5/8"-11 x 5" Stainless Steel 316 B8M Heavy Hex Head Cap Screw, Partial Thread, ASTM A193 Class 1

Manufactured from 316 stainless steel and meeting ASTM A193 Grade B8M, Class 1 specifications, the 5/8"-11 x 5" heavy hex head cap screw is designed for industrial fastening applications requiring high corrosion resistance and reliable mechanical performance. The partial‑thread (PT) configuration includes an unthreaded shank that enhances shear strength and promotes proper load transfer in bolted joints, making it well suited for flanged connections and thicker material assemblies. Its extended 5" length allows secure engagement through substantial components, while the heavy hex head provides increased bearing surface and improved wrench engagement for controlled torque application. Commonly used in marine environments, chemical processing equipment, pressure systems, and outdoor structural installations, this fastener delivers dependable performance and long service life in corrosive and moisture‑exposed conditions.