S-91274A500 1/2"-13 x 5" 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.
• Precise Class 3A thread fit provides tighter tolerances for secure fastening and vibration resistance in demanding assemblies.
• Partially threaded design allows for controlled clamping force and easier alignment in machinery and structural components.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
• 3/8" hex drive compatibility enables efficient installation with standard tools, speeding up assembly processes.
• Compliance with ASME B18.3 and ASTM A574 guarantees consistent quality and interoperability in professional engineering projects.

Professional Applications & Engineering Value

This zinc-flake-coated alloy steel socket head cap screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery manufacturing, automotive assemblies, and construction equipment. The 1/2"-13 UNC coarse thread and Class 3A thread fit ensure rapid installation and superior resistance to loosening under dynamic loads, while the partially threaded rod type provides optimal stress distribution. The zinc-flake coating delivers robust corrosion protection, making it ideal for environments exposed to moisture or chemicals. With a high tensile strength of 170,000 psi, it supports structural integrity in applications requiring reliable, long-term fastening solutions without compromising on durability or compliance with industry standards.

Specification Summary & Compliance

This socket head cap screw features a 1/2"-13 UNC coarse thread with Class 3A precision fit for accurate engagement and consistent performance. It adheres to ASME B18.3 and ASTM A574 manufacturing specifications, ensuring dimensional accuracy and material reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible and safe usage in global industrial markets.