S-91251A372 1/2"-13 x 1 1/8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
• Black-oxide coating on alloy steel provides corrosion resistance and a durable finish, extending service life in demanding environments.
• Class 3A thread fit offers precise, tight-tolerance engagement for secure fastening and vibration resistance.
• Coarse UNRC threads enable quick installation and superior grip in a variety of materials, enhancing assembly efficiency.
• Fully threaded design allows for maximum adjustability and holding power along the entire length of the screw.
• 3/8" hex drive socket head facilitates easy access and high-torque application with standard tools, minimizing stripping.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency, environmental safety, and suitability for regulated industries.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical industrial challenges, such as vibration loosening and corrosion in heavy machinery, automotive assemblies, and construction equipment. The alloy steel construction, combined with a Rockwell C37 hardness, provides excellent durability and fatigue resistance, making it ideal for applications requiring repeated disassembly. Its coarse UNRC threads and Class 3A fit ensure reliable performance in high-load scenarios, reducing maintenance downtime. The black-oxide surface treatment enhances corrosion protection without compromising dimensional accuracy, supporting long-term reliability in harsh environments. This screw delivers consistent fastening solutions for OEMs and maintenance teams seeking robust, compliant components.

Specification Summary & Compliance

This product features a 1/2"-13 thread size with Class 3A thread fit and coarse UNRC threading for precise dimensional accuracy. It is manufactured in accordance with ASTM A574 specifications, ensuring high strength and material integrity. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards confirms its adherence to environmental and safety regulations, making it suitable for global industrial use.