements, measuring and testing methods, inspection rules, marking and packaging and storage of steel balls.
This Standard is applicable to steel balls and commercial high-carbon chromium bearing steel balls for rolling bearings.

2 Normative References

The following normative documents contain provisions which, through reference in this text, constitute provisions of this Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 7235-1987 Methods for the Assessment of Departure from Roundness — Measurement of Variations in Radius (neq ISO 4291:1985)
GB/T 10610-1998 Geometrical Product Specifications (GPS) — Surface Texture: Profile Method — Rules and Procedures for the Assessment of Surface Texture (eqv ISO 4288:1996)
GB/T 18254-2000 High-carbon Chromium Bearing Steel
GB/T 18579-2001 High-carbon Chromium Bearing Steel
JB/T 1255-1991 Specification for Heat-treatment of Rolling Bearing Parts Made from High Carbon Chromium Steel
JB/T 3034-1993 Rolling Bearings — Oil Seal Rust Prevention Packing
JB/T 7361-1994 Rolling Bearings — Test Method for Hardness of Parts
JB/T 8196-1996 Rolling Bearings — Residual Magnetism and Its Assessment Method
JB/T 8921-1999 Rolling Bearings and Commercial Parts — Inspection Rules

Contents
Foreword I
1 Scope
2 Normative References
3 Terms, Symbols and Definitions
4 Size
5 Technical Requirements
6 Marking
7 Measuring and Testing Method
8 Inspection Rules
9 Packaging and Storage
Appendix A
Appendix B
Appendix C