S-91274A183 5/8"-11 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 in high-stress industrial and construction applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the zinc-flake coating protects against harsh environments, extending service life and minimizing maintenance needs.
• Precision Class 3A thread fit provides tight tolerances and secure fastening, ideal for critical assemblies where vibration resistance is essential.
• High hardness rating (Rockwell C37) offers excellent wear resistance and durability under repeated loading conditions.
• Hex drive design allows for easy installation and high torque application with standard tools, improving assembly efficiency.
• Coarse UNC threading enables quick engagement and disassembly, saving time in maintenance and repair operations.
• Full compliance with industry standards including ASME B18.3 and ASTM A574 ensures consistent quality and interoperability in professional settings.

Professional Applications & Engineering Value

This 5/8"-11 UNC Socket Head Cap Screw is engineered to address common challenges in demanding sectors such as heavy machinery, structural frameworks, and automotive assemblies. The zinc-flake-coated alloy steel construction provides a robust barrier against corrosion, which is critical in outdoor or chemically aggressive environments where standard fasteners may degrade quickly. The Class 3A thread fit and coarse UNC thread spacing ensure reliable engagement even in high-vibration applications, reducing loosening over time. With its hex drive style and fully threaded rod design, it supports efficient installation and uniform clamping force, making it a preferred choice for engineers seeking durability and ease of use in industrial socket head screw applications. This fastener’s high tensile strength and compliance with key standards like ASME B18.3 make it ideal for critical connections in construction and manufacturing, where failure is not an option.

Specification Summary & Compliance

This socket head cap screw features a Class 3A thread fit with UNC coarse thread spacing and a right-hand thread direction, ensuring precise dimensional accuracy as per ASME B18.3 and ASTM A574 specifications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for environmentally conscious procurement. Additionally, the product meets ASTM B117 standards for corrosion testing, reinforcing its reliability in regulated industrial applications.