S-91251A688 7/16"-14 x 5 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 provided by the black-oxide finish, extending service life in harsh industrial environments and minimizing maintenance needs.
• Precise torque transmission with the 3/8" hex drive, allowing for secure installation and reducing the likelihood of stripping during assembly.
• Optimized thread engagement through Class 3A thread fit and coarse UNC threading, enabling faster assembly and improved vibration resistance.
• Enhanced durability from Rockwell C37 hardness, maintaining structural integrity and reducing wear over repeated use cycles.
• Versatile partial threading with a minimum 1-3/8" thread length, providing flexibility for applications requiring both clamped and unthreaded sections.
• Broad compliance with ASTM A574, RoHS 3, and REACH standards, ensuring 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 critical challenges in heavy-duty machinery, automotive assemblies, and structural frameworks. The high-strength alloy steel core, combined with a Class 3A UNC coarse thread, delivers superior clamp load retention and vibration resistance, preventing loosening in dynamic environments. The partially threaded design allows for precise positioning in bolted joints, while the 3/8" hex drive facilitates efficient installation with standard tools, reducing assembly time. Ideal for applications requiring robust industrial fasteners, it ensures long-term reliability in sectors like manufacturing, construction, and equipment maintenance, where durability and compliance with ASTM A574 are paramount.

Specification Summary & Compliance

This socket head cap screw adheres to precise dimensional standards, including Class 3A thread fit for tight tolerances and UNC coarse threading (7/16"-14) for efficient engagement. Manufactured in compliance with ASTM A574 for consistent quality, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material traceability. The specifications cover a length of 5-1/2", head diameter of 21/32", and minimum thread length of 1-3/8", supporting reliable performance in regulated industrial settings.