1‑1/8"-8 x 4‑1/2" Stainless Steel 304 B8 Heavy Hex Head Cap Screw, Partial Thread, ASTM A193 Class 1

This 1‑1/8"-8 x 4‑1/2" heavy hex head cap screw is manufactured from 304 stainless steel and meets ASTM A193 Grade B8, Class 1 requirements, providing dependable corrosion resistance and mechanical strength for large‑diameter industrial fastening applications. The partial‑thread (PT) configuration features a long, unthreaded shank that improves shear performance and ensures proper alignment in high‑load bolted joints, making it well suited for flanged connections, pressure equipment, and thick structural assemblies. Its extended 4‑1/2" length allows secure fastening through substantial material stacks, while the heavy hex head delivers increased bearing surface and enhanced wrench engagement for controlled torque application. Commonly used in piping systems, structural steel installations, and heavy equipment fabrication, this fastener offers reliable resistance to rust, oxidation, and environmental exposure for long‑term service in indoor, outdoor, and moderately corrosive environments.