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