Socket Head Cap Screw Head Type Button Material Alloy Steel Zinc-Plated 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 1-1/2 In. Thread Length 1-1/2 In. Head Height 1/4 In. Thread Dia 1/4 In. Head Dia 3/8 In. Temp Range -65 Degrees F to 300 Degrees F Rockwell Hardness C38 to C44 Min Tensile Strength 150 000 psi Meets/Exceeds ASTM F835/ANSI B18 Package Quantity 25