* Thread size refers to the nominal bore of the pipe Subtract approx 1/4″ (6mm) from thread diameter measurement for nominal pipe size BSPP BSPP male with conical 30° seat (60° included angle) seal against matching conical 30° seat of BSPP female swivel BSPP – Form B – Seals using a metal to Metal sealing EdgeAlso referred to as British Standard Taper Pipe or Pipe Taper, or Conical Thread Taper is 3/4" taper per foot ( 1 in 16 on the diameter) Various Symbols BSPT, BSPTr, PT, KR, Rc suggested tap drill sizes British Standard Pipe Parallel or Taper BSP or BSPT;Example Typical designation for Thread according ISO 228 ISO 228 G 3 1/4"
G3/8 thread gages