Threading J IntroductionThreading insertsMetricUnifiedParallel pipe, WhitworthExternal threadingInternal threadingExternal threadingInternal threadingExternal threadingInternal threadingJ2J8J8J9J10J11J12J13 Tapered pipe External threading J14 Internal threading J15 American national tapered pipe External threading J16 Internal threading J17 60° type (Partial profile/M, UN) External threading J18 Internal threading J19 55° type (Partial profile/G, R, Rc, W) External threading J20 Internal threading J21 EZ-Bar 30° type (Trapezoidal) External threading J22 for small internal Internal threading J23 machining applications ⇨ between chapter E Threading toolholders J24 and chapter F External toolholders KTN/KTN-JCT/KTNS J24 S-KTN J26 Internal toolholders SIN/CIN J27 Multipurpose threading tools J28 TKFT for small parts machining TKFT J28 KTKF J29 TTX for small parts machining TTX J30 KTTX/S-KTTX J31 TT for external and internal threading TT J32 KTT (external) J33 KITG (internal) J34 System Bar for micro internal threading VNT J35 TPGB for internal threading TPGB J36 S-STWP/S-STWP-E J36 Recommended cutting conditions J37 Depth of cut and number of passes J39 Applicable toolholders and inserts J48 Threading methods J52 Threading methods and basic profiles J52 Thread types J54 J1