S-91251A619 3/8"-16 x 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior tensile strength of 170,000 psi ensures reliable performance under extreme loads, reducing the risk of fastener failure in critical applications.
• Exceptional hardness (Rockwell C37) provides excellent resistance to wear and deformation, extending service life in high-stress environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance, protecting the fastener in demanding industrial conditions.
• Precision Class 3A thread fit guarantees tight, secure connections with minimal backlash, ideal for applications requiring high accuracy.
• 5/16" hex drive socket head allows for easy installation and high torque application, improving assembly efficiency and reducing tool slippage.
• Fully threaded UNC coarse thread design ensures rapid installation and strong holding power, suitable for a wide range of materials and assemblies.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety, meeting strict industry and regulatory standards.

Professional Applications & Engineering Value

This Black-Oxide Alloy Steel Socket Head Cap Screw is engineered to address common industrial challenges such as vibration loosening, corrosion, and high-stress fatigue. The alloy steel construction combined with the black-oxide surface treatment provides durability and resistance to harsh environments, making it ideal for machinery, automotive, and aerospace applications. The UNC coarse thread and Class 3A thread fit ensure quick, secure fastening in metals and composites, reducing assembly time while maintaining precision. Its fully threaded design offers consistent clamping force, preventing joint failure in dynamic loads. These features make it a reliable choice for engineers seeking high-performance socket head screws that deliver long-term reliability and compliance with industry standards.

Specification Summary & Compliance

This socket head cap screw features a 3/8"-16 UNC coarse thread with a Class 3A thread fit for precise dimensional accuracy. It is manufactured in accordance with ASTM A574 specifications, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards for industrial use.