S-91251A792 5/8"-11 x 5/8" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance under extreme loads, reducing the risk of fastener failure in critical applications.
• Superior corrosion resistance from the black-oxide coating extends service life in harsh industrial environments, minimizing maintenance and replacement costs.
• Precise Class 3A thread fit guarantees secure, vibration-resistant assemblies with reduced risk of loosening in high-stress machinery.
• High hardness (Rockwell C37) provides excellent wear resistance, maintaining thread integrity through repeated installations and heavy use.
• 1/2" hex drive compatibility allows for high-torque installation with standard tools, speeding up assembly while preventing stripping.
• Coarse UNC thread design enables quick installation and superior holding power in a wide range of materials, from steel to castings.
• Full compliance with ASTM A574 ensures consistent quality and mechanical properties for engineering-critical applications.

Professional Applications & Engineering Value

Engineered for demanding industrial environments, this black-oxide alloy steel socket head cap screw delivers exceptional reliability where standard fasteners fail. The combination of 170,000 psi tensile strength and Rockwell C37 hardness provides critical resistance to both static and dynamic loading in heavy machinery, automotive assemblies, and construction equipment. The Class 3A thread fit maintains precise tolerances even under vibration, preventing costly downtime from loose connections. The black-oxide surface treatment offers superior corrosion protection without compromising dimensional accuracy, making these socket head cap screws ideal for outdoor equipment, manufacturing fixtures, and high-stress structural applications where both strength and environmental resistance are paramount.

Specification Summary & Compliance

This 5/8"-11 UNC socket head cap screw features precision Class 3A threads with coarse spacing for optimal engagement. Manufactured to ASTM A574 specifications for consistent mechanical properties and dimensional accuracy. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory acceptance for industrial use worldwide.