Home / Standards / JB/T 6644-1993 JB/T 6644-1993 Abolished 滚动轴承 滚针和双向推力圆柱滚子 组合轴承尺寸和公差 Standard Type JB ICS N/A CCS N/A Status Abolished Issue Date 1993-05-07 Implementation 1994-01-01 Centralized Committee 机械工业部 Issuing Authority 机械工业部