S-91274A428 1/2"-13 x 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 industrial applications, reducing the risk of fastener failure.
• Superior corrosion resistance from the Zinc-Flake coating protects against harsh environments, extending service life and minimizing maintenance needs.
• Precision Class 3A thread fit provides secure, vibration-resistant connections, enhancing assembly integrity and reducing loosening over time.
• High hardness rating (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use and installation.
• 3/8" hex drive design allows for easy installation and removal with standard tools, improving workflow efficiency in tight spaces.
• Full threading along the entire length ensures maximum grip and adjustability, suitable for a wide range of material thicknesses.
• Compliance with major industry standards including ASME B18.3 and ASTM A574 guarantees consistent quality and interoperability in professional settings.

Professional Applications & Engineering Value

Engineered for demanding environments, this Zinc-Flake-Coated Alloy Steel Socket Head Cap Screw addresses critical industrial challenges such as vibration-induced loosening and corrosive degradation. The coarse UNC threading and Class 3A fit provide superior holding power in machinery, automotive assemblies, and heavy equipment, where precise torque and durability are paramount. The combination of high tensile strength and corrosion-resistant coating ensures long-term reliability in outdoor or chemically exposed settings, reducing downtime and replacement costs. Ideal for applications requiring socket head accessibility and robust fastening solutions, it supports efficient maintenance and assembly processes across various sectors.

Specification Summary & Compliance

This screw features a 1/2"-13 UNC coarse thread with Class 3A precision fit, ensuring tight tolerances for secure fastening. It meets ASME B18.3 and ASTM A574 specifications for dimensional accuracy and material integrity, along with ASTM B117 for corrosion testing. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible and safe usage in industrial supply chains.