S-90086A641 1/4"-20 x 5" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Corrosion-resistant zinc plating extends service life in industrial environments
• Thread-cutting Type F design creates precise mating threads in aluminum, brass, and cast iron without pre-tapping
• 82° countersink angle with flat head provides flush mounting in sheet metal applications
• Full-length UNC coarse threading ensures maximum grip strength and faster installation
• Phillips No. 3 drive system delivers secure torque transmission with standard tools
• ASME B18.6.3 compliance guarantees dimensional accuracy and reliable performance
• 5-inch length with blunt tip offers optimal penetration depth while preventing material splitting

Professional Applications & Engineering Value

These zinc-plated steel tapping screws solve critical fastening challenges in metal fabrication and assembly operations. The thread-cutting Type F design with UNC coarse threads eliminates the need for separate tapping operations, significantly reducing installation time and labor costs in aluminum, brass, cast iron, and sheet metal applications. The 82° countersink angle combined with the flat head profile ensures seamless surface finishing while the full threading provides uniform stress distribution across the entire fastener length. Engineered for high-volume production environments, these Phillips drive screws maintain consistent performance in automated assembly systems while meeting stringent industrial standards.

Specification Summary & Compliance

Manufactured to ASME B18.6.3 specifications with UNC 1/4"-20 coarse thread profile and Class 2A tolerance for reliable interchangeability. Features standard 82° countersink angle and complies with RoHS 3 (2015/863/EU) environmental regulations. The zinc-plated steel construction provides corrosion protection while maintaining the mechanical properties required for thread-cutting applications in various metal substrates.