Socket Head Cap Screw Head Type Low Material Alloy Steel Black Oxide Finish Thread Size 20 Drive Type Hex Socket Drive Size 1/8 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 33 to 39 Min Tensile Strength 150 000 psi Meets/Exceeds ASTM A574 Package Quantity 100