Threading Inserts AMERICAN BUTTRESS EXTERNAL ANSI B 1.9-1973ABUT NUT0.16316P A B 45° 7° I.C. L 0.16316P ABUT SCREW PITCH CATALOG NUMBER DIMENSIONS TPI RIGHT HAND LEFT HAND L mm I.C. A B 20 ABUT 20 ER11 ABUT 20 EL11 1.0 1.4 11 6.35 16 ABUT 16 ER11 ABUT 16 EL11 1.1 1.6 20 ABUT 20 ER16 ABUT 20 EL16 1.0 1.4 16 ABUT 16 ER16 ABUT 16 EL16 1.0 1.5 12 ABUT 12 ER16 ABUT 12 EL16 16 9.525 1.4 2.0 10 ABUT 10 ER16 ABUT 10 EL16 1.5 2.3 8 ABUT 8 ER22 ABUT 8 EL22 2.0 3.2 22 12.70 6 ABUT 6 ER22 ABUT 6 EL22 2.1 3.4 STANDARD LEADING ANGLE: 45° 38