S-99512A663 Length 1 1/4" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel coating for extended service life in demanding environments
• Maximum torque transmission through T10 Torx drive design, reducing cam-out and tool wear
• Reliable thread forming with Tri-Lobe shank that creates strong, permanent threads in plastic materials
• Enhanced assembly efficiency with fully threaded design and blunt tip for easier starting and consistent engagement
• Secure fastening in plastic using thread forming technology that eliminates the need for separate tapping operations
• Industry compliance assurance meeting RoHS 3 and REACH environmental standards for global applications
• Optimized plastic compatibility with No. 4-20 thread size specifically engineered for plastic assembly requirements

Professional Applications & Engineering Value

These Black-Oxide Steel TRS tapping screws are specifically engineered to address common challenges in plastic assembly applications. The Tri-Lobe shank design displaces plastic material during installation, creating strong, permanent threads that resist loosening from vibration and thermal cycling. The T10 Torx drive system provides superior torque transmission compared to traditional drive types, minimizing strip-out and ensuring consistent clamping force. The fully threaded configuration with blunt tip facilitates easier starting and prevents material cracking in brittle plastics. These thread forming screws eliminate the need for separate tapping operations, reducing assembly time and costs while providing reliable performance in automotive components, electronic enclosures, and industrial plastic assemblies where vibration resistance and long-term reliability are critical.

Specification Summary & Compliance

These No. 4-20 x 1-1/4" tapping screws feature standard inch measurements with fully threaded right-hand orientation and are designed for use with No. 37 drill bits (0.104" diameter). The TRS (Thread Rolling Screw) thread forming technology creates strong, permanent threads in plastic materials without generating chips. Manufactured to industry standards for thread forming screws in plastic applications, these fasteners are fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring they meet current global compliance requirements for industrial and commercial use.