Socket Head Cap Screw Head Type Button Material Alloy Steel Black Oxide Finish Thread Size 20 Drive Type Hex Socket Drive Size 5/16 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 1/4 In. Thread Dia 1/4 In. Head Dia 3/8 In. Temp Range - 50 Degrees F to 550 Degrees F Rockwell Hardness 39 to 43 Min Tensile Strength 160 000 psi Meets/Exceeds ASTM A574 ANSI B18.3 Package Quantity 100