S-94209A055 4-40 x 1/4" Tapping Screws

Key Features & Benefits at a Glance

• Superior torque transmission with Torx Plus IP10 drive that minimizes cam-out and tool wear during installation
• Excellent corrosion resistance provided by zinc-plated steel construction for extended service life in industrial environments
• Reliable thread forming capability in aluminum, brass, and copper without requiring pre-tapped holes
• Enhanced driving stability through Tri-Lobe shank design that prevents spinning in softer materials
• Optimized for high-volume assembly with coarse UNC thread spacing enabling faster installation times
• Consistent performance ensured by fully threaded design and precise 1/4" length tolerance control
• Environmental compliance meeting RoHS 3 and REACH standards for global manufacturing applications

Professional Applications & Engineering Value

These 4-40 UNC Tri-Lobe tapping screws deliver exceptional engineering value in aluminum, brass, and copper applications where traditional fastening methods often fail. The thread forming design creates strong, permanent threads in softer materials without chip formation, eliminating contamination risks in sensitive assemblies. The zinc-plated steel construction provides reliable corrosion protection while maintaining the strength required for demanding industrial environments. With Torx Plus IP10 drive technology, these screws offer superior torque transfer compared to conventional drives, reducing installation time and preventing damage to fastener heads in high-volume production settings. The combination of coarse thread spacing and fully threaded design ensures rapid installation and maximum holding power across the entire fastener length.

Specification Summary & Compliance

These thread forming screws feature precision 4-40 UNC coarse threads with standard Class 2A tolerances and right-hand threading direction. The manufacturing process adheres to strict dimensional controls with length tolerance of -0.03" to 0" for consistent performance. The Tri-Lobe shank cross-section and blunt tip are engineered specifically for thread forming applications in non-ferrous materials. Compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures these fasteners meet international environmental standards for industrial use. The pan head design with standard rounded profile provides a balanced combination of low profile and sufficient bearing surface for secure fastening.