S-91274A312 3/8"-16 x 1 1/4" ASME B18.3, ASTM A574, ASTM B117 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the zinc-flake coating extends service life in harsh industrial environments, minimizing maintenance and replacement costs.
• Precise Class 3A thread fit provides excellent engagement and vibration resistance, ensuring secure, long-lasting assemblies.
• High hardness (Rockwell C37) offers excellent wear resistance and durability, maintaining integrity under repeated use.
• Hex socket drive design allows for high torque application and easy installation in confined spaces, improving assembly efficiency.
• Coarse UNC threads enable quick and easy installation, reducing assembly time and labor costs.
• Full threading along the entire length ensures consistent clamping force and versatility in various material thicknesses.

Professional Applications & Engineering Value

This zinc-flake-coated alloy steel socket head cap screw is engineered to address critical challenges in demanding industrial settings. The combination of 170,000 psi tensile strength and Rockwell C37 hardness makes it ideal for heavy machinery, automotive assemblies, and structural applications where vibration resistance and load-bearing capacity are paramount. The zinc-flake coating provides superior corrosion protection, significantly outperforming standard platings in aggressive environments, while the 3/8"-16 UNC coarse thread and Class 3A fit ensure rapid, secure installation without cross-threading risks. These screws deliver reliable performance in high-stress applications, reducing downtime and maintenance costs through enhanced durability and compliance with rigorous industry standards.

Specification Summary & Compliance

This socket head cap screw features precise 3/8"-16 UNC threads with Class 3A fit for superior engagement and vibration resistance. It is manufactured in accordance with ASME B18.3 and ASTM A574 specifications, ensuring dimensional accuracy and mechanical properties. The zinc-flake coating meets ASTM B117 salt spray testing requirements for corrosion resistance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and regulatory adherence for global industrial use.