S-99461A409 Length 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh or outdoor plastic applications.
• Excellent thread-forming action with the Tri-Lobe shank design, creating strong, reliable threads in plastic without chips.
li>Secure and efficient installation provided by the Phillips No. 2 drive, minimizing cam-out for consistent torque application.
• Optimized for plastic fastening with a 16 TPI thread pitch and blunt tip to prevent material cracking and ensure precise alignment.
• Wide compatibility with a standard No. 29 drill bit (0.136" diameter), simplifying the pre-drilling process.
• Reliable holding power from the fully threaded design and rounded pan head, which provides a low-profile, finished appearance.
• Compliance with major environmental regulations including RoHS 3 and REACH, ensuring safety and suitability for various industries.

Professional Applications & Engineering Value

These No. 8 x 1/2" thread forming screws are engineered to address common challenges in plastic fastening, such as material stress, strip-out, and corrosion. The TRS (Thread Rolling Screw) type with its Tri-Lobe shank cross-section displaces plastic material during installation, forming robust internal threads that significantly increase pull-out strength and vibration resistance compared to cutting screws. Manufactured from 316 stainless steel, they offer exceptional durability in corrosive environments, making them perfect for plastic assembly in electrical enclosures, automotive components, and marine equipment. The combination of a Phillips drive and specified drill bit size ensures quick, reliable installations, reducing assembly time and improving production efficiency.

Specification Summary & Compliance

This screw conforms to standard inch measurements with a No. 8 screw size, 1/2" length, and 16 threads per inch (TPI). The thread forming (non-cutting) tapping method and right-hand thread direction are designed for optimal performance in plastic substrates. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and suitable for use in regulated markets.