These screws are manufactured with alloy steel, which contains elements to help the screws become more responsive to heat and mechanical treatments. System of Measurement / Inch Cap Screw Type / Hex Head Cap Screw Basic Material / Steel Material Grade / B7 Fastener Finish / Plain Dia./Thread Size / 3/8"-16 Fastener Length / 1 3/4 in Fastener Thread Direction / Right Hand Fastener Thread Type / UNC (Coarse) Fastener Thread Style / Partially Threaded Fastener Industry Standards / ASME B18.2.1 Head Type / Hex Min. Thread Length / 1 in Head Height / 15/64 in Head Width / 0.5625 in Tensile Strength / 125,000 psi Rockwell Hardness / C35