Machining > Threading > Tap Sets | Bordo BSPF Tap Set HSS Hand and Machine Tap - 3046 | Bordo BSPF Tap Set HSS Hand and Machine Tap - 3046 | HSS BSPF Hand and Machine Tap Set. | British Standard Pipe (G 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. | Bottoming Taps have a lead of two threads and are used to ensure minimum thread run-out when tapping to the bottom of a blind hole. | Intermediate Taps have a lead of four threads and are used in most general purpose applications to cut a thread true to a pre-drilled pilot hole. | Taper Taps have a lead of eight threads and are used as a starting tap in difficult or high precision holes. | Manufactured from HSS this general purpose tap is designed for use in medium tensile materials and is for hand or general machine use.