S-91251A679 7/16"-14 x 2 1/2" 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 the black-oxide finish extends service life and maintains integrity in harsh or humid industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
• Partially threaded design allows for controlled clamping force and easier alignment in components where full threading isn't required.
• High hardness (Rockwell C37) enhances wear resistance and durability, making it suitable for repetitive or high-load applications.
• Coarse UNC threads enable quicker installation and reduced cross-threading risks, improving assembly efficiency.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency, environmental safety, and adherence to international standards.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial use, these socket head cap screws excel in applications requiring high clamping force and reliability, such as machinery frames, automotive assemblies, and construction equipment. The black-oxide alloy steel construction combats rust and oxidation, addressing common failure points in corrosive settings. With a coarse UNC thread and Class 3A fit, these fasteners provide secure engagement in materials like steel or cast iron, reducing the need for frequent retightening. The partially threaded rod design concentrates stress on the engaged section, minimizing thread damage and simplifying disassembly for maintenance. Ideal for high-strength bolting in confined spaces, the hex drive allows for efficient torque application with standard tools, streamlining installation in time-sensitive projects.

Specification Summary & Compliance

This socket head cap screw features a 7/16"-14 UNC coarse thread with Class 3A thread fit for precise dimensional accuracy, ensuring consistent performance in inch-based assemblies. Manufacturing adheres to ASTM A574 specifications, guaranteeing material and mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free of restricted hazardous substances and safe for industrial use.