THREADING ISO Metric / American UNParallel Pipe ThreadWhitworth for BSW, BSPAmerican NPTAPI Round Casing & TubingAPI Buttress Casing 0.866025P 0.433013P0.433013PH 0.108253P0.541266P0.216506PScshsSrs0.0328P0.866025P 0.0328P0.0328P0.8P0.0328P 1.78° Snh1Sc1 BSPTRound DIN405ISO Trapezoidal 30°American ACME 1.8660P1.9334P 0.25P0.933P0.933P 0.5P0.5P0.5P 0.25P 0.25P0.25P 0.25P 0.05P 0.05P 0.5P 0.238507P 0.221047P 0.255967P THREADING STANDARD THREAD AND CORRESPONDING INSERT ThreadName Standard Thread Type Symbol Thread Name Standard Thread Type Symbol 0.125P FemaleThread BSPT FemaleThread M30°30°UNC60°UNFMale Thread R(PT)Rc(PS) P Rp Axis 30° FemaleThread Female Thread WG 0.238507P Rd (PF) Male Thread Male Thread P G Female Thread 0.366P 0.038P Female Thread 0.038P PAxis0.038P90° NPT Tr15°15°30°(TM) Male Thread 0.038P 30° 30°60° 0.366P Male Thread P taper shown exaggeratedP Female29°Thread 14.5° 14.5° Frs p/2 30° 30° 60° Pitch line CSGLCSG Fcn ACMEFcs(Tw) Frn 90° taper = 3/4 in. per it. (62.5 mm per m) on daimeter P MaleThread B(NR) B(ER) BCSG 1.78° 10° 3° parallel to taper G008