S-90385A335 Length 7/8" ASME B18.6.3 Tapping Screws

Key Features & Benefits at a Glance

• Superior thread forming design creates strong, reliable threads in plastic materials without pre-tapping, reducing assembly time and labor costs.
• Zinc-plated steel construction provides excellent corrosion resistance for extended service life in demanding industrial environments.
• Phillips No. 2 drive system ensures secure tool engagement and prevents cam-out during installation for consistent, efficient fastening.
• Full threading with 19 TPI delivers maximum grip strength and uniform stress distribution across the entire fastener length.
• Blunt tip and pan head design prevents material splitting while offering a low-profile finish that sits flush against surfaces.
• Optimized for No. 35 drill bit compatibility simplifies installation planning and ensures proper hole sizing for secure fastening.
• ASME B18.6.3 compliance guarantees consistent quality, dimensional accuracy, and reliable performance in industrial applications.

Professional Applications & Engineering Value

These thread forming tapping screws are specifically engineered for plastic assembly applications where material integrity and joint reliability are critical. The zinc-plated steel construction combined with the DST thread forming design creates permanent, high-strength threads in thermoplastic materials without causing stress cracks or material failure. The fully threaded configuration ensures maximum pull-out resistance, making these No. 6 screws ideal for electronic enclosures, automotive plastic components, and consumer product assemblies. The Phillips drive provides reliable installation torque transfer, while the rounded pan head offers a clean, finished appearance. These tapping screws solve common plastic fastening challenges by eliminating the need for separate tapping operations and providing consistent, repeatable performance in high-volume manufacturing environments.

Specification Summary & Compliance

These No. 6 x 7/8" thread forming screws feature precise dimensional accuracy with 0.138" thread diameter and 19 TPI thread pitch. The fasteners maintain Class 2A thread tolerances and comply with ASME B18.6.3 specifications for mechanical and dimensional requirements. The zinc-plated surface treatment provides corrosion protection, while the DST thread forming design ensures optimal performance in plastic materials. These screws are manufactured to meet industrial quality standards and are compatible with No. 35 drill bits (0.11" diameter) for proper installation in plastic assembly applications.