S-97972A215 5/16"-18 x 1 1/4" Extreme-Strength Steel Flanged Hex Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 180,000 PSI ensures reliable performance under heavy loads and prevents fastener failure in demanding applications.
• Superior corrosion resistance from the black-oxide steel coating extends service life and reduces maintenance needs in harsh or outdoor environments.
• High hardness rating (Rockwell C38) provides excellent wear resistance and durability, maintaining thread integrity through repeated use.
• Coarse UNC threading with Class 2A fit allows for faster assembly, easier alignment, and reliable engagement in a wide range of materials.
• Integrated flange design eliminates the need for a separate washer, distributes clamping force evenly, and speeds up installation.
• Fully threaded shank offers maximum grip length and holding power along the entire fastener for secure connections.
• External hex drive enables high-torque installation with common tools, ensuring tight, secure fastening in industrial settings.

Professional Applications & Engineering Value

Engineered for heavy-duty industrial applications, these black-oxide steel hex head screws address critical challenges in machinery assembly, construction, and automotive sectors. The coarse UNC thread and Class 2A fit provide quick, reliable fastening even in materials prone to stripping or where vibration is a concern. The flanged design increases bearing surface area, reducing point stress and preventing surface damage. Combined with a corrosion-resistant black-oxide finish, these screws deliver long-term reliability in environments exposed to moisture, chemicals, or temperature fluctuations, minimizing downtime and replacement costs.

Specification Summary & Compliance

This 5/16"-18 UNC hex head screw features a Class 2A thread fit for consistent interchangeability and ease of assembly. It is manufactured to standard inch dimensions, including a 1-1/4" length and 5/8" flange diameter. The screw is fully threaded and complies with common industrial standards for UNC coarse threading. Materials and finishes are selected to meet industry requirements for performance and are RoHS and REACH compliant, ensuring suitability for various engineering and manufacturing applications.