Introduction  Tooling application table (External thread) American national Metric Unified Parallel pipe Whitworth Tapered pipe 30˚ trapezoidal tapered pipe Thread types UN, UNC R(PT) M G(PF) W NPT Tr UNF, UNEF (BSPT) 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 KTN Full profile (KTN-JCT) 0.5~5.0 24~8 19~11 16~11 28~11 18~11.5 - (0.5~3.0) (24~8) (19~11) (16~11) (28~11) (18~11.5) Partial profile 0.5~5.0 48~5 28~11 40~5 28~11 2.0~5.0 - (0.5~3.0) (48~8) (28~11) (40~8) (28~11) (2.0~3.0) KTNS Full profile 0.5~3.0 24~8 19~11 16~11 28~11 18~11.5 - J Partial profile 0.5~3.0 48~8 28~11 40~8 28~11 - 2.0~3.0 Sleeve holder S-KTN KTT Full profile Threading 1.0~2.0 - - - - - - Partial profile 0.5~3.5 56~8 28~11 24~7 28~11 - - KTTX Partial profile 0.5~2.0 56~14 28~11 24~11 28~11 - - S-KTTX Partial profile 0.5~2.0 56~14 28~11 24~11 28~11 - - KTKF Partial profile KTKF 0.2~1.5 64~18 28~19 40~16 28~19 - - (Goose-neck holder) Pitch inside ( ) indicates KTN-JCT. J4