S-91274A187 5/8"-11 x 2" 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 extreme loads and prevents fastener failure in demanding applications.
• Superior corrosion resistance from the zinc-flake coating provides long-lasting protection against harsh industrial environments, extending service life.
• Precise Class 3A thread fit guarantees secure, vibration-resistant assemblies with minimal risk of loosening in critical machinery.
• High Rockwell C37 hardness offers excellent wear resistance, maintaining thread integrity and drive features through repeated use.
• Heavy-duty 1/2" hex drive allows for high torque application, ensuring a tight and secure fit with standard tools.
• Compliance with ASME B18.3 and ASTM A574 assures consistent quality, dimensional accuracy, and material reliability for engineering specifications.
• RoHS 3 and REACH compliance makes this screw suitable for use in regulated industries and global markets without environmental concerns.

Professional Applications & Engineering Value

This 5/8"-11 UNC Socket Head Cap Screw is engineered for high-stress applications where failure is not an option. The zinc-flake-coated alloy steel construction combats corrosion in outdoor or chemically aggressive settings, while the coarse UNC thread and Class 3A fit provide superior holding power in soft materials or where vibration is a concern. Its partially threaded design concentrates clamping force precisely where needed, making it ideal for heavy machinery, automotive assemblies, and structural frameworks. The combination of 170,000 psi tensile strength and Rockwell C37 hardness ensures that the screw maintains its integrity under dynamic loads, solving common issues of stripping and fatigue in industrial fastening.

Specification Summary & Compliance

This socket head cap screw features a 5/8"-11 UNC coarse thread with a Class 3A thread fit for precision assembly. It is manufactured in accordance with ASME B18.3 and ASTM A574 specifications, ensuring dimensional accuracy and material consistency. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for use in environmentally conscious and regulated industrial markets.