S-91251A470 2-56 x 3/32" 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.
• Superior corrosion resistance from the black-oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 3A thread fit guarantees tight, secure connections with minimal backlash, enhancing assembly accuracy.
• High hardness rating (Rockwell C37) provides excellent wear resistance, maintaining thread integrity through repeated use.
• Compact 5/64" hex drive allows for easy installation in confined spaces with standard tools, speeding up assembly processes.
• Coarse UNC threading enables quick engagement and disassembly, improving efficiency in maintenance and repairs.
• Full compliance with ASTM A574, RoHS 3, and REACH ensures material consistency 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 precision assemblies, such as vibration-induced loosening and corrosion in demanding environments. The 2-56 UNC coarse threads with a Class 3A fit deliver superior clamping force and resistance to stripping, ideal for compact machinery, electronics enclosures, and automotive components. Its high tensile strength and Rockwell C37 hardness ensure durability in applications subjected to dynamic loads, while the black-oxide surface treatment provides a protective layer against moisture and chemicals. By integrating these features, it reduces downtime and enhances the reliability of industrial fastening systems, making it a trusted choice for engineers prioritizing performance and compliance.

Specification Summary & Compliance

This socket head cap screw adheres to precise dimensional standards, including Class 3A thread fit for tight tolerances and UNC coarse thread spacing per inch specifications. It is manufactured in compliance with ASTM A574 for material consistency and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use in various industries. The product maintains full traceability for quality assurance in engineering applications.