S-91251A791 5/8"-11 x 1/2" 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 applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life in demanding industrial environments.
• Precise Class 3A thread fit provides secure, vibration-resistant connections, minimizing loosening in machinery and equipment.
• Coarse UNC threads enable quick and easy installation, saving time during assembly and maintenance operations.
• Full threading along the entire length offers versatile fastening options and consistent clamping force distribution.
• High hardness (Rockwell C37) enhances wear resistance, maintaining thread integrity through repeated use.
• Comprehensive compliance with ASTM A574, RoHS 3, and REACH standards ensures material quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, this socket head cap screw addresses critical challenges in machinery assembly, automotive systems, and construction equipment. The black-oxide alloy steel construction provides excellent resistance to rust and wear, while the 5/8"-11 UNC coarse threads and Class 3A fit deliver superior grip and vibration damping in high-load scenarios. The hex drive design allows for high-torque installation with standard tools, ensuring secure fastening in confined spaces. Ideal for use in structural frames, engine components, and precision instruments, it combines 170,000 psi tensile strength with full threading to prevent joint failure and reduce maintenance downtime, offering long-term reliability in demanding environments.

Specification Summary & Compliance

This socket head cap screw features precise inch measurements with a 5/8"-11 UNC coarse thread and Class 3A thread fit for tight tolerances. It adheres to ASTM A574 specifications for high-strength alloy steel and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material consistency.