S-91274A424 7/16"-14 x 4" ASME B18.3, ASTM A574, ASTM B117 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.
• Superior corrosion resistance from the zinc-flake coating protects against harsh industrial environments, extending service life.
• Precise Class 3A thread fit provides tighter tolerances for secure, vibration-resistant assemblies in critical machinery.
• High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining integrity under repeated use.
• 3/8" hex drive design allows for easy installation and high torque application with standard tools, improving assembly efficiency.
• Partially threaded shank enables precise clamping force control, ideal for applications requiring specific grip lengths.
• Compliance with major standards including ASME B18.3 and ASTM A574 guarantees consistent quality and interoperability.

Professional Applications & Engineering Value

This 7/16"-14 UNC Socket Head Cap Screw is engineered to address common industrial challenges such as vibration loosening and environmental degradation. The zinc-flake-coated alloy steel construction provides a robust barrier against corrosion, making it suitable for outdoor equipment, automotive assemblies, and heavy machinery exposed to moisture or chemicals. The coarse UNC thread and Class 3A fit ensure quick installation and secure fastening in materials like cast iron or steel, reducing assembly time while maintaining joint integrity. Its high tensile strength and Rockwell C37 hardness make it ideal for high-load applications, from construction frameworks to manufacturing jigs, where reliability is critical. The partially threaded design allows for unthreaded shank sections to act as dowels, providing shear resistance in dynamic loads.

Specification Summary & Compliance

This screw features a 4" length with a minimum thread length of 1-3/8", UNC coarse threads, and Class 3A thread fit for precise dimensional accuracy. It meets ASME B18.3 for socket head cap screws, ASTM A574 for alloy steel material properties, and ASTM B117 for salt spray corrosion testing. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial markets.