7steel, corrosion resistant, qq-s-763, class 440 c, condition a, 1.988 in. Min., 1.990 in. Max. O/a dia, 0.340 in. O/a h, passivate per mil-s-5002, magnetic particle inspect per mil-h-6868, heat treat per mil-h-6875 to rockwell hardness c scale 56 min, 60 max