Partial profilePartial profileFull profilePartial profileFull profilePartial profilePartial profilePartial profile Threading Introduction  Tooling application table (Internal thread) Metric Unified Parallel pipe Whitworth Tapered pipe American nationaltapered pipe30˚ trapezoidal Thread types M UN, UNC G(PF)UNF, UNEFRp(PS) W Rc(PT)(BSPT) NPT Tr Internal Internal Internal Internal Internal Internal Internal 1˚47' 1˚47' 30˚ Thread shape 60˚ 60˚ 55˚ 55˚ 55˚ 60˚ TP TP TP TP TP TP TP External External External External External External External Pitch mm TPI TPI TPI TPI TPI mm Toolholder shape (check EZ Bar special supplement, page 13) EZT 0.5~1.75 36~16 28~19 24~18 28~19 18~14 - VNT 0.75~1.5 28~18 - - - - - J SIN 0.5~5.0 24~8 19~11 16~11 28~11 18~11.5 - 0.5~5.0 48~5 28~11 40~5 28~11 - 2.0~5.0 CIN 1.0~5.0 24~8 19~11 16~11 14~11 18~11.5 - 0.5~5.0 48~5 28~11 40~5 28~11 - 2.0~5.0 KITG 0.5~3.0 48~8 28~11 24~8 28~11 - - STWP 0.75~3.5 28~8 - - - - - For parallel pipe and tapered pipe, the average values are only to be used if specifically recommendation. J5