S-99512A621 Length 5/16" Tapping Screws

Key Features & Benefits at a Glance

• Superior torque transmission with T10 Torx drive, reducing cam-out and tool wear for reliable installation
• Excellent corrosion resistance from zinc-plated steel construction, ensuring longevity in various environments
• Secure fastening in plastic materials through the Tri-Lobe shank design, which forms strong threads without pre-tapping
• Reduced risk of material cracking with a blunt tip and thread-forming tapping method, ideal for brittle plastics
• Consistent performance with fully threaded design and standard pan head, providing uniform clamping force
• Environmental and safety compliance meeting RoHS 3 and REACH standards, suitable for regulated industries
• Easy installation alignment with right-hand threading and precise No. 37 drill bit compatibility, minimizing assembly errors

Professional Applications & Engineering Value

This No. 4-20 TRS tapping screw is engineered to address common challenges in plastic fastening, such as strip-out and material stress. The zinc-plated steel offers durability against moisture, while the Tri-Lobe shank and thread-forming design create robust threads in plastic substrates without requiring pre-threaded holes. This reduces assembly time and tooling costs. The T10 Torx drive ensures high torque application with minimal slippage, making it ideal for automated or high-volume production lines in electronics, automotive components, and consumer goods where plastic applications demand reliable, vibration-resistant joints.

Specification Summary & Compliance

This screw adheres to standard inch measurements with a thread diameter of 0.112" and 20 threads per inch, ensuring precise fit. It features a fully threaded, right-hand design with a pan head for consistent performance. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming it meets strict environmental and safety regulations for industrial use.