S-91274A464 1/2"-13 x 2 1/4" 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 extends service life in harsh industrial environments, minimizing maintenance needs.
• Precise Class 3A thread fit provides consistent engagement and vibration resistance, enhancing assembly reliability.
• Coarse UNC threading allows for quicker installation and easier alignment, saving time during assembly processes.
• High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
• Partially threaded design enables secure clamping where needed while allowing clearance in non-threaded sections for versatile applications.
• Compliance with ASME B18.3 and ASTM A574 guarantees consistent quality and interchangeability, ensuring compatibility with standard tools and components.

Professional Applications & Engineering Value

This Socket Head Cap Screw is engineered to address critical challenges in heavy-duty machinery, automotive assemblies, and structural frameworks where vibration and dynamic loads are prevalent. The zinc-flake-coated alloy steel construction provides a robust barrier against corrosion, significantly reducing downtime in corrosive environments like outdoor equipment or chemical processing plants. Its coarse UNC threading and Class 3A thread fit ensure rapid, secure fastening without cross-threading, while the partially threaded rod type allows for precise load distribution. Ideal for high-strength bolting in construction, aerospace, and manufacturing, this screw delivers consistent performance under extreme conditions, backed by rigorous standards to meet industrial demands.

Specification Summary & Compliance

This screw adheres to ASME B18.3 and ASTM A574 specifications, ensuring dimensional accuracy with a Class 3A thread fit and UNC coarse threads for reliable engagement. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmental and safety standards in global supply chains.