1‑1/8"-8 x 4" Stainless Steel 304 B8 Heavy Hex Head Cap Screw, Partial Thread, ASTM A193 Class 1

This 1‑1/8"-8 x 4" heavy hex head cap screw is manufactured from Type 304 stainless steel and meets ASTM A193 Grade B8, Class 1 specifications, providing dependable strength and corrosion resistance for large‑diameter industrial and structural fastening applications. The partial‑thread (PT) design incorporates a long, smooth shank that enhances shear strength and improves load transfer in high‑stress bolted joints, making it especially effective for flanged connections and thick structural assemblies. Its 4" length supports secure fastening through substantial material sections, while the heavy hex head offers increased bearing surface and superior wrench engagement for controlled torque application. Commonly used in piping systems, pressure equipment, structural steel connections, and heavy fabrication, this fastener delivers reliable resistance to rust, oxidation, and environmental exposure for long‑term service in indoor, outdoor, and moderately corrosive environments.