S-90128A166 7/8"-9 x 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 zinc plating protects against rust and environmental degradation, extending service life in harsh industrial conditions.
• Precise Class 3A thread fit provides tighter tolerances for secure fastening and vibration resistance, minimizing loosening in critical assemblies.
• High hardness rating (Rockwell C37) offers excellent wear resistance and durability, maintaining thread integrity through repeated use.
• Fully threaded design allows for maximum grip and adjustability across the entire 2" length, providing versatile installation options.
• Heavy-duty 3/4" hex drive enables high-torque installation with standard tools, ensuring efficient assembly and disassembly.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees material quality and environmental safety for global industrial applications.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these zinc-plated alloy steel socket head cap screws deliver exceptional performance where reliability is non-negotiable. The 7/8"-9 UNC coarse thread with Class 3A fit ensures secure fastening in high-vibration environments like machinery, automotive assemblies, and structural frameworks. The combination of 170,000 psi tensile strength and Rockwell C37 hardness addresses common failure points in dynamic loading scenarios, while the fully threaded design provides uniform stress distribution. The zinc plating offers critical corrosion protection in manufacturing facilities, outdoor equipment, and chemical processing plants, making these socket head cap screws ideal for engineers requiring both mechanical excellence and long-term durability.

Specification Summary & Compliance

This socket head cap screw features precision 7/8"-9 UNC coarse threads with Class 3A thread fit for superior dimensional accuracy. Manufactured to ASTM A574 specifications for high-strength alloy steel fasteners, it ensures consistent performance in critical applications. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, meeting international environmental and safety standards for industrial components.