HI Thread Insert Thread Insert HI British Standard Pipe Thread ( BSPT ) ( M Chip Breaker ) National Pipe Thread ( NPT ) ( M Chip Breaker ) Pitch Dimensions Pitch Dimensions CD CD CL Designation Designation CL Designation Designation Picture Picture (Right) ( Left ) ( tpi) d L hmin x f (Right ) ( Left ) ( tpi) d L hmin x f ERM 16 - 14 BSPT 14 9.525 16 1.16 1.0 1.2 f ERM 16 - 14 NPT 14 9.525 16 1.33 0.9 1.2 f 16 - 11 BSPT 11 9.525 16 1.48 1.1 1.5 X R 0.137P Internal 16 -11.5 NPT 11.5 9.525 16 1.64 1.1 1.5 X 03 55° 03 c c 16 - 8 NPT 8 9.525 16 2.42 1.3 1.8 CD t CD / h / X t X L±J LU R 0.137P ii External d d Pitch Dimensions Pitch Dimensions CD CD CL Designation (Right) Designation ( Left ) ( tpi) d L hmin x f Picture CL > . Designation (Right ) Designation ( Left ) ( tpi) d L hmin x f Picture IRM 16 - 14 BSPT 14 9.525 16 1.16 1.0 1.2 IRM 16 - 14 NPT 14 9.525 16 1.33 0.9 1.2 f 16 - 11 BSPT 11 9.525 16 1.48 1.1 1.5 R 0.137P Internal 16 -11.5 NPT 11.5 9.525 16 1.64 1.1 1.5 03 55° 03 c c 16 - 8 NPT 8 9.525 16 2.42 1.3 1.8 CD t CD h X t X LU LU R 0.137P External 039 040 British Standard Pipe Thread ( BSPT ) ( U Chip Breaker ) National Pipe Thread ( NPT ) ( U Chip Breaker ) Pitch Dimensions Pitch Dimensions CD CD CL Designation Designation CL Designation Designation Picture Picture (Right) ( Left ) ( tpi) d L hmin x f (Right ) ( Left ) ( tpi) d L hmin x f ERU 16 - 14 BSPT 14 9.525 16 1.16 1.0 1.2 ERU 16 -14 NPT 14 9.525 16 1.33 0.9 1.2 x- r 16 - 11 BSPT 11 9.525 16 1.48 1.1 1.5 R 0.137P Internal 16 -11.5 NPT 11.5 9.525 16 1.64 1.1 1.5 03 27.5° 27.5° 03 c c 16 - 8 NPT 8 9.525 16 2.42 1.3 1.8 CD CD h X T X LU LU 90 ^ \ -T47 7External 'R 0.137P Pitch Dimensions Pitch Dimensions CD CD Q . Designation Designation Q. Designation Designation Picture Picture (Right) ( Left ) ( tpi) d L hmin x f (Right ) ( Left ) ( tpi) d L hmin x f IRU 16 - 14 BSPT 14 9.525 16 1.16 1.0 1.2 IRU 16 - 14 NPT 14 9.525 16 1.33 0.9 1.2 r -X 16 - 11 BSPT 11 9.525 16 1.48 1.1 1.5 R 0.137P Internal 16 -11.5 NPT 11.5 9.525 16 1.64 1.1 1.5 03 27.5° 27.5° 03 c c 16 - 8 NPT 8 9.525 16 2.42 1.3 1.8 CD CD h X t X LU LU ^ \ f47 7External R 0.137P 90 '