GENERAL CHARACTERISTICS ITEM DESCRIPTION | STEEL,GRADE 4140 OR 4150,ASTM A322,OR ASTM A331,OR STEEL,GRADE 4140 H,ASTM A519; HEAT TREATMENT= HEAT AT 1535-1565 DEG. F.,OIL QUENCH,TEMPER,IMMEDIATELY FOR 1 HR. AT HEAT TO HARDNESS SPECIFIED; MANGANESE PHOSPHATE,TYPE M,PER MIL-P-16232,CLASS 1; 5.868 IN. LG. |