S-91251A806 5/8"-11 x 3" 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 with black-oxide coating on alloy steel extends service life in harsh industrial environments.
• Precise Class 3A thread fit provides tight tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
• Heavy-duty 1/2" hex drive allows for high torque application, enabling efficient installation and removal with standard tools.
• Partially threaded design offers optimal grip and clamping force where needed, enhancing joint stability in machinery and equipment.
• High hardness rating (Rockwell C37) resists wear and deformation, maintaining integrity under repeated loads.
• Compliance with ASTM A574 and environmental standards ensures consistent quality and safe use in regulated industries.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery assembly, automotive systems, and construction equipment. The UNRC coarse thread and Class 3A fit provide excellent engagement and resistance to vibration, reducing maintenance needs in dynamic environments. With a tensile strength of 170,000 psi and robust Rockwell C37 hardness, it withstands extreme forces and wear, ensuring long-term reliability. The partially threaded rod type allows for precise clamping in applications where full threading isn't required, optimizing load distribution. Ideal for industrial fasteners in high-stress scenarios, this screw delivers consistent performance while meeting strict ASTM A574 specifications for quality assurance.

Specification Summary & Compliance

This socket head cap screw features a 5/8"-11 UNRC coarse thread with Class 3A thread fit for high precision, a length of 3", and a minimum thread length of 1 3/4". It complies with ASTM A574 manufacturing standards and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring environmental safety and regulatory adherence for industrial use.