锤上钢质自由锻件机械加工余量与公差 轴类
Machining allowances and tolerances for steel open die forgings on hammer - Shafts
2008-02-28
GB/T 21470-2008
锤上钢质自由锻件机械加工余量与公差 盘、柱、环、筒类
Machining allowances and tolerances for steel open die forgings on hammer - Disks, columns, rings and seamless cylindrical sleeves
2008-02-28
GB/T 21469-2008
锤上钢质自由锻件机械加工余量与公差 一般要求
Machining allowances and tolerances for steel open die forgings on hammer - General requirement