S-92400A130 Length 3/8" Tapping Screws

Key Features & Benefits at a Glance

• Superior holding power in plastic through the tri-lobe shank design that displaces material to form strong, permanent threads without pre-drilling.
• Enhanced corrosion resistance provided by the zinc-plated steel construction, ensuring long-term reliability in various industrial environments.
• Efficient installation with standard tools thanks to the external hex head, allowing for high-torque application and quick, secure fastening.
• Reduced risk of material cracking as the thread forming (TRS) action and blunt tip minimize stress and create clean, high-strength threads in plastic substrates.
• Full-length threading for maximum grip across the entire 3/8" length, providing consistent clamping force and vibration resistance in assemblies.
• Precision fit with recommended No. 44 drill bit (0.086" diameter), ensuring optimal performance and thread engagement for No. 4-20 size applications.
• Compliance with global environmental standards including RoHS 3 and REACH, making these screws safe for use in regulated industries and international markets.

Professional Applications & Engineering Value

This No. 4-20 TRS thread forming screw is specifically engineered to address common fastening challenges in plastic components, where traditional screws may strip threads or cause material failure. The tri-lobe shank cross-section and thread forming design enable the screw to cold-form mating threads in ductile plastics, eliminating the need for tapped holes and reducing assembly time and cost. Made from zinc-plated steel, it offers excellent resistance to corrosion, which is critical in environments exposed to humidity or chemicals. The external hex drive and fully threaded body ensure high torque capability and uniform stress distribution, preventing loosening under vibration. Ideal for electronics enclosures, automotive trim, and consumer products, this screw provides reliable, long-lasting fastening without compromising plastic integrity.

Specification Summary & Compliance

This screw adheres to inch system measurements with a No. 4-20 thread (0.112" diameter, 20 TPI) and 3/8" length. It features a Class 2A thread fit for standard applications, a hex head (0.188" width, 0.079" height), and is fully threaded with a blunt tip. Manufactured to industry standards for thread forming screws (TRS type), it is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material restrictions are met for global supply chains.