1‑1/4"-7 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 compliant with ASTM A193 Grade B8M, Class 1, the 1‑1/4"-7 x 4‑1/2" heavy hex head cap screw is designed for corrosion‑resistant fastening in high‑load industrial and structural applications. The partial‑thread (PT) configuration features an extended unthreaded shank that enhances shear strength and promotes proper load transfer across heavily stressed bolted joints, making it especially suitable for flanged connections and thick material assemblies. Its 4‑1/2" length provides solid engagement through substantial components, while the heavy hex head delivers increased bearing surface and superior wrench leverage for controlled, high‑torque installation. Commonly specified for marine environments, chemical processing equipment, pressure systems, and outdoor structural installations, this fastener offers dependable performance and long service life in corrosive and moisture‑exposed conditions.