Thread types and basic profiles TPGB for internal threading Thread types & basic profile / Applicable toolholders & inserts Basic profile Symbol Type Applicable inserts Applicable toolholders (Previous symbol) E ISO(-TF/TQ) KTN - ER 60(-TF/TQ) KTNSR -16 H 8 External 16ER60 S -KTNL16 H 2 Internal H1 M TT43E M KTT - H 30˚ 30˚ TT 60 d or D Metric H 2 60˚ TTX32R60 KTTXR -16F, S -KTTXL16 d2 or D2 H 4 External TP d1 or D1 I ISO(-TF/TQ) SIN S- (E) IR 60 Internal IR60 ( ) CIN S- e.g.) M30 TT 60 KITG T- TPGB11 ( ) S -STWP&11- (E) ER UN(-TF/TQ) KTNR - ER 60(-TF/TQ) KTNSR -16 External UN 16ER60 S -KTNL16 H 8 H 2 Internal UNC TT 60 KTT - H1 H TTX32R60 KTTXR -16F, S -KTTXL16 d or D Unified 30˚ 30˚ UNF 60˚ IR UN-(TF/TQ) H 2 UNEF SINR S- (E) d2 or D2 H 4 External IR 60 CINR S- d1 or D1 TP IR60 ( ) Internal e.g.) TT 60 KITG T- 3⁄4 -16 UNF TPGB11 ( ) S -STWP 11- (E) ER W(-TF/TQ) KTNR - H ER 55 6 External: G(PF) KTNSR -16 External r 16ER55 S -KTNL16 J H Internal: G(PF) 2 Internal Parallel pipe h d or D Rp(PS) TT 55 KTT - H 27.5˚ 27.5˚ r 55˚ TTX32R55 KTTXR -16F, S -KTTXL16 H 2 External IR W(-TF/TQ) d2 or D2 SINR S- (E) H 6 TP e.g.) IR 55 CINR S- Internal G 3⁄4 (PF 3⁄4) IR55 ( ) d1 or D1 TT 55 KITG T- Threading ER W(-TF/TQ) KTNR - ER 55 KTNSR -16 External H 6 16ER55 S -KTNL16 r W H 2 Internal TT 55 KTT - Whitworth H1 d or D H TTX32R55 KTTXR -16F, S -KTTXL16 0.0769H 27.5˚ 27.5˚ r IR W(-TF/TQ) H 2 55˚ SINR S- (E) IR 55 d2 or D2 External CINR S- H 6 Internal IR55 ( ) TP e.g.) D1 d1 or D1 W 3⁄8 TT 55 KITG T- KTNR - External: R(PT) 16ER BSPT(-TF/TQ) KTNSR -16 External (BSPT) S -KTNL16 r Internal Internal: Rc(PT) h 2 Tapered pipe * H 2 TT 55 KTT - (BSPT) h 27.5˚ 27.5˚ r TTX32R55 * KTTXR -16F, S -KTTXL16 H 55˚ IR BSPT(-TF/TQ) SINR S- (E) h 2 e.g.) CINR S- H 2 1˚47´ Internal External R 1⁄2 (PT 1⁄2) TP TT 55 * KITG T- fr American national tapered pipe KTNR - External Internal Fr NPT 16ER (. )NPT KTNSR -16 fc Fc S -KTNL16 Fc TP fc Internal Fr External SINR S- H 30˚30˚ 60˚ e.g.) 16IR (. )NPT h 1˚47´ CINR S- 3⁄8 -18 NPT fr KTNR - External 0.366TP Tr ER TR KTNSR -16 30˚ Trapezoidal H 2 S -KTNL16 Internal H1 H1 H1 2 2 15˚ 15˚ H 30˚ d or D External Internal SINR S- d2 or D2 H 2 0.366TP e.g.) IR TR d1 or D1 CINR S- 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