Socket Head Cap Screw Head Type Standard Material Alloy Steel Black Oxide Finish Thread Size 24 Drive Type Hex Socket Drive Size 5/16 In. Thread Type Coarse Thread Style Partially Threaded Thread Direction Right Hand Length under Head 4-3/8 In. Thread Length 7/8 In. Head Height 1/16 In. Thread Dia #10 Head Dia 5/16 In. Temp Range - 20 Degrees F to 400 Degrees F Rockwell Hardness C39 to C45 Min Tensile Strength 180 000 psi Meets/Exceeds ASTM A574/ANSI B 18.3