S-91251A013 3/8"-16 x 9" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Rockwell C37 hardness provides superior wear resistance and durability, extending service life in demanding environments.
• Black-oxide coating on alloy steel offers corrosion resistance and a clean, professional appearance for industrial assemblies.
• Class 3A thread fit with UNRC coarse threads ensures precise, secure mating with nuts and tapped holes, minimizing assembly issues.
• Partially threaded design allows for controlled clamping force and easier alignment in structural and machinery applications.
• 5/16" hex drive and standard socket head profile enable high-torque installation with common tools, improving efficiency.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global supply chains.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery manufacturing, automotive systems, and construction equipment. The combination of alloy steel material and black-oxide surface treatment resists corrosion and abrasion, reducing maintenance needs in harsh conditions. With a coarse UNRC thread and Class 3A fit, it provides reliable engagement and vibration resistance, preventing loosening in dynamic applications. The partially threaded rod type ensures optimal stress distribution, making it ideal for precision assemblies where controlled clamping is essential. These features deliver long-term reliability, supporting efficient production and minimizing downtime in industrial socket screw applications.

Specification Summary & Compliance

This screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and UNRC coarse thread spacing for robust performance. It meets ASTM A574 specifications for high-strength alloy steel socket head cap screws, ensuring consistent quality and mechanical properties. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety and environmental responsibility for use in various industrial sectors.