S-91251A798 5/8"-11 x 1 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Superior tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Exceptional hardness rating of Rockwell C37 provides excellent resistance to wear and deformation, extending service life.
• Black-oxide finish on alloy steel offers enhanced corrosion resistance for durability in various industrial environments.
• Precise Class 3A thread fit with coarse UNRC threads ensures secure, vibration-resistant connections and easy installation.
• Fully threaded design allows for consistent clamping force along the entire length, ideal for adjustable assemblies.
• 1/2" hex drive and standard socket head facilitate quick, high-torque installation with standard tools, improving efficiency.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global industrial use.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address common industrial challenges such as joint loosening under vibration and corrosion in harsh conditions. Its coarse 5/8"-11 UNRC threads and Class 3A fit provide superior grip and resistance to dynamic loads, making it ideal for heavy machinery, automotive assemblies, and construction equipment. The fully threaded rod type ensures uniform stress distribution, while the hex drive design allows for high-torque applications without stripping. By combining high tensile strength and Rockwell C37 hardness, it minimizes maintenance needs and enhances safety in critical engineering projects, supporting long-term operational reliability.

Specification Summary & Compliance

This socket head cap screw features precise dimensions including a 5/8"-11 coarse thread with Class 3A thread fit for tight tolerances, a length of 1-1/2", and a head diameter of 15/16". It is manufactured in accordance with ASTM A574 specifications, ensuring consistent quality and performance. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its adherence to environmental and safety standards for industrial use worldwide.