Threading MetricUnifiedParallel pipeWhitworthTapered pipeAmerican national tapered pipe30˚ Trapezoidal H H HHHHHH22H 22HHHHHHHH1482222HH16HH8H14HhH6660.0769HHH22HHHH22frfcfchfrH1H1H1h22 hh 22 d1 or D1 d2 or D2 d1 or D1d1 or D1d or D d1 or D1d2 or D2d2 or D2d1 or D1D1 d2 or D2d or Dd or Dd2 or D2 d or D d or D ExternalInternalExternalInternalExternalInternalExternalInternalExternalInternalExternalInternalExternalInternal Thread types and basic profiles TPGB for internal threading Thread types & basic profile / Applicable toolholders & inserts Basic profile Symbol(Previous symbol)Type Applicable inserts Applicable toolholders E ISO(-TF/TQ) KTN - ER 60(-TF/TQ) KTNSR -16 16ER60 S -KTNL16 Internal 30˚ 30˚ M TT43E MTT60 KTT - 60˚ TTX32R60 KTTXR -16F, S -KTTXL16 ExternalTP e.g.) I ISO(-TF/TQ)IR60IR60() SIN S- (E)CINS- M30 TT 60TPGB11 ( ) KITG T-S-STWP&11-(E) ER UN(-TF/TQ) KTNR - ER 60(-TF/TQ) KTNSR -16 UN 16ER60 S -KTNL16 Internal UNC TT 60 KTT - 30˚ 30˚ UNF TTX32R60 KTTXR -16F, S -KTTXL16 60˚ExternalTP UNEF IR UN-(TF/TQ)IR60IR60() SINR S- (E)CINRS- e.g.) TT 60 KITG T- 3⁄4 -16 UNF TPGB11 ( ) S -STWP 11- (E) ER W(-TF/TQ) KTNR - External: G(PF) ER 55 KTNSR -16 J r Internal Internal: G(PF) 16ER55 S -KTNL1627.5˚27.5˚r55˚Rp(PS)TT55TTX32R55KTT-KTTXR-16F, S-KTTXL16 ExternalTP IR W(-TF/TQ)e.g.)IR55G 3⁄4 (PF 3⁄4)IR55()SINRS- (E)CINRS- TT 55 KITG T- ER W(-TF/TQ) KTNR - ER 55 KTNSR -16 16ER55 S -KTNL16 r Internal W TT 55 KTT - 27.5˚ 27.5˚ TTX32R55 KTTXR -16F, S -KTTXL16 r55˚ExternalTP e.g.) IR W(-TF/TQ)IR55IR55() SINR S- (E)CINRS- W 3⁄8 TT 55 KITG T- External: R(PT) 16ER BSPT(-TF/TQ) KTNR -KTNSR-16 (BSPT)rInternal27.5˚27.5˚rInternal: Rc(PT)(BSPT)TT55*TTX32R55* S -KTNL16KTT -KTTXR-16F, S -KTTXL16 55˚ 1˚47 e.g.) IR BSPT(-TF/TQ) SINR S- (E)CINRS- ExternalTP R 1⁄2 (PT 1⁄2) TT 55 * KITG T- KTNR - Fr Internal NPT 16ER (. )NPT KTNSR -16 S -KTNL16 Fc Fc TP Fr 30˚ 30˚ 60˚ External e.g.)1˚47´ 16IR (. )NPT SINR S-CINRS- 3⁄8 -18 NPT KTNR - 0.366TP Tr ER TR KTNSR -16 S -KTNL16 Internal 15˚ 15˚ 30˚ External 0.366TP e.g.) IR TR SINR S-CINRS- TP Tr 26x3 Above shows the usage example of applicable Toolholder / Insert. * For the case when the thread root's corner-R(RE) can be smaller than the standard. J54