This standard specifies the structural type, dimensions, technical requirements and markings of cold heading GB 6170~6171 and GB 6175~6176 hexagonal nuts M8~M20 B type heading ball dies. This standard applies to the molds of automatic nut cold heading machines.
JB/T 4210.7-1996 history
2014JB/T 4210.5-2014 Cold heading dies for hexagon nuts.Part 5: Dies for ball upsetting
1996JB/T 4210.7-1996 Mold for cold heading hexagonal head nuts Upsetting barrel female die B type
JB/T 4210.7-1996 Mold for cold heading hexagonal head nuts Upsetting barrel female die B type was changed to JB/T 4210.5-2014 Cold heading dies for hexagon nuts.Part 5: Dies for ball upsetting.