Socket Head Cap Screw Head Type Standard Material Alloy Steel Black Oxide Finish Thread Size 24 Drive Type Hex Socket Drive Size 1/4 In. Thread Type Coarse Thread Style Partially Threaded Thread Direction Right Hand Length under Head 2 In. Thread Length 1-3/8 In. Head Height 5/16 In. Thread Dia 5/16 In. Head Dia 7/16 In. Temp Range - 20 Degrees F to 400 Degrees F Rockwell Hardness HRC 39 to 45 Min Tensile Strength 180 000 psi Meets/Exceeds ASTM A574 ASME B18.3