S-99512A219 Length 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Superior torque transmission with Torx Plus IP10 drive, minimizing cam-out for reliable installation and reduced tool wear
• Exceptional holding power in plastic materials thanks to the Tri-Lobe shank design that prevents rotation and pull-out
• Durable corrosion resistance provided by zinc-plated steel construction, extending service life in various environments
• Efficient thread forming creates strong, permanent threads in plastic without chips, ensuring secure fastening
• Wide compatibility with standard No. 37 drill bits (0.104" diameter) for easy integration into existing assembly processes
• Full compliance with industrial safety standards including RoHS 3 and REACH, making them suitable for regulated applications
• Optimized for plastic assembly with right-hand threading and blunt tip for precise positioning and reduced material stress

Professional Applications & Engineering Value

These No. 4-20 TRS tapping screws are specifically engineered for plastic fastening applications where reliability and material integrity are critical. The thread forming design eliminates chips during installation, preventing contamination and ensuring clean, secure threads in plastic materials. The Tri-Lobe shank cross-section provides superior resistance to rotation and pull-out forces, while the Torx Plus IP10 drive system delivers maximum torque transfer with minimal slippage. This combination addresses common industrial challenges such as stripped heads, material cracking, and inconsistent clamping force, making these zinc-plated steel screws ideal for automotive trim, electronic enclosures, and consumer product assemblies where vibration resistance and long-term performance are essential.

Specification Summary & Compliance

This No. 4-20 x 1/2" tapping screw features a 0.112" thread diameter with 20 threads per inch and Class 2A thread tolerances for precise fit. The TRS (Thread Rolling Screw) type follows standard thread forming specifications for plastic applications. Manufacturing complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industrial compliance. The pan head design with 0.219" diameter and Torx Plus T10/IP10 drive meets industry standards for drive compatibility and performance.