S-99397A061 Length 3 mm Tapping Screws

Key Features & Benefits at a Glance

• Superior torque transmission and anti-camout performance with the Torx Plus IP6/T6 drive, reducing tool slippage and assembly damage in high-torque applications.
• Excellent corrosion resistance and durability provided by 18-8 Stainless Steel material, ensuring long-term reliability in various environments.
• Secure, high-strength fastening in plastic materials through the thread-forming (TRS) Tri-Lobe shank design, which creates strong, load-bearing threads without pre-tapping.
• Reduced risk of material cracking or stress due to the controlled thread forming action and blunt tip, ideal for delicate plastic components.
• Streamlined assembly process and consistent seating with the standard pan head profile, offering a low-profile, finished appearance and good bearing surface.
• Precise, reliable fastening with full threading and a 0.79mm pitch, ensuring maximum thread engagement and pull-out strength in short 3mm lengths.
• Compliance with major environmental regulations including RoHS 3 and REACH, making it suitable for global supply chains and sensitive applications.

Professional Applications & Engineering Value

This M1.91 x 3mm thread forming screw is engineered to solve critical fastening challenges in plastic assemblies. Its 18-8 Stainless Steel construction provides the necessary corrosion resistance for demanding environments, while the Tri-Lobe shank and thread forming (TRS) design displace plastic material to create strong, permanent internal threads without generating chips. This eliminates the need for pre-tapped holes, reduces assembly steps, and minimizes the risk of stress cracking in brittle plastics. The Torx Plus drive (IP6/T6) ensures maximum torque transfer and driver bit engagement, preventing camout during high-speed installation and reducing operator fatigue. Ideal for electronics enclosures, automotive trim, and consumer goods where reliable, vibration-resistant fastening in plastic is paramount.

Specification Summary & Compliance

This metric tapping screw features a M1.91 screw size, 3mm length, and fully threaded right-hand design with an approximate thread pitch of 0.79mm. It has a standard pan head with a 4mm diameter and 1.6mm height, and is designed for use with a No. 51 drill bit (0.067" diameter). The screw conforms to typical thread-forming screw standards for dimensional accuracy. It is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting stringent environmental and safety regulations for hazardous substances.