The knowledge of the threading dies

Material :

1.Alloy dies:

2.HSS dies: (High-Speed Steel) 

Thread type:

BSPT: British Standard Pipe Taper 

BSPP: British Standard Pipe Parallel 

NPT: National Pipe Taper  

NPSM: National Pipe Straight Mechanical

ISO: International Standards Organization ,Metric threads.

Market:

BSPT，widely use in Asian,Middle East,Europ,Africa.

NPT，widely use America country

BSPP，Russia