Threading Inserts UN ( UNC, UNF, UNEF ) EXTERNAL ANSI B1.1-1982 UN NUT A L A B 1/4P 60° I.C. L 1/8P UN SCREW B T I.C. VERTICAL MULTITOOTH MULTITOOTH PITCH TEETH CATALOG NUMBERRIGHTHAND ANVIL LTPImm DIMENSIONSI.C. A B 20 2 UN20 2M ER16 1.4 2.1 16 2 UN16 2M ER16 ES16M 16 9.525 1.6 2.4 14 2 UN14 2M ER16 1.8 2.7 16 3 UN16 3M ER22 2.5 4.1 12 2 UN12 2M ER22 ES22M 22 12.70 2.1 3.3 12 3 UN12 3M ER22 3.2 5.2 8 2 UN8 2M ER27 ES27M 27 15.875 3.1 4.8 VERTICAL INSERTS PITCH CATALOG NUMBER DIMENSIONS TPI RIGHT HAND Lmm I.C. A B T 20 UN20 ER16V 1.1 0.8 3.7 16 UN16 ER16V 1.1 1.0 3.7 14 UN14 ER16V 16 9.525 1.1 1.2 3.7 12 UN12 ER16V 1.1 1.3 3.7 14