GB/T 299-2008 in English

《GB/T 299-2008滚动轴承 双列圆锥滚子轴承 外形尺寸》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。
本标准规定了双列圆锥滚子轴承的外形尺寸。本标准适用于双列圆锥滚子轴承，供轴承制造厂设计和用户选型。

1 Scope

This standard specifies the boundary dimensions of double row tapered roller bearings.
This standard is applicable to double row tapered roller bearings and is used for the bearing manufacturer's design and the customer's type selection.

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 273.1-2003 Rolling Bearings - Tapered Roller Bearing - Plan of Boundary Dimensions (ISO 355: 1977, MOD)
ISO 355: 2007 Rolling Bearings - Tapered Roller Bearings - Boundary Dimensions and Series Designations

3 Symbols (See Figure 1)

Foreword I
1 Scope
2 Normative References
3 Symbols
4 Boundary Dimensions
5 Designation Example
Appendix A (Normative) Boundary Dimensions of Parts of Bearings in ISO 355: 2007