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

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