Threading Inserts NPT EXTERNAL ANSI/ASME B 1.20.1-1983 B L A NPT NUT A 30° 30° I.C. L 90° 1°47' NPT SCREW B T I.C. VERTICAL STANDARD STANDARD PITCH CATALOG NUMBER DIMENSIONS RIGHT HAND LEFT HAND L I.C. A B TPI mm 27 NPT 27 ER11 NPT 27 EL11 0.7 0.8 18 NPT 18 ER11 NPT 18 EL11 0.8 1.0 11 6.35 14 NPT 14 ER11 NPT 14 EL11 0.8 1.0 27 NPT 27 ER16 NPT 27 EL16 0.7 0.8 18 NPT 18 ER16 NPT 18 EL16 0.8 1.0 14 NPT 14 ER16 NPT 14 EL16 0.9 1.2 16 9.525 11.5 NPT 11.5 ER16 NPT 11.5 EL16 1.1 1.5 8 NPT 8 ER16 NPT 8 EL16 1.3 1.8 MULTITOOTH PITCH DIMENSIONS CATALOG NUMBER TEETH ANVIL RIGHT HAND L TPI mm I.C. A B 11.5 2 NPT11.5 2M ER22 ES22M 22 12.70 2.4 3.4 11.5 3 NPT11.5 3M ER27 3.5 5.6 ES27M 27 15.875 8 2 NPT8 2M ER27 3.0 4.8 VERTICAL INSERTS PITCH CATALOG NUMBER DIMENSIONS RIGHT L I.C. A B T TPI HAND mm 27 NPT27 ER16V 1.1 0.8 3.7 18 NPT18 ER16V 1.1 1.0 3.7 16 9.525 14 NPT14 ER16V 1.1 1.2 3.7 11.5 NPT11.5 ER16V 1.1 1.5 3.7 28