Socket Head Cap Screw Head Type Button Material Carbon Steel Black Oxide Finish Thread Size 28 Drive Type Hex Socket Drive Size 5/16 In. Thread Type Fine Thread Style Fully Threaded Thread Direction Right Hand Length under Head 2 In. Thread Length 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 C37 to C44 Min Tensile Strength 135 000 psi Meets/Exceeds ASME B18.3 Package Quantity 50