S-90385A331 Length 1/2" 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 industrial environments.
• Efficient thread forming using DST design to create strong, reliable threads in plastic materials without pre-tapping, reducing assembly time and costs.
• Secure fastening with Phillips drive (No. 1 size) for easy installation and reduced risk of cam-out, improving operator efficiency.
• Optimized for plastic applications with a blunt tip and fully threaded 1/2" length, minimizing material stress and preventing cracking during installation.
• High thread engagement with 20 threads per inch and 0.125" diameter, providing excellent pull-out strength and vibration resistance in plastic assemblies.
• Standard pan head profile offers a low-profile, rounded design for smooth surface finishes and enhanced aesthetic integration.
• Compliance with ASME B18.6.3 standards ensures consistent quality, dimensional accuracy, and reliability for industrial use.

Professional Applications & Engineering Value

These No. 5 zinc-plated steel tapping screws are engineered to address common challenges in plastic fastening, such as material brittleness and thread stripping. The DST thread forming method creates durable threads by displacing plastic material, which enhances holding power and reduces the need for inserts or adhesives. Made from zinc-plated steel, they resist corrosion in humid or demanding environments, extending service life in plastic assembly applications like electronics enclosures, automotive components, and consumer products. The Phillips drive and blunt tip design allow for straightforward installation with standard tools, minimizing assembly errors and improving production throughput. Ideal for high-volume manufacturing, these screws deliver reliable performance where vibration resistance and thread integrity are critical.

Specification Summary & Compliance

This product features a thread diameter of 0.125" with approximately 20 threads per inch, a 1/2" length, and a pan head style with standard dimensions (0.219" head diameter, 0.08" head height). It complies with ASME B18.6.3 specifications for dimensional accuracy and performance, ensuring consistent fit and function. The screw is designed for use with a No. 39 drill bit (0.0995" diameter) and is fully threaded for maximum grip. Materials and manufacturing processes adhere to industry standards for reliability in plastic fastening applications.