1‑1/4"-7 x 4‑1/2" Stainless Steel 304 B8 Heavy Hex Head Cap Screw, Partial Thread, ASTM A193 Class 1

This 1‑1/4"-7 x 4‑1/2" heavy hex head cap screw is manufactured from Type 304 stainless steel and meets ASTM A193 Grade B8, Class 1 requirements, making it a dependable fastener for large‑diameter, heavy‑duty industrial and structural applications. The partial‑thread (PT) design incorporates an extended unthreaded shank that enhances shear strength, improves joint alignment, and supports proper load transfer in high‑stress bolted connections such as flanges and thick structural assemblies. Its 4‑1/2" length allows secure fastening through substantial material sections, while the heavy hex head provides increased bearing surface and strong wrench engagement for controlled, high‑torque installation. Commonly used in piping systems, pressure connections, equipment supports, and industrial fabrication, this stainless fastener offers reliable resistance to rust, oxidation, and environmental exposure for long‑term performance in indoor, outdoor, and moderately corrosive environments.