S-90385A319 Length 1/8" ASME B18.6.3 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with zinc-plated steel construction, ensuring long-lasting performance in various environments.
• Efficient thread forming design creates strong, reliable threads in plastic materials without pre-tapping, reducing assembly time and costs.
• Optimized for plastic applications with a blunt tip and fully threaded shank to prevent material cracking and ensure secure fastening.
• Easy installation and removal thanks to the Phillips No. 1 drive, providing better torque transfer and reducing cam-out risks.
• Precise fit and compatibility with standard No. 44 drill bits (0.086" diameter), ensuring accurate hole preparation and consistent results.
• High durability and load distribution from the pan head design, which offers a low profile and increased bearing surface.
• Industry-standard compliance with ASME B18.6.3 specifications, guaranteeing consistent quality and reliability for industrial use.

Professional Applications & Engineering Value

This No. 4-24 thread forming tapping screw is specifically engineered for plastic fastening applications, where traditional screws may cause splitting or stripping. Made from zinc-plated steel, it provides excellent corrosion resistance, ideal for outdoor or humid conditions. The thread forming (DST type) design displaces material to form strong internal threads, eliminating the need for separate tapping operations and reducing assembly steps. With a fully threaded blunt tip, it minimizes stress concentration in brittle plastics, preventing cracks and ensuring a secure hold. The Phillips drive allows for quick installation with standard tools, enhancing productivity in industrial fastener setups like electronics enclosures, automotive components, and consumer goods. Compliant with ASME B18.6.3, it meets rigorous standards for dimensional accuracy and performance, making it a trusted choice for engineers seeking reliability and efficiency in plastic assemblies.

Specification Summary & Compliance

This screw features a No. 4-24 thread size with a 0.112" thread diameter and approximately 24 threads per inch, ensuring precise fit in plastic materials. It is fully threaded with a right-hand thread direction and round shank cross-section for consistent performance. The design complies with ASME B18.6.3 standards, covering dimensional tolerances and mechanical properties. Additionally, the zinc-plated finish supports RoHS and REACH compliance by reducing environmental impact, while the specified No. 44 drill bit size (0.086" diameter) ensures proper hole preparation for optimal thread engagement and durability.