GB/T 20056-2006 in English

《GB/T 20056-2006滚动轴承 向心滚针和保持架组件 尺寸和公差》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。
本标准规定了向心滚针和保持架组件的外形尺寸及优先选用的尺寸。另外还规定了保持架的宽度公差及自由状态下的检验方法。

1 Scope

This Standard specifies the boundary dimensions for needle roller and cage radial assemblies (hereafter referred to as assemblies), and gives preferred dimensions to be used. In addition, it gives the tolerances for the width of cages and method of checking free operation.

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 309-2000 Rolling Bearings — Needle Rollers (neq ISO 3096:1996)
GB/T 1800.4-1999 Limits and Fits — Tables of Standard Tolerance Grades and Limit Deviations for Holes and Shafts (eqv ISO 286-2:1988)

3 Symbols

Contents
Foreword I
1 Scope
2 Normative References
3 Symbols
4 Boundary Dimensions
5 Tolerances
6 Functional Inspection
Appendix A