S-90096A402 1/4"-20 x 2 1/2" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments
• Efficient self-tapping installation with Type F thread cutting design, eliminating the need for pre-tapped holes in materials like aluminum and cast iron
• Enhanced load distribution through the integrated 0.52" flange, reducing surface pressure and preventing material damage
• High-torque capability with external hex drive and 3/8" head width, ensuring secure fastening with standard tools
• Reliable coarse UNC threading (1/4"-20) providing excellent pull-out resistance in soft metals and sheet metal applications
• Full 2-1/2" threading delivers maximum grip length and uniform stress distribution along the entire fastener
• Industry-standard compliance with ASME B18.6.3 specifications, ensuring consistent performance and interchangeability

Professional Applications & Engineering Value

This heavy-duty hex flange tapping screw delivers exceptional engineering value in metal fabrication and assembly operations. The zinc-plated steel construction provides essential corrosion protection while maintaining high tensile strength for demanding applications. The Type F thread cutting design with coarse UNC threading enables efficient installation in aluminum, brass, cast iron, and sheet metal without pre-tapping, significantly reducing assembly time and labor costs. The integrated flange eliminates the need for separate washers, streamlining inventory while providing superior clamping force distribution. These fully threaded screws maintain consistent performance across their entire 2-1/2" length, making them ideal for thick material sections where maximum thread engagement is critical for structural integrity.

Specification Summary & Compliance

This 1/4"-20 hex flange tapping screw features coarse UNC threads with standard Class 2A tolerances for reliable fit and performance. Manufactured to meet ASME B18.6.3 specifications (SAE J933) for dimensional accuracy and mechanical properties. The product is RoHS 3 (2015/863/EU) compliant, ensuring environmental responsibility while maintaining industrial performance standards. Designed for use with No. 2 drill bit (0.221" diameter) for optimal thread engagement in specified materials.