1‑1/8"-8 x 6‑1/2" Stainless Steel 316 B8M Heavy Hex Head Cap Screw, Partial Thread, ASTM A193 Class 1

Manufactured from 316 stainless steel and produced in accordance with ASTM A193 Grade B8M, Class 1, the 1‑1/8"-8 x 6‑1/2" heavy hex head cap screw is intended for large‑diameter, high‑load fastening applications where corrosion resistance and structural reliability are essential. The partial‑thread (PT) design features a long unthreaded shank that enhances shear strength and promotes efficient load transfer in heavily stressed bolted joints, making it well suited for flanged connections and thick structural assemblies. Its 6‑1/2" length provides deep, secure engagement through substantial material sections, 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 delivers dependable performance and long service life in corrosive and moisture‑exposed conditions.