Flange Bolts, Basic Material Steel, Material Grade Alloy Steel, Fastener Finish Plain, Dia./Thread Size 5/16 In.-18, Fastener Length 3/4 in, Fastener Thread Direction Right Hand, Fastener Thread Type UNC (Coarse), Fastener Thread Style Fully Threaded, Fastener Industry Standards ASTM A574, IFI-115, Thread Length 3/4 in, Head Height 5/16 in, Head Width 5/16 in, Flange Dia. 15/32 in, Proof Load 140,000 psi, Tensile Strength 170,000 psi, Rockwell Hardness HRC37, Package Quantity 50