1‑1/4"-7 x 5‑1/2" Stainless Steel 304 B8 Heavy Hex Head Cap Screw, Partial Thread, ASTM A193 Class 1

This 1‑1/4"-7 x 5‑1/2" heavy hex head cap screw is manufactured from 304 stainless steel and produced to ASTM A193 Grade B8, Class 1, making it suitable for large‑diameter, extended‑length industrial fastening applications where corrosion resistance and load reliability are essential. The partial‑thread (PT) design provides a long unthreaded shank that enhances shear strength, improves joint alignment, and supports effective load transfer in high‑stress bolted connections such as flanges and thick structural assemblies. Its 5‑1/2" length allows secure fastening through deep material stacks, while the heavy hex head offers increased bearing surface and superior wrench engagement for controlled, high‑torque installation. Commonly used in piping systems, pressure assemblies, structural steel fabrication, and heavy equipment installations, this fastener delivers dependable resistance to rust, oxidation, and environmental exposure for long‑term performance in indoor, outdoor, and moderately corrosive environments.