S-91251A914 1"-8 x 2 1/2" 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.
• Superior hardness rating of Rockwell C37 provides excellent wear resistance and durability, extending the service life of the screw.
• Corrosion-resistant black-oxide coating protects against rust and environmental damage, ideal for use in harsh industrial conditions.
• Precise Class 3A thread fit offers tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
• Fully threaded design allows for consistent clamping force along the entire length, enhancing joint integrity in various applications.
• 3/4" hex drive enables easy installation and removal with standard tools, improving assembly efficiency and reducing labor time.
• Compliance with ASTM A574, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations, providing peace of mind for regulated industries.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in demanding industrial environments, such as machinery, automotive, and heavy equipment assembly. Its high tensile strength and Rockwell C37 hardness prevent stripping and deformation under extreme loads, while the corrosion-resistant coating ensures longevity in moist or chemically aggressive settings. The coarse UNRC thread and Class 3A fit provide superior grip and vibration resistance, reducing maintenance needs in dynamic applications. Ideal for securing components in high-stress joints, this screw delivers reliable performance, minimizing downtime and enhancing operational safety in industrial fastening systems.

Specification Summary & Compliance

This socket head cap screw features a 1"-8 coarse thread with a Class 3A fit for precise dimensional accuracy, adhering to UNRC thread standards. It is manufactured in compliance with ASTM A574 specifications, ensuring consistent quality and performance. Additionally, the product meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulatory requirements, confirming its suitability for use in environmentally conscious and regulated industries.