S-90128A169 7/8"-9 x 4" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 PSI for reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance with zinc-plated alloy steel construction, extending service life in harsh environments and minimizing maintenance needs.
• Precise Class 3A thread fit ensures tight, secure fastening with minimal play, enhancing assembly accuracy and vibration resistance.
• High hardness (Rockwell C37) provides excellent wear resistance and durability, maintaining integrity under repeated loads.
• Partially threaded design allows for optimal grip and clamping force control, ideal for applications requiring specific unthreaded shank sections.
• 3/4" hex drive compatibility enables easy installation with standard tools, speeding up assembly and reducing labor time.
• Compliance with ASTM A574, RoHS 3, and REACH guarantees adherence to rigorous quality and environmental standards, ensuring safety and regulatory acceptance.

Professional Applications & Engineering Value

This 7/8"-9 UNC Socket Head Cap Screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery assembly, construction equipment, and automotive systems. Made from zinc-plated alloy steel, it combats corrosion and wear, prolonging lifespan in demanding conditions. The coarse thread and Class 3A fit provide superior holding power, reducing loosening from vibrations—a common pain point in dynamic environments. With a partially threaded rod, it offers precise clamping in applications like structural frames or motor mounts, where unthreaded sections prevent over-tightening and distribute stress evenly. Ideal for high-strength fastening needs, this screw ensures reliability in operations requiring maximum torque and durability, backed by its robust ASTM A574 compliance.

Specification Summary & Compliance

This socket head cap screw features a 7/8"-9 UNC coarse thread with a Class 3A thread fit for high precision and minimal tolerance. It adheres to ASTM A574 manufacturing standards, ensuring consistent quality and performance. Additionally, it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its safety for use in various industrial applications without hazardous substances.