S-90117A539 1/4"-20 x 5/8" ASME B18.3 Alloy Steel Wire-Lockable Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI provides reliable performance in high-stress applications, reducing the risk of fastener failure.
• Black-oxide coating on alloy steel offers superior corrosion resistance and a durable finish, extending service life in harsh industrial environments.
• Class 3A thread fit ensures precise, tight tolerances for secure fastening and vibration resistance in critical assemblies.
• Hex socket drive design allows for high torque application and easy installation in confined spaces, improving assembly efficiency.
• Fully threaded UNC coarse pattern enables quick engagement and strong holding power, speeding up production and maintenance tasks.
• Compliance with ASME B18.3 and environmental standards guarantees consistent quality and safe use across regulated industries.
• Rockwell C37 hardness maintains structural integrity under heavy loads, ensuring long-term durability and reduced replacement costs.

Professional Applications & Engineering Value

This Socket Head Cap Screw is engineered to address common industrial challenges, such as vibration loosening and corrosion in demanding settings. Made from black-oxide alloy steel, it resists rust and wear, making it ideal for machinery, automotive, and heavy equipment applications. The UNC coarse thread and Class 3A fit provide a secure, precise connection that minimizes backlash and maintains alignment under dynamic loads. Its hex drive and fully threaded design allow for efficient installation in tight spaces, reducing assembly time and enhancing productivity. By combining high tensile strength with robust materials, this screw delivers reliable performance in critical industrial fastening scenarios, ensuring operational safety and longevity.

Specification Summary & Compliance

This product features a 1/4"-20 UNC thread with Class 3A fit for high precision and coarse spacing. It adheres to ASME B18.3 manufacturing standards and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and quality consistency in industrial use.