GB/T 290-1998 in English

《GB/T 290-1998滚动轴承 冲压外圈滚针轴承 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。
本标准规定了直径系列1的无内圈冲压外圈滚针轴承（以下简称轴承）的外形尺寸。本标准适用于冲压外圈滚针轴承的设计、制造并供用户选型。

1 Scope

This Standard specifies the boundary dimensions of diameter series 1 of drawn cup needle roller bearings without inner rings (hereinafter referred to as bearings).
This Standard is applicable to the design, manufacture and user selection of drawn cup needle roller bearings.

2 Symbols and Abbreviated Terms (see Figures 1 and 2)

Fw: Needle roller complement bore diameter;
D: Drawn cup outside diameter;
C: Drawn cup width;
C1: End thickness of profiled end drawn cup;
rs: Single chamfer dimension;
rsmin: Smallest permissible single chamfer dimension;
d0: Oil orifice diameter.

Contents
Foreword I
1 Scope
2 Symbols and Abbreviated Terms (see Figures 1 and 2)
3 Boundary Dimensions
4 Designation