HI Thread Insert Thread Insert HI British Standard Pipe Thread ( BSPT) National Pipe Thread ( NPT) Pitch Dimensions Pitch Dimensions CD 0 CL Designation Designation CL Designation Designation Picture Picture (Right) ( Left ) (tpi) d L hmin x f (Right) ( Left ) (tpi) d L hmin x f ER 11 - 28BSPT EL 11 28BSPT - 28 6.35 11 0.58 0.6 0.6 ER 11 - 27NPT EL 11 - 27NPT 27 6.35 11 0.66 0.7 0.8 11 19BSPT - 11 - 19BSPT 19 6.35 11 0.86 0.8 0.9 11 - 18NPT 11 - 18NPT 18 6.35 11 1.01 0.8 1.0 11 - 14BSPT 11 14BSPT - 14 6.35 11 1.16 0.9 1.0 R 0.137 P Internal 11 - 14NPT 11 - 14NPT 14 6.35 11 1.33 0.8 1.0 CD c 27.93 27.93 CD c 16 - 28BSPT 16 - 28BSPT 28 9.525 16 0.58 0.6 0.6 16 - 27NPT 16 - 27NPT 27 9.525 16 0.66 0.7 0.8 0 0 L L x 16 - 19BSPT 16 19BSPT - 19 9.525 16 0.86 0.8 0.9 x 16 - 18NPT 16 - 18NPT 18 9.525 16 1.01 0.8 1.0 LU LU 16 - 14BSPT 16 - 14BSPT 14 9.525 16 1.16 1.0 1.2 903. / R 0.137 F 16 - 14NPT 16 - 14NPT 14 9.525 16 1.33 0.9 1.2 Externa 16 - 11 BSPT 16 - 11 BSPT 11 9.525 16 1.48 1.1 1.5 16 - 11.5NPT 16 - 11.5NPT 11.5 9.525 16 1.64 1.1 1.5 16 - 8NPT 16 - 8NPT 8 9.525 16 2.42 1.3 1.8 IR 11 - 28BSPT IL 11 - 28BSPT 28 6.35 11 0.58 0.6 0.6 IR 11 - 27 NPT IL 11 - 27NPT 27 6.35 11 0.66 0.7 0.8 11 - 19BSPT 11 - 19BSPT 19 6.35 11 0.86 0.8 0.9 f 11 - 18NPT 11 - 18NPT 18 6.35 11 1.01 0.8 1.0 x x 11 - 14BSPT 11 - 14BSPT 14 6.35 11 1.16 0.9 1.0 11 - 14NPT 11 - 14NPT 14 6.35 11 1.33 0.8 1.0 CD R 0.137 P Internal CD c c 16 - 28BSPT 16 - 28BSPT 28 9.525 16 0.58 0.6 0.6 27.93 27.53 16 - 27NPT 16 - 27NPT 27 9.525 16 0.66 0.7 0.8 0 0 c 16 - 1 9BSPT 16 - 19BSPT 19 9.525 16 0.86 0.8 0.9 L c 16 - 18NPT 16 - 18NPT 18 9.525 16 1.01 0.8 1.0 16 - 14BSPT 16 - 14BSPT 14 9.525 16 1.16 1.0 1.2 / R 0.137 F 16 - 14NPT 16 - 14NPT 14 9.525 16 1.33 0.9 1.2 9 - Nfcf 16 - 11 BSPT 16 - 11 BSPT 11 9.525 16 1.48 1.1 1.5 ^ Externa 16 - 11.5NPT 16 - 8NPT 16 - 11.5NPT 16 - 8NPT 11.5 8 9.525 9.525 16 16 1.64 2.42 1.1 1.3 1.5 1.8 037 038 National Pipe Thread (V Style) Pitch Dimensions 0 Q. Designation Designation Picture (Right) ( Left ) (tpi) d L hmin x f t British Standard Pipe Thread (V Style) VER 11 - 27NPT VEL 11 - 27NPT 27 6.35 11 0.66 0.70 2.0 3.2 Pitch Dimensions 0 11 - 18NPT 11 - 18NPT 18 6.35 11 1.01 0.70 1.8 3.2 Q. Designation Designation CD Picture c (Right) ( Left ) ( tpi) d L hmin x f t 11 - 14NPT 11 - 14NPT 14 6.35 11 1.33 0.70 1.8 3.2 0 x 16 - 27NPT 16 - 27NPT 27 9.525 16 0.66 1.10 2.9 3.6 LU VER 16 - 28BSPT VEL 16 - 28BSPT 28 9.525 16 0.58 1.10 3.0 3.6 16 - 18NPT 16 - 18NPT 18 9.525 16 1.01 1.10 2.6 3.6 CD c 16 - 19BSPT 16 - 19BSPT 19 9.525 16 0.86 1.10 2.7 3.6 16 - 11.5NPT 16 - 11.5NPT 11.5 9.525 16 1.64 1.10 2.1 3.6 t 0 x 16 - 14BSPT 16 - 14BSPT 14 9.525 16 1.16 1.10 2.4 3.6 LU 16 - 11 BSPT 16 - 11 BSPT 11 9.525 16 1.48 1.10 2.1 3.6 1" 47’ / RD. 137P Externa *