S-94209A060 4-40 x 3/8" Tapping Screws

Key Features & Benefits at a Glance

• Enhanced torque transmission with Torx Plus IP10 drive, reducing cam-out and tool wear for reliable installation
• Superior corrosion resistance from zinc-plated steel construction, extending service life in demanding industrial environments
• Secure fastening in soft metals like aluminum, brass, and copper due to the Tri-Lobe thread forming design that displaces material without creating chips
• High-strength thread engagement with UNC coarse threads and full threading, ensuring vibration resistance and pull-out strength
• Streamlined assembly process using a standard No. 44 drill bit (0.086" diameter), reducing preparation time and errors
• Broad compatibility with right-hand threading and pan head profile, fitting common industrial equipment and tools
• Regulatory compliance assurance meeting RoHS 3 and REACH standards for safe, sustainable use in global markets

Professional Applications & Engineering Value

This 4-40 UNC thread forming screw is engineered to address common challenges in fastening soft metals such as aluminum, brass, and copper, where traditional screws may strip threads or require additional tapping. The Tri-Lobe shank cross-section and thread forming method create strong, permanent threads by displacing material, eliminating chips and reducing the risk of loosening under vibration. Made from zinc-plated steel, it offers durability against corrosion in humid or outdoor settings, while the Torx Plus IP10 drive ensures maximum torque application without slippage, speeding up assembly lines. Ideal for electronics enclosures, HVAC systems, and automotive components, this screw provides reliable performance in industrial applications where precision and compliance with environmental regulations like RoHS and REACH are critical.

Specification Summary & Compliance

This screw adheres to UNC coarse thread standards with a size of 4-40 and a length of 3/8", featuring a Class 2A thread fit for general use and a length tolerance of -0.03" to 0" for consistent installation. The thread forming design and blunt tip facilitate easy entry in pre-drilled holes (No. 44 drill bit, 0.086" diameter). It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of hazardous substances for safe industrial deployment.