S-91274A388 7/16"-14 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 under high-stress conditions, reducing the risk of fastener failure in critical applications.
• Superior corrosion resistance from the zinc-flake coating provides long-lasting protection against harsh industrial environments, extending service life.
• Precision Class 3A thread fit guarantees tight tolerances and secure fastening, minimizing backlash and improving assembly accuracy.
• High hardness rating (Rockwell C37) enhances wear resistance, maintaining thread integrity through repeated use and vibration.
• Fully threaded design allows for consistent clamping force along the entire length, ideal for adjustable and deep-set applications.
• Compliance with ASME B18.3 and ASTM A574 standards ensures consistent quality, interchangeability, and reliability in mechanical systems.
• 3/8" hex drive compatibility offers easy installation with standard tools, reducing assembly time and labor costs.

Professional Applications & Engineering Value

This zinc-flake-coated alloy steel socket head cap screw is engineered to address common industrial challenges such as vibration loosening, corrosion-induced degradation, and high-load demands. The coarse UNC thread and Class 3A fit provide excellent engagement in tough materials, reducing the risk of cross-threading and ensuring stable connections in machinery, automotive assemblies, and heavy equipment. The fully threaded rod type allows for versatile positioning and uniform stress distribution, making it suitable for applications requiring precise alignment and robust fastening. Its high tensile strength and hardness make it a reliable choice for critical joints in construction, aerospace, and manufacturing sectors, where failure is not an option.

Specification Summary & Compliance

This socket head cap screw features a 7/16"-14 UNC coarse thread with Class 3A precision fit, ensuring tight dimensional accuracy per ASME B18.3 and material standards per ASTM A574. It meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, confirming it is free of hazardous substances and suitable for global industrial use. The screw is fully threaded with a length of 1-1/4", head diameter of 21/32", and drive size of 3/8", manufactured to withstand rigorous testing including ASTM B117 for corrosion resistance.