S-91251A796 5/8"-11 x 1 1/4" 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 corrosion resistance from the black-oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 3A thread fit provides secure, vibration-resistant connections, enhancing assembly integrity and safety.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
• Coarse UNRC threads allow for quicker installation and easier alignment, saving time in production and maintenance.
• Fully threaded design ensures consistent clamping force along the entire length, ideal for adjustable or deep-set applications.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety, meeting global industry standards.

Professional Applications & Engineering Value

Engineered for demanding industrial settings, these black-oxide alloy steel socket head cap screws deliver robust performance where corrosion and high loads are concerns. The Class 3A coarse UNRC threads provide superior grip in materials like steel or cast iron, resisting loosening under vibration—common in machinery, automotive, and construction assemblies. With a 170,000 psi tensile strength and Rockwell C37 hardness, they withstand extreme forces without stripping or deforming, reducing downtime. The black-oxide surface treatment adds a protective layer against moisture and chemicals, making them ideal for outdoor or corrosive environments. Paired with a 1/2" hex drive for easy torque application, these fasteners streamline maintenance and ensure long-term reliability in heavy-duty applications.

Specification Summary & Compliance

This socket head cap screw features a 5/8"-11 coarse UNRC thread with Class 3A fit for precise tolerance, ensuring consistent engagement. It is manufactured to ASTM A574 specifications for high-strength alloy steel and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, affirming its safety and environmental standards.