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

Manufactured from 316 stainless steel and certified to ASTM A193 Grade B8M, Class 1, the 1‑1/4"-7 x 4" heavy hex head cap screw is designed for corrosion‑resistant fastening in high‑strength industrial and structural applications. The partial‑thread (PT) design incorporates an unthreaded shank that improves shear strength and ensures proper load distribution in high‑stress bolted joints, making it particularly effective for flanged connections and thick material assemblies. Its 4" length provides secure engagement through substantial components, while the heavy hex head delivers increased bearing surface and enhanced 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.