
Y ER-NPTF X External NPTF (National Pipe Threads) l Full Profile Laydown Threading Inserts for Steam, Gas and Water Pipes di External right-hand shown NUT Dimensions Tough 1 Hard 30° 30° THREADING 90° 1°47' SCREW Designation di TPI l X Y Z IC50M IC250 IC908 11ER 18 NPTF 6.35 18.0 11.00 0.8 1.0 1 • 11ER 14 NPTF 6.35 14.0 11.00 0.8 1.0 1 • 16ER 27 NPTF 9.52 27.0 16.00 0.7 0.7 1 • • 16ER 18 NPTF 9.52 18.0 16.00 0.8 1.0 1 • 16ER 14 NPTF 9.52 14.0 16.00 0.9 1.2 1 • • • 16ER 11.5 NPTF 9.52 11.5 16.00 1.1 1.5 1 • • • For Insert Identification System, see page 489. • (National Pipe Threads-Dry Seal) ANSI/ASME B1.20.1-1976 full profile. • For technical information and detailed cutting data, see pages 536-546 For tools, see pages: C#-SER/L (530) • SER-D (530) • SER/L (529) Y IR/L-NPTF X Internal NPTF (National Pipe Threads) Full Profile Laydown Threading Inserts l for Steam, Gas and Water Pipes di Internal left-hand shown NUT Dimensions Tough 1 Hard 30° 30° 90° 1°47' SCREW Designation di TPI l R X Y IC228 IC250 IC908 06IR 27 NPTF 3.97 27.0 6.00 0.04 0.7 0.6 • 08IR 27 NPTF 4.76 27.0 8.00 0.04 0.6 0.6 • 08IR 18 NPTF 4.76 18.0 8.00 0.06 0.6 0.6 • 11IR 18 NPTF 6.35 18.0 11.00 0.06 0.8 1.0 • 11IRB 18 NPTF 6.35 18.0 11.00 0.06 0.8 0.9 • 11IR 14 NPTF 6.35 14.0 16.00 0.07 0.8 1.0 • 16IR 18 NPTF 9.52 18.0 16.00 0.06 0.8 1.0 • 16IR/L 14 NPTF 9.52 14.0 16.00 0.07 0.9 1.2 • • 16IR 11.5 NPTF 9.52 11.5 16.00 0.09 1.1 1.5 • • • For Insert Identification System, see page 489 • (National Pipe Threads-Dry seal) ANSI/ASME B1.20.1-1976. • For technical information and detailed cutting data, see pages 536-546 For tools, see pages: MGSIR/L (534) • SIR/L (531) Y R ER/L-BSPT X External BSPT (British Standard Pipe) B.S.21-1957 Full Profile l Laydown Threading Inserts di External right-hand shown R0.137P NUT Dimensions Tough 1 Hard 27.5° 90° R0.137P 1°47' SCREW Designation di TPI l R X Y IC50M IC250 IC508 IC808 IC908 IC1007 16ER 28 BSPT 9.52 28.0 16.00 0.11 0.6 0.6 • • 16ER/L 19 BSPT 9.52 19.0 16.00 0.16 0.8 0.9 • • • • 16ER/L 14 BSPT 9.52 14.0 16.00 0.21 1.0 1.2 • • • • • 16ERB 14 BSPT (1) 9.52 14.0 16.00 0.21 1.0 1.2 • 16ERM 14 BSPT (1) 9.52 14.0 16.00 0.21 1.0 1.2 • • • 16ER/L 11 BSPT 9.52 11.0 16.00 0.28 1.1 1.5 • • • 16ERB 11 BSPT (1) 9.52 11.0 16.00 0.28 1.1 1.5 • 16ERM 11 BSPT (1) 9.52 11.0 16.00 0.28 1.1 1.5 • • • For Insert Identification System, see page 489 • For threading between walls use insert TIP-BSPT. • For technical information and detailed cutting data, see pages 536-546 (1) With pressed chipformer. For tools, see pages: C#-SER/L (530) • SER-D (530) • SER/L (529) 512 ISCAR