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

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