DIN V 4001-202
CAD standard parts file; specifications of geometry and parameters; bolts with head, close tolerance, with plain sitting surface, with drive external by tool
CAD标准件文件；几何和参数的规格；螺栓头 紧公差 平座面 外部工具驱动
1989-04-01
DIN V 4001-204
CAD standard parts file; specifications of geometry and parameters; bolts with head, close tolerance, with plain sitting surface, with drive internal by tool
CAD标准件文件；几何和参数的规格；带螺栓头、紧公差、平座面、内部工具驱动的螺栓
1990-04-01