1‑1/4"-8 x 6‑1/2" Stainless Steel 304 B8 Heavy Hex Head Cap Screw, Partial Thread, ASTM A193 Class 1

This 1‑1/4"-8 x 6‑1/2" heavy hex head cap screw is manufactured from Type 304 stainless steel and produced to ASTM A193 Grade B8, Class 1, providing reliable corrosion resistance and mechanical strength for large‑diameter, extended‑length industrial fastening applications. The partial‑thread (PT) design incorporates a long unthreaded shank that improves shear strength, supports proper joint alignment, and enhances load transfer in high‑stress bolted connections, especially in flanged joints and thick structural assemblies. Its 6‑1/2" length allows secure fastening through substantial material stacks, while the heavy hex head offers increased bearing surface and excellent wrench engagement for controlled, high‑torque installation. Commonly used in piping systems, pressure equipment, structural steel fabrication, and heavy machinery installations, this fastener delivers dependable resistance to rust, oxidation, and environmental exposure for long‑term performance in indoor, outdoor, and moderately corrosive environments.