S-91274A512 1/2"-13 x 6 1/2" 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 and minimizing maintenance.
• Precise Class 3A thread fit provides tight, secure connections with minimal play, enhancing assembly accuracy and vibration resistance.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity and drive features through repeated use.
• 3/8" hex drive design allows for high torque application with standard tools, facilitating quick and secure installations.
• Partially threaded shank enables precise clamping force control, ideal for applications where unthreaded grip length is critical.
• Compliance with ASME B18.3, ASTM A574, and ASTM B117 ensures consistent quality and interoperability with other standardized components.

Professional Applications & Engineering Value

This zinc-flake-coated alloy steel socket head cap screw is engineered to address common industrial challenges such as joint loosening under dynamic loads and corrosion-induced degradation. The coarse UNC thread and Class 3A fit provide rapid assembly with high clamp load retention, making it suitable for heavy machinery, structural frames, and automotive assemblies where vibration resistance is critical. The partially threaded design concentrates stress away from the thread roots, reducing the risk of fatigue failure in cyclic loading conditions. Combined with its 170,000 psi tensile strength and corrosion-resistant coating, this fastener delivers long-term reliability in demanding environments like outdoor equipment, marine applications, and chemical processing plants, ensuring reduced downtime and maintenance costs.

Specification Summary & Compliance

This socket head cap screw features a 1/2"-13 UNC coarse thread with Class 3A thread fit for precise dimensional accuracy. It is manufactured in accordance with ASME B18.3 and material specifications ASTM A574, with corrosion testing per ASTM B117. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety standards for industrial use.