This part of JB/T 4210 specifies the structural type and size, material and hardness, requirements and markings of the heading punch of the hexagonal nut cold heading die. This section applies to hexagonal nut cold heading dies for automatic nut cold heading machines.
GB/T 6176-2000 Hexagon nuts,style 2,with fine pitch thread
JB/T 4213 Cold heading dies for fasteners.Specifications
JB/T 4210.4-2014 history
2014JB/T 4210.4-2014 Cold heading dies for hexagon nuts.Part 4: Punches for ball upsetting
1996JB/T 4210.4-1996 Mold for cold heading hexagonal head nuts Upsetting barrel punch pin A type
JB/T 4210.4-2014 Cold heading dies for hexagon nuts.Part 4: Punches for ball upsetting has been changed from JB/T 4210.5-1996 Mold for cold heading hexagonal head nuts Upsetting barrel punch pin B type.