S-94209A065 4-40 x 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Superior torque transmission with Torx Plus IP10 drive that minimizes cam-out and tool slippage during installation
• Exceptional material compatibility with aluminum, brass, and copper applications through specialized thread forming design
• Enhanced corrosion resistance provided by zinc-plated steel construction for extended service life in industrial environments
• Reliable thread formation with Tri-Lobe shank design that creates strong, secure threads in ductile materials
• Optimized installation efficiency with coarse UNC threading and fully threaded design for faster assembly
• Precision dimensional control with length tolerance of -0.03" to 0" ensuring consistent performance
• Environmental compliance assurance meeting RoHS 3 and REACH standards for global manufacturing requirements

Professional Applications & Engineering Value

These 4-40 UNC Tri-Lobe tapping screws are engineered specifically for challenging aluminum, brass, and copper applications where traditional fastening methods often fail. The thread forming design eliminates the need for pre-tapped holes while creating stronger, more reliable threads that resist stripping and loosening under vibration. The zinc-plated steel construction provides essential corrosion protection in demanding industrial environments, while the Torx Plus IP10 drive system ensures maximum torque transfer without damaging the fastener head. This combination of features addresses common assembly challenges in electrical enclosures, HVAC systems, and precision machinery where material integrity and fastener reliability are critical to operational success.

Specification Summary & Compliance

These tapping screws feature precise UNC coarse threading with Class 2A tolerance standards, ensuring consistent performance across production runs. The Tri-Lobe shank cross-section and thread forming methodology follow established industrial fastening principles for optimal results in non-ferrous materials. Manufactured to comply with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, these screws meet international standards for restricted substances. Proper installation requires a No. 44 drill bit (0.086" diameter) to achieve the recommended fit for maximum holding power in specified materials.