Threads G, RP, BSW, PG, NPT/NPTF, TR
Thread Types

G Whitworth Pipe threads
(BSP)

RP
Threads to DIN 2999

BSW
Whitworth Threads

PG
Steel conduit threads
DIN 40 430

NPTF
American taper pipe threads

TR
Metric ISO trapezoidal
coarse thread DIN 103