S-91274A496 1/2"-13 x 4 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 extends service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 3A thread fit guarantees secure, vibration-resistant connections, enhancing assembly integrity.
• High hardness (Rockwell C37) provides excellent wear resistance, maintaining thread integrity through repeated use.
• 3/8" hex drive design allows for easy installation and removal with standard tools, improving workflow efficiency.
• Partially threaded shank offers optimal grip and alignment in fastened joints, preventing loosening under dynamic loads.
• Compliance with ASME B18.3 and ASTM A574 ensures consistent quality and interchangeability, supporting standardized engineering requirements.

Professional Applications & Engineering Value

This 1/2"-13 UNC Socket Head Cap Screw is engineered to address critical challenges in heavy-duty industrial settings, such as machinery assembly, automotive systems, and structural frameworks. The zinc-flake-coated alloy steel construction combats corrosion and wear, prolonging component life in demanding conditions. With a coarse thread spacing and right-hand thread direction, it facilitates quick installation and robust clamping force, reducing assembly time while maintaining joint security. The partially threaded rod type ensures precise engagement, minimizing stress concentration and enhancing fatigue resistance. Ideal for applications requiring high tensile strength and durability, this screw delivers reliable performance in environments exposed to vibration, heavy loads, and corrosive elements.

Specification Summary & Compliance

This product adheres to Class 3A thread fit for precise dimensional accuracy and UNC thread type with coarse spacing per standard specifications. It meets ASME B18.3 and ASTM A574 manufacturing standards, ensuring consistent quality and performance. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it supports environmentally responsible and safe industrial use.