1‑1/4"-8 x 3‑1/2" Stainless Steel 316 B8M Heavy Hex Head Cap Screw, Full Thread, ASTM A193 Class 1

Manufactured from 316 stainless steel and meeting ASTM A193 Grade B8M, Class 1 specifications, the 1‑1/4"-8 x 3‑1/2" heavy hex head cap screw is designed for corrosion‑resistant fastening in high‑strength industrial and structural applications. The full‑thread (FT) configuration provides continuous thread engagement along the entire shank, supporting uniform clamping force and dependable joint integrity where consistent load distribution is required. The heavy hex head offers a larger bearing surface and enhanced wrench engagement compared to standard hex heads, allowing precise torque control during installation. Commonly specified for marine environments, chemical processing equipment, pressure systems, and outdoor structural assemblies, this fastener delivers reliable performance and long service life in corrosive and moisture‑exposed conditions.