Hex Head Cap Screw Head Type Hex Diameter 1/4 In. Grade 8 Material Alloy Steel Finish Plain Thread Size 1/4-20 Thread Type Coarse Length under Head 1-1/2 In. Thread Length 3/4 In. Head Height 5/32 In. Head Width 7/16 In. Thread Style Partially Threaded Thread Direction Right Hand Tensile Strength 150 000 psi Rockwell Hardness C33 to C39 Meets/Exceeds SAE J429 ASME B18.2.1 Refills 2EA47 Package Quantity 100