Features: BSPF (G SERIES) - British Standard Pipe BSPF (G Series); This series is a pipe thread which is used mainly for mechanical coupling. ; The angle of thread is mainly 55 however for the US method some threads have a 60 angle. It is specified according to JIS and ISO R228. ; TAPER TAPS have a lead of eight threads and are used as a starting tap in difficult or high precision holes. ; Specifications:Diameter1"Pitch11 tpiLeadTaperOverall Length96 mmTapping Drill30.5 mm