1‑1/4"-8 x 3‑1/2" Stainless Steel 304 B8 Heavy Hex Head Cap Screw, Full Thread, ASTM A193 Class 1

This 1‑1/4"-8 x 3‑1/2" full‑thread 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 industrial and structural applications where corrosion resistance is essential. The full‑thread (FT) construction allows complete thread engagement along the entire length, providing uniform clamping force and adaptability in assemblies with varying grip lengths. The heavy hex head delivers increased bearing area and enhanced wrenching leverage compared to standard hex heads, supporting precise torque control during installation. Commonly used in piping systems, flanged joints, pressure assemblies, and heavy equipment fabrication, this stainless fastener resists rust, oxidation, and environmental exposure, ensuring consistent long‑term performance in indoor, outdoor, and moderately corrosive service conditions.