Socket Head Cap Screw Head Type Flat Material Alloy Steel Black Oxide Finish Thread Size 40 Drive Type Hex Socket Drive Size 1/16 In. Thread Type Coarse Thread Style Fully Threaded Thread Direction Right Hand Length under Head 5/16 In. Thread Length 5/16 In. Head Height 3/32 In. Thread Dia #4 Head Dia 1/4 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