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

This 1"-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, making it well suited for heavy‑duty industrial and structural fastening where corrosion resistance and strength are critical. The partial‑thread (PT) design includes a long, unthreaded shank that improves shear strength and ensures proper load distribution in high‑stress bolted joints, particularly in flanged connections and thick structural assemblies. Its 4‑1/2" length supports deep engagement through substantial material stacks, while the heavy hex head provides increased bearing surface and superior wrenching leverage for controlled torque application. Commonly specified for piping systems, pressure assemblies, equipment supports, and industrial fabrication, this stainless fastener delivers dependable resistance to rust, oxidation, and environmental exposure for long‑term performance in indoor, outdoor, and moderately corrosive environments.