S-90128A586 5/16"-18 x 1 1/4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Zinc-plated alloy steel construction provides excellent corrosion resistance, extending service life in harsh environments.
• Class 3A thread fit offers superior precision and tighter tolerances for secure, vibration-resistant assemblies.
• Fully threaded design allows for maximum grip and uniform load distribution along the entire length.
• Hex socket drive enables easy installation with standard tools, even in confined spaces, improving assembly efficiency.
• Coarse UNC threads facilitate quick engagement and disassembly, saving time in maintenance and repairs.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global industrial use.

Professional Applications & Engineering Value

This 5/16"-18 UNC socket head cap screw is engineered to address common industrial challenges such as vibration loosening and material fatigue. Made from zinc-plated alloy steel, it combines high Rockwell C37 hardness with robust 170,000 psi tensile strength, making it ideal for heavy-duty machinery, automotive assemblies, and precision equipment where reliability is critical. The fully threaded and Class 3A thread fit design ensures secure fastening in dynamic environments, minimizing downtime and maintenance costs. Its coarse thread spacing and hex drive allow for efficient installation in tight spaces, enhancing productivity in manufacturing and repair operations.

Specification Summary & Compliance

This socket head cap screw features a 5/16"-18 UNC thread with Class 3A fit for precise dimensional accuracy, and is manufactured in accordance with ASTM A574 specifications. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental and safety adherence for industrial use.