S-99397A221 Length 3 mm Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, ensuring long-term reliability in various industrial environments.
• Enhanced torque transmission and reduced cam-out thanks to the Torx Plus IP6 drive, providing secure installation and minimizing tool slippage.
• Excellent holding power in plastic materials through the thread-forming TRS design and tri-lobe shank, which creates strong, reliable threads without pre-tapping.
• Consistent and precise fastening with a 0.79mm pitch and fully threaded M1.91 size, delivering uniform clamping force in plastic assemblies.
• Easy installation and reduced assembly time due to the blunt tip and standard pan head, allowing for straightforward placement and driving.
• Compliance with stringent environmental regulations, including RoHS 3 and REACH, ensuring safe and sustainable use in global markets.
• Versatile application in plastic components, ideal for electronics, automotive, and consumer goods where reliable, vibration-resistant fastening is critical.

Professional Applications & Engineering Value

Engineered for demanding plastic applications, these M1.91 x 3mm zinc-plated steel tapping screws address common challenges like material cracking and weak thread retention. The thread-forming TRS design with a tri-lobe shank displaces plastic material to form durable, high-strength threads, eliminating the need for separate inserts and reducing assembly costs. Combined with the Torx Plus IP6 drive, they ensure maximum torque transfer and minimize stripping in sensitive components, making them ideal for electronics enclosures, automotive trim, and consumer appliances. The 0.79mm pitch and fully threaded body provide consistent engagement, enhancing vibration resistance and long-term performance in dynamic environments.

Specification Summary & Compliance

This M1.91 x 3mm screw features a metric system with precise dimensions, including a 4mm head diameter and 1.6mm head height. It adheres to standard thread-forming TRS specifications with a right-hand thread direction and is designed for use with a No. 51 drill bit (0.067" diameter). The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industrial reliability.