Threading Inserts API ROUND API SPEC 5B : 2008API Round NUT B A A B 30° 30° L L 90° 1°47' API Round SCREW I.C. I.C. INTERNAL EXTERNAL EXTERNAL PITCH TAPER CATALOG NUMBER DIMENSIONS TPI IPF RIGHT HAND Lmm I.C. A B 10 APIRD10 ER16 1.4 1.4 0.758 APIRD8 ER16 16 9.525 1.3 1.5 INTERNAL PITCH TAPER CATALOG NUMBER DIMENSIONS TPI IPF RIGHT HAND Lmm I.C. A B 10 APIRD10 IR16 1.4 1.4 0.75 16 9.525 8 APIRD8 IR16 1.3 1.5 MULTITOOTH PITCH CATALOG NUMBER CATALOG NUMBERTEETHEXTERNALINTERNAL DIMENSIONS TPI RIGHT HAND ANVIL RIGHT HAND ANVIL Lmm I.C. A B 10 2 APIRD10 2M ER22 ES22M APIRD10 2M IR22 IS22M 22 12.70 2.4 3.6 10 3 APIRD10 3M ER27 APIRD10 3M IR27 3.6 6.3 ES27M IS27M 27 15.875 8 2 APIRD8 2M ER27 APIRD8 2M IR27 2.9 4.6 48