S-91251A139 3/4"-10 x 7 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 extreme loads, reducing the risk of fastener failure in demanding applications.
• Superior corrosion resistance from the black-oxide finish on alloy steel, extending service life and maintaining integrity in harsh industrial environments.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies, minimizing loosening over time.
• High torque capability with the 5/8" hex drive and standard socket head profile, allowing for easy installation and removal with standard tools.
• Enhanced durability from Rockwell C37 hardness, resisting wear and deformation for long-term use in heavy machinery and equipment.
• Optimized for coarse UNRC threads (3/4"-10), enabling quick assembly and strong holding power in various materials.
• Compliance with ASTM A574, RoHS 3, and REACH ensures environmental safety and meets global industrial standards for quality and reliability.

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 high-stress mechanical assemblies and equipment requiring robust fastening solutions. The alloy steel construction combined with a black-oxide surface treatment provides excellent resistance to corrosion and abrasion, making it ideal for applications in manufacturing, automotive, and construction industries where exposure to moisture and chemicals is common. The coarse UNRC thread and Class 3A fit ensure quick, secure installations with minimal risk of cross-threading, while the partially threaded design allows for precise clamping in structural components. With a high tensile strength of 170,000 psi, it effectively handles dynamic loads and vibrations, reducing maintenance needs and enhancing operational safety in machinery and infrastructure projects.

Specification Summary & Compliance

This socket head cap screw features a 3/4"-10 coarse UNRC thread with Class 3A thread fit for high precision, a 5/8" hex drive for efficient torque application, and dimensions including a 7 1/2" length with a minimum thread length of 2". It complies with ASTM A574 specifications for high-strength fasteners, and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards for environmental and safety regulations, ensuring reliability in global industrial applications.