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

This 1"-8 x 4" heavy hex head cap screw is manufactured from Type 304 stainless steel and produced to ASTM A193 Grade B8, Class 1, making it suitable for high‑load industrial and structural fastening applications where corrosion resistance is required. The partial‑thread (PT) configuration features an extended unthreaded shank that improves shear performance and promotes proper alignment in bolted joints, especially in flanged connections and thick structural assemblies. Its 4" length allows secure fastening through substantial material sections, while the heavy hex head provides increased bearing surface and enhanced wrench engagement for controlled torque application. Commonly used in piping systems, pressure connections, equipment supports, and heavy fabrication, this stainless fastener offers dependable resistance to rust, oxidation, and environmental exposure for long‑term service in indoor, outdoor, and moderately corrosive environments.