S-91251A076 2-56 x 3/16" 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 in demanding applications.
• Superior corrosion resistance with black-oxide coating on alloy steel, extending service life and maintaining integrity in harsh industrial environments.
• Precise Class 3A thread fit guarantees tight, secure fastening with minimal play, ideal for applications requiring high vibration resistance and accuracy.
• Coarse UNC thread spacing allows for quick and easy installation, saving time and labor costs in assembly and maintenance tasks.
• Fully threaded design provides consistent grip along the entire length, enhancing load distribution and stability in various materials.
• 5/64" hex drive compatibility offers efficient torque application with standard tools, minimizing slippage and improving installation safety.
• Compliance with ASTM A574, RoHS 3, and REACH ensures adherence to rigorous quality and environmental standards, supporting sustainable and safe industrial use.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in industrial settings, such as vibration-induced loosening and corrosion in machinery. With its 2-56 UNC thread and Class 3A fit, it delivers precise alignment and robust clamping force, making it ideal for high-precision equipment, automotive assemblies, and heavy-duty manufacturing. The coarse thread spacing facilitates rapid installation in tough materials, while the fully threaded rod type ensures uniform stress distribution, preventing joint failure. By combining 170,000 PSI tensile strength and Rockwell C37 hardness, this screw withstands extreme loads and wear, reducing maintenance downtime and enhancing operational reliability in sectors like aerospace, electronics, and construction.

Specification Summary & Compliance

This socket head cap screw features precise inch system measurements, including a thread size of 2-56 with UNC coarse spacing and Class 3A thread fit for tight tolerances. It adheres to ASTM A574 specifications for high-strength alloy steel fasteners and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.