S-91465A173 1/2"-13 x 2 1/2" ASTM A307 Square Head Screws

Key Features & Benefits at a Glance

• Enhanced durability with ASTM Grade A steel construction, providing reliable performance in demanding industrial environments
• Superior torque transmission through external square drive design, ensuring secure installation with standard tools
• Optimized thread engagement with UNC coarse threading and Class 2A fit, facilitating faster assembly in various materials
• Controlled thread application through partial threading, preventing over-tightening while maintaining structural integrity
• Consistent mechanical properties with 60,000 psi tensile strength and Rockwell B69 hardness for predictable performance
• Regulatory compliance assurance meeting ASTM A307 specifications and RoHS 3 environmental standards
• Versatile installation capability with right-hand threading compatible with standard industrial practices

Professional Applications & Engineering Value

This 1/2"-13 UNC Square Head Screw delivers exceptional engineering value through its ASTM A307 Grade A steel construction and partially threaded design. The coarse UNC threading provides superior holding power in wood, metal, and construction materials, while the external square drive enables high-torque applications without cam-out issues. The 2 1/2" length with 1 1/4" minimum thread length ensures optimal engagement in structural connections, machinery assembly, and heavy equipment applications. The low strength classification makes it ideal for applications requiring controlled failure points, while maintaining the 60,000 psi tensile strength necessary for most industrial fastening requirements. This combination addresses common engineering challenges including vibration resistance, ease of installation, and long-term reliability in demanding environments.

Specification Summary & Compliance

This square head screw maintains Unified Standard Class 2A thread fit with precise 1/2"-13 UNC coarse thread specifications. Manufacturing complies with ASTM A307 standards for low carbon steel fasteners, ensuring consistent quality and performance. The product meets RoHS 3 (2015/863/EU) compliance requirements for environmental safety. Dimensional accuracy is maintained throughout with 3/4" head width and 21/64" head height for standardized tool compatibility. The inch system measurement ensures seamless integration with North American industrial specifications and replacement applications.