Technical Section TAPER PIPE THREAD :NPT ANSI/ASME B 1.20.1-1983 INTERNAL THREAD American National Standard Taper Pipe Threads THREAD PITCH PITCH PROFILE RECOMMENDED TOOLS SIZE TPI DEPTH INSERT TOOLHOLDER NPT 1/16 27 0.941 0.69 NPT27 IR06 HIR0012H06 NPT 1/8 27 0.941 0.69 NPT27 IR08 HIR0016K08 NPT 1/4 18 1.411 1.05 NPT18 IR08 HIR0016K08 NPT 3/8 18 1.411 1.05 NPT18 IR11 HIR0010K11 NPT 1/2 14 1.814 1.37 NPT14 IR16 HIR0013M16 NPT 3/4 14 1.814 1.37 NPT14 IR16 HIR0016P16 NPT 1 11.5 2.209 1.68 NPT11.5 IR16 HIR0020P16 NPT 1 1/4 11.5 2.209 1.68 NPT11.5 IR16 HIR0025R16 NPT 1 1/2 11.5 2.209 1.68 NPT11.5 IR16 HIR0032S16 NPT 2 11.5 2.209 1.68 NPT11.5 IR16 HIR0032S16 NPT 2 1/2 8 3.175 2.45 NPT8 IR16 HIR0040T16 NPT 3 8 3.175 2.45 NPT8 IR16 HIR0040T16 NPT 3 1/2 8 3.175 2.45 NPT8 IR16 HIR0040T16 NPT 4 8 3.175 2.45 NPT8 IR16 HIR0040T16 NPT 5 8 3.175 2.45 NPT8 IR16 HIR0040T16 TAPER PIPE THREAD :NPTF ANSI B 1.20.3-1976 INTERNAL THREAD American National Standard Dryseal Pipe Threads THREAD PITCH PITCH PROFILE RECOMMENDED TOOLS SIZE TPI DEPTH INSERT TOOLHOLDER NPTF 1/16 27 0.941 0.64 NPTF27 IR06 HIR0012H06 NPTF 1/8 27 0.941 0.64 NPTF27 IR08 HIR0016K08 NPTF 1/4 18 1.411 1.00 NPTF18 IR08 HIR0016K08 NPTF 3/8 18 1.411 1.00 NPTF18 IR11 HIR0010K11 NPTF 1/2 14 1.814 1.35 NPTF14 IR16 HIR0013M16 NPTF 3/4 14 1.814 1.35 NPTF14 IR16 HIR0016P16 NPTF 1 11.5 2.209 1.64 NPTF11.5 IR16 HIR0020P16 NPTF 1 1/4 11.5 2.209 1.64 NPTF11.5 IR16 HIR0025R16 NPTF 1 1/2 11.5 2.209 1.64 NPTF11.5 IR16 HIR0032S16 NPTF 2 11.5 2.209 1.64 NPTF11.5 IR16 HIR0032S16 NPTF 2 1/2 8 3.175 2.39 NPTF8 IR16 HIR0040T16 NPTF 3 8 3.175 2.39 NPTF8 IR16 HIR0040T16 71