S-91251A136 5/8"-11 x 11" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under extreme loads, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance from the black-oxide finish on alloy steel extends service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant connections, enhancing assembly integrity.
• High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use and high-stress conditions.
• Partially threaded design with a minimum thread length of 1 3/4" allows for optimal grip and clamping force in varied material thicknesses.
• Coarse UNRC threads enable faster installation and reduced cross-threading risks, improving efficiency in assembly lines.
• Compliance with ASTM A574, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations, supporting sustainable procurement.

Professional Applications & Engineering Value

This 5/8"-11 socket head cap screw is engineered for heavy-duty industrial applications where reliability and durability are critical. The black-oxide alloy steel construction provides enhanced corrosion resistance, making it ideal for machinery, automotive, and construction sectors exposed to moisture and chemicals. Its coarse UNRC threads and Class 3A thread fit deliver superior clamping force and vibration resistance, addressing common issues like loosening under dynamic loads. With a 1/2" hex drive and standard socket head profile, it allows for easy installation in confined spaces, reducing assembly time. The high tensile strength and Rockwell C37 hardness ensure long-term performance in high-stress environments, offering engineers a dependable solution for critical fastening needs.

Specification Summary & Compliance

This socket head cap screw features a 5/8"-11 UNRC coarse thread with Class 3A thread fit for precise dimensional accuracy, ensuring consistent performance. It meets ASTM A574 specifications for high-strength alloy steel fasteners and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental and safety standards in industrial use.