| GENERAL CHARACTERISTICS ITEM DESCRIPTION | STEEL ALLOY,ASTM A331-74,4140,COLD FINISHED,0.15-0.35 PER CENT LEAD PERMITTED; SURFACE ROUGHNESS IS 125.000 MICROINCHES; HEAT TREATMENT: MIL-H-6875,QUENCH AND TEMPER TO 23-32 ROCKWELL C,INDUCTION HARDEN AREA INDICATED ONLY TO 45-50 ROCKWELL C FROM 0.06 TO 0.25 IN. DEEP; MANGANESE PHOSPHATE,MIL-P-16232,TYPE M,CLASS 1; 3.570 IN. LG.; 2.770 IN. DIA.; 3 EQUALLY SPACED HOLES,0.285 IN. DIA. |