Pipe industry

USA

Solid carbide thread mills

National Pipe Taper 60° : NPT – NPTF
Straight Pipe Mechanical : NPSM
Straight Pipe : NPSF – NPSI
British Straight Whitworth : BSW
British Straight Pipe : BSP – G – Rp – BSF
British Pipe Taper : BSPT – R
Knuckle thread : RD
Electric tube  thread : PG

Thread mill inserts

Straight Pipe Mechanical : NPSM
Straight Pipe : NPSF – NPSI

Triangular threading inserts

Pipe thread : API       RD