Socket Head Cap Screw Head Type Standard Material Alloy Steel Black Oxide Finish Thread Size 18 Drive Type Hex Socket Drive Size 1/4 In. Thread Type Coarse Thread Style Fully Threaded Thread Direction Right Hand Length under Head 3/8 In. Thread Length 3/8 In. Head Height 5/16 In. Thread Dia 5/16 In. Head Dia 7/16 In. Temp Range -65 Degrees F to 300 Degrees F Rockwell Hardness C39 Min Tensile Strength 180 000 psi Package Quantity 100