S-90627A138 Length 3/4" ASME B18.6.3 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black zinc-plated steel construction, extending service life in demanding industrial environments.
• Efficient thread forming action using DST technology creates strong, reliable threads in plastic without pre-tapping, reducing assembly time and tooling costs.
• Secure, slip-resistant installation provided by the Phillips No. 2 drive, ensuring consistent torque application and reducing the risk of cam-out.
• Maximum holding power from fully threaded design and 16 threads per inch, delivering uniform stress distribution and excellent pull-out resistance in plastic substrates.
• Optimized for plastic assembly with a blunt tip that minimizes material cracking or splitting during installation, preserving structural integrity.
• Broad compatibility with standard No. 19 drill bits (0.166" diameter), simplifying hole preparation and ensuring precise fit in various plastic materials.
• Reliable performance assurance through compliance with ASME B18.6.3 specifications, guaranteeing dimensional accuracy and mechanical consistency for industrial applications.

Professional Applications & Engineering Value

This thread forming screw is specifically engineered to address common fastening challenges in plastic assembly, where traditional fasteners may cause stress cracking or insufficient holding strength. The DST type thread forming design displaces material rather than cutting it, creating a zero-clearance fit that enhances vibration resistance and prevents loosening under dynamic loads. Made from black zinc-plated steel, it offers a durable, corrosion-resistant solution for electronics enclosures, automotive trim, and consumer products. The combination of a Phillips pan head and fully threaded No. 12 size ensures easy installation and maximum engagement in thermoplastic and thermoset materials, reducing the need for additional inserts or adhesives. This screw delivers consistent industrial-grade performance, streamlining production while maintaining joint integrity in demanding plastic fastening applications.

Specification Summary & Compliance

This product adheres to ASME B18.6.3 standards for dimensional and mechanical requirements, ensuring reliable performance in industrial settings. Key specifications include a thread diameter of 0.216" with 16 threads per inch, a No. 2 Phillips drive, and a 3/4" length with full threading for uniform load distribution. The black zinc plating provides enhanced corrosion protection, while the thread forming DST design complies with industry-accepted tapping methods for plastic materials. Manufactured to precise inch system tolerances, this screw is ideal for applications requiring consistent fit and long-term durability.