7/8"-9 x 4‑1/2" Stainless Steel 316 B8M Heavy Hex Head Cap Screw, Partial Thread, ASTM A193 Class 1

Manufactured from 316 stainless steel and produced to ASTM A193 Grade B8M, Class 1, the 7/8"-9 x 4‑1/2" heavy hex head cap screw is engineered for corrosion‑resistant fastening in high‑load industrial and structural applications. The partial‑thread (PT) configuration features an extended unthreaded shank that improves shear strength and ensures effective load transfer in stressed bolted joints, making it ideal for flanged connections and thick material assemblies. Its 4‑1/2" length provides added reach for deep engagement, while the heavy hex head delivers increased bearing surface and enhanced wrench engagement for controlled, high‑torque installation. Commonly specified for marine environments, chemical processing equipment, pressure systems, and outdoor structural assemblies, this fastener offers dependable performance and long service life in corrosive and moisture‑exposed conditions.