This standard specifies the structural type and size, technical requirements and markings of cold heading GB 6170~6171 and GB 6175~6176 hexagonal nut M8~M12 B type heading ball punches. This standard applies to the molds of automatic nut cold heading machines.
JB/T 4210.5-1996 history
2014JB/T 4210.4-2014 Cold heading dies for hexagon nuts.Part 4: Punches for ball upsetting
1996JB/T 4210.5-1996 Mold for cold heading hexagonal head nuts Upsetting barrel punch pin B type
JB/T 4210.5-1996 Mold for cold heading hexagonal head nuts Upsetting barrel punch pin B type was changed to JB/T 4210.4-2014 Cold heading dies for hexagon nuts.Part 4: Punches for ball upsetting.