MRC:
A recording of the physical,functional,and performance characteristics for an item of supply.TEXT
General Description:
Steel alloy, mil-s-18720, type 4130or qq-s-624, cold finish, 0.15-0.35 per cent lead permitted, type 4340; surfaceroughness is 125.000 microinches; manganese phosphate, mil-p-16232, type m, class 1 or zinc phosphate, mil-p-16232, type z, class 1; heat treatment: mil-h-6875, quench and temper to 30-35 rockwell c; 5.180 in. W.; 0.500 in thk.; 1 hole1.485 in. Dia.; 1 hole 1.035 in. Dia.; 1 hole 1.085 in. Dia. And csk. To 1.345 in. And 60.5 deg.
