S-99512A658 Length 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-oxide steel construction, ensuring long-term reliability in various environmental conditions
• Enhanced torque transmission and reduced cam-out thanks to the T10 Torx drive, allowing for secure installation and higher tightening forces
• Strong, permanent threads in plastic materials achieved through the thread-forming TRS design, eliminating the need for pre-tapped holes
• Secure fastening with minimal stress due to the tri-lobe shank cross-section, which displaces material evenly to prevent cracking in plastics
• Wide compatibility and easy installation with a standard pan head and fully threaded No. 4-20 size, suitable for use with a No. 37 drill bit
• Compliance with environmental regulations including RoHS 3 and REACH, making them safe for use in regulated industries
• Durable and reusable fastening solution with a blunt tip and right-hand thread, providing consistent performance in plastic assembly applications

Professional Applications & Engineering Value

These No. 4-20 x 1/2" black-oxide steel TRS tapping screws are specifically engineered for plastic fastening applications, where traditional screws may strip or fail. The thread-forming design creates robust, permanent threads by cold-forming the plastic material, reducing the risk of loosening under vibration and thermal cycling. Combined with the T10 Torx drive, they enable high-torque installation without slippage, ensuring precise and efficient assembly in industries like automotive, electronics, and consumer goods. The tri-lobe shank further enhances grip and minimizes stress concentrations, making them ideal for brittle or soft plastics where cracking is a concern. This combination of features delivers reliable, long-lasting performance in demanding environments.

Specification Summary & Compliance

This screw features a No. 4-20 thread size with approximately 20 threads per inch and a length of 1/2", fully threaded for consistent holding power. It adheres to standard inch measurements and includes a pan head with T10 Torx drive for precise torque control. The product is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for hazardous substances. Designed for use in plastics with a recommended No. 37 drill bit (0.104" diameter), it provides reliable performance in various industrial applications.