| GENERAL CHARACTERISTICS ITEM DESCRIPTION | STEEL,ALLOY 4130,4140,SPEC ASTM A331,QUENCH AND TEMPER TO ROCKWELL C 26TO 32,21.167 IN. DIA,TAP DRILL THRU TAP 0.375-16 UNC 2B THREAD 0.469 IN. MIN FULL THREAD,COUNTERSINK AT 90 DEGREES OR C DRILL 0.410 DIA TIMES 0.060 DEEP,PITCH DIA 0.3344 M 0.3401 PIN.,2 HOLES TO BE WITHIN 0.005 IN. OF LOCATION SHOWN,12 LUGS EQUALLY SPACED 2.635 IN. APART |