Foreverbolt® fasteners were designed over the last 15 years with NL-19®. - NL-19 is Foreverbolt’s proprietary lab-tested process that alters the surface of stainless steel fasteners to produce a brighter finish, 1.9% increase in strength, and superior corrosion resistance. System of Measurement / Inch Cap Screw Type / Hex Head Cap Screw Basic Material / Stainless Steel Material Grade / 316 Fastener Finish / NL-19(SM) Dia./Thread Size / 3/8"-16 Fastener Length / 2 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 / 85,000 to 150,000 psi Rockwell Hardness / B80 to C32