1‑1/8"-8 x 5‑1/2" Stainless Steel 304 B8 Heavy Hex Head Cap Screw, Partial Thread, ASTM A193 Class 1

This 1‑1/8"-8 x 5‑1/2" heavy hex head cap screw is manufactured from Type 304 stainless steel and produced to ASTM A193 Grade B8, Class 1, making it a dependable fastener for large‑diameter industrial and structural applications requiring corrosion resistance and strength. The partial‑thread (PT) design includes an extended unthreaded shank that improves shear resistance and ensures proper alignment in high‑load bolted joints, particularly in flanged connections and thick structural assemblies. Its 5‑1/2" length allows secure fastening through substantial material stacks, while the heavy hex head provides increased bearing surface and enhanced wrench engagement for controlled, high‑torque installation. Commonly used in piping systems, pressure assemblies, structural steel connections, and heavy equipment fabrication, this fastener delivers reliable resistance to rust, oxidation, and environmental exposure for long‑term service in indoor, outdoor, and moderately corrosive environments.