S-91251A678 7/16"-14 x 2 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 under high-stress conditions, reducing the risk of fastener failure in critical applications.
• Superior corrosion resistance from the black-oxide finish extends service life in demanding industrial environments, minimizing maintenance and replacement costs.
• Precise Class 3A thread fit provides secure, vibration-resistant connections, enhancing assembly integrity and reducing loosening over time.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated installation and removal cycles.
• Coarse UNC threads enable faster installation and better performance in materials prone to stripping, improving efficiency on the production line.
• Partially threaded design allows for controlled clamping force, ideal for applications where precise grip length is necessary.
• Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety, meeting global regulatory standards for industrial use.

Professional Applications & Engineering Value

Engineered for demanding environments, these black-oxide alloy steel socket head cap screws deliver robust performance where reliability is non-negotiable. The 7/16"-14 UNC coarse thread and Class 3A fit provide superior resistance to vibration loosening, making them ideal for heavy machinery, automotive assemblies, and construction equipment. The alloy steel core, hardened to Rockwell C37, withstands extreme loads without deformation, while the black-oxide surface treatment offers enhanced corrosion protection in humid or chemically exposed settings. By combining high tensile strength (170,000 PSI) with precise threading, these screws solve common issues like joint failure and assembly inefficiency, ensuring long-term operational stability in industrial applications.

Specification Summary & Compliance

This product adheres to Class 3A thread fit for precise dimensional accuracy under the inch system, with UNC coarse threads and a minimum thread length of 1-3/8". Manufactured in compliance with ASTM A574 specifications, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental and safety regulations are upheld for global industrial use.