Threading Inserts AMERICAN BUTTRESS INTERNAL ANSI B 1.9-1973ABUT NUT0.16316P B A 45° 7° I.C. L 0.16316P ABUT SCREW PITCH CATALOG NUMBER DIMENSIONS TPI RIGHT HAND LEFT HAND Lmm I.C. A B 20 ABUT 20 IR11 ABUT 20 IL11 1.0 1.4 11 6.35 16 ABUT 16 IR11 ABUT 16 IL11 1.1 1.6 20 ABUT 20 IR16 ABUT 20 IL16 1.0 1.4 16 ABUT 16 IR16 ABUT 16 IL16 1.0 1.5 16 9.525 12 ABUT 12 IR16 ABUT 12 IL16 1.4 2.0 10 ABUT 10 IR16 ABUT 10 IL16 1.5 2.3 8 ABUT 8 IR22 ABUT 8 IL22 2.0 3.2 22 12.70 6 ABUT 6 IR22 ABUT 6 IL22 2.1 3.4 STANDARD LEADING ANGLE: 45° 39