S-90128A058 2-56 x 3/4" 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 from zinc plating protects against rust and environmental degradation, extending service life in harsh industrial environments.
• Precision Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening in machinery and equipment.
• High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated installation and removal cycles.
• Standard hex socket drive (5/64") allows for high-torque installation with common Allen wrenches, facilitating quick and secure fastening in confined spaces.
• Coarse UNC threading enables faster assembly and better performance in materials where fine threads might strip or clog.
• Full regulatory compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety for global industrial applications.

Professional Applications & Engineering Value

Engineered for high-stress industrial applications, this zinc-plated alloy steel socket head cap screw delivers exceptional reliability where fastener failure is not an option. The combination of 170,000 PSI tensile strength and Rockwell C37 hardness provides superior resistance to both static and dynamic loading, making it ideal for precision machinery, automotive assemblies, and heavy equipment. The Class 3A thread fit with coarse UNC threading ensures secure engagement in various materials while the standard hex socket drive accommodates high installation torque without stripping. These features collectively address critical engineering challenges including vibration-induced loosening, corrosion in harsh environments, and the need for repeated maintenance access without compromising fastener integrity.

Specification Summary & Compliance

This 2-56 UNC thread socket head cap screw features precision Class 3A thread fit with coarse thread spacing and right-hand thread direction. Manufactured to ASTM A574 specifications for socket head cap screws, it maintains dimensional accuracy throughout its 3/4" length. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability for industrial applications worldwide.