DIN 5401:2002-8

等级Grade公称直径Dw（mm）Nominal diameter极限偏差(μm)(5)Limit deviations滚珠直径变化Ball diameter球

ISO 3290-1:2014

等级Grade球直径变动量Ball diameter variation球形偏差Deviation from spherical form球表面粗糙度Surfa

AFBMA-STANDARD 10-2001-USA

等级Grade球直径变动量Ball diameter variation球形偏差Deviation from spherical form球表面粗糙度Surfa

HARDNESS CONVERSION TABLE