Steel pin, cadmium plated, grip 0.3110 in. Min, 0.3120 in. Max dia, 0.438 in. Max lg, thd 0.312-24unjf-3a, 0.500 in. Min thd lg, head 490 in. Dia, hex. Socket bottom of shank 0.128 in. W across flats, cres collar, cadmium plated, thd 0.31 2-24unjf-3b, aluminum washer, anodized, 0.552 in. Od, 0.010 in. Thk