S-91309A798 5/8"-11 x 1 1/2" ASME B18.2.1, ASTM A307 Low-Strength Steel Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 60,000 PSI ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
• Superior corrosion resistance from zinc plating extends service life in harsh industrial environments, minimizing maintenance needs.
• Full threading provides consistent grip along the entire length, enhancing load distribution and joint integrity.
• Coarse UNC thread design allows for quick installation and removal, saving time in assembly and disassembly processes.
• Class 2A thread fit ensures easy assembly with standard nuts while maintaining secure fastening, improving workflow efficiency.
• External hex drive and hex head offer straightforward tool engagement, enabling high torque application without slippage.
• Rockwell B69 hardness provides excellent durability and resistance to wear, ensuring long-term reliability in demanding applications.

Professional Applications & Engineering Value

This 5/8"-11 UNC hex head screw is engineered to address critical fastening challenges in industrial applications, such as heavy machinery, structural assemblies, and construction projects. Constructed from Grade A307 steel, it delivers robust strength and stability, preventing loosening under vibration and dynamic loads. The zinc plating offers a protective barrier against moisture and chemicals, significantly reducing corrosion-related failures. With its coarse thread and external hex drive, it enables rapid installation in tough materials, streamlining maintenance and reducing downtime. Ideal for use where high tensile strength and corrosion resistance are paramount, this screw ensures secure, long-lasting connections in demanding environments.

Specification Summary & Compliance

This product adheres to Class 2A thread fit and UNC coarse thread standards, ensuring precise dimensional accuracy and compatibility. It meets ASME B18.2.1 and ASTM A307 specifications for consistent manufacturing quality. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming environmental safety and regulatory adherence for global industrial use.