GB/T 24604-2009 in English

《GB/T 24604-2009滚动轴承 机床丝杠用推力角接触球轴承》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。
本标准规定了机床丝杠支承用米制系列推力角接触球轴承(以下简称轴承)的代号方法、外形尺寸和技术条件。
本标准供轴承制造厂生产、检验和用户选型、验收。

1 Scope

This standard specifies the designation method, boundary dimension and technical conditions of the metric series angular contact thrust ball bearings used for supporting the machine tool screws (hereinafter referred to as "bearings").
This standard is applicable to the production and inspection of the bearing manufacturers and the type selection and acceptance of the users.

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 (excluding corrections to), 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 editions of these documents are applicable. For undated references, the latest edition of the normative documents referred to applies.
GB/T 272-1993 Rolling Bearing - Identification Code
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, MOD)
GB/T 307.3-2005 Rolling Bearings - General Technical Regulations
GB/T 4199-2003 Rolling Bearings - Tolerances - Definitions (ISO 1132-1: 2000, MOD)
GB/T 8597-2003 Rolling Bearings-Rust Proof Packaging
GB/T 18254-2002 High-carbon Chromium Bearing Steel
GB/T 24605-2009 Rolling Bearings-Marking for Products
GB/T 24608-2009 Inspection Rules for Rolling Bearings and Commercial Parts
JB/T 1255-2001 Specification for Heat-treatment of Rolling Bearing Parts Made from High Carbon Chromium Steel
JB/T 2974-2004 Rolling Bearings-Identification Code-Supplemental Regulations
JB/T 6641-2007 Rolling Bearings - Residual Magnetism and Its Assessment Method
JB/T 7048-2002 Rolling Bearing Parts - Plastic Cage - Specifications
JB/T 7051-2006 Rolling Bearing Parts-Methods for the Measurement and Assessment of Surface Roughness
JB/T 10186-2000 Rolling bearings - Specifications of Matched Angular Contact Ball Bearings

Contents
Foreword I
1 Scope
2 Normative References
3 Symbols (See Figure 1)
4 Designation Method
5 Marking Example
6 Boundary Dimensions
7 Technical Requirements
8 Measurement Methods
9 Inspection Rules
10 Marking
11 Packaging
Appendix A (Normative) Schematic Diagram for Measurement of Bearing Starting Friction Moment