S-90385A343 Length 5/16" ASME B18.6.3 Tapping Screws

Key Features & Benefits at a Glance

• Superior holding power in plastics through advanced thread forming technology that creates strong, permanent threads without chipping or cracking materials
• Enhanced corrosion resistance with zinc-plated steel construction, ensuring long-term durability in various industrial environments
• Optimized drive efficiency with Phillips No. 2 drive style providing secure tool engagement and reduced cam-out during installation
• Maximum thread engagement with fully threaded design that distributes load evenly along the entire fastener length
• Precision installation guidance with recommended No. 30 drill bit (0.1285") for proper hole preparation and optimal performance
• Industry-standard compliance meeting ASME B18.6.3 specifications for consistent quality and reliable performance
• Versatile pan head design with rounded profile offering good bearing surface and clean appearance in finished assemblies

Professional Applications & Engineering Value

These No. 8 x 5/16" zinc-plated steel DST tapping screws are specifically engineered to address common challenges in plastic fastening applications. The thread forming technology eliminates the need for pre-tapped threads while preventing material stress cracks that often occur with traditional tapping methods. The fully threaded design with 18 threads per inch provides superior pull-out resistance in thermoplastic and thermoset materials, making them ideal for electronic enclosures, automotive trim, consumer products, and industrial equipment. The combination of zinc-plated steel construction and Phillips No. 2 drive ensures reliable performance in high-volume assembly operations while maintaining corrosion protection in demanding environments.

Specification Summary & Compliance

These thread forming screws feature precise 0.164" thread diameter with 18 threads per inch and right-hand threading in accordance with ASME B18.6.3 specifications. The DST (Thread Forming) design with blunt tip and rounded pan head (0.27" diameter) ensures proper material displacement during installation. Manufactured to exacting standards with Class 2A thread tolerances for consistent performance. Recommended for use with No. 30 drill bit (0.1285" diameter) for optimal hole preparation in plastic materials.