Socket Head Cap Screw Head Type Button Material Alloy Steel Black Oxide Finish Thread Size 16 Drive Type Hex Socket Drive Size 5/16 In. Thread Type Coarse Thread Style Fully Threaded Thread Direction Right Hand Length under Head 5/8 In. Thread Length 5/8 In. Head Height 3/8 In. Thread Dia 3/8 In. Head Dia 9/16 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