S-91251A963 1 1/2"-6 x 8" 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.
• Black-oxide coating on alloy steel provides enhanced corrosion resistance and a durable, non-reflective finish for extended service life.
• Rockwell C37 hardness offers superior wear resistance, maintaining thread integrity and dimensional stability under heavy loads.
• Partially threaded design with coarse UNRC threads allows for faster installation and secure gripping in a wide range of materials.
• Hex socket drive enables high-torque application with standard tools, minimizing slippage and improving assembly efficiency.
• Class 2A thread fit ensures consistent, easy assembly while maintaining strong holding power in demanding environments.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees 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 machinery, construction, and automotive assemblies where vibration resistance and high clamp load are paramount. The coarse UNRC thread design prevents cross-threading and facilitates quick alignment, reducing installation time in field operations. With a 1 1/2"-6 thread size and 8-inch length, it provides robust fastening for structural components, while the partially threaded rod type concentrates strength where needed most. The alloy steel material combined with black-oxide surface treatment resists rust and wear, ensuring long-term reliability in harsh conditions. Ideal for industrial screws and heavy-duty fasteners, this product delivers consistent performance, minimizing downtime and maintenance costs.

Specification Summary & Compliance

This socket head cap screw features precise Class 2A thread fit per UNRC standards, ensuring dimensional accuracy and interchangeability. It is manufactured in accordance with ASTM A574 specifications for high-strength alloy steel fasteners, guaranteeing consistent mechanical properties. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of hazardous substances and supporting sustainable procurement practices.