S-90399A242 Length 1/2" Tapping Screws

Key Features & Benefits at a Glance

• Enhanced Load Distribution - Wide truss head design with integrated steel washer spreads clamping force over larger surface area, reducing material stress in sheet metal applications
• Superior Corrosion Resistance - Black-phosphate steel construction provides durable protection against rust and environmental degradation in industrial settings
• Optimized Thread Engagement - Thread forming A/AB tapping design with 12 threads per inch creates strong, permanent threads in sheet metal without requiring pre-tapped holes
• Maximum Driving Efficiency - No. 2 Phillips drive ensures secure tool engagement and prevents cam-out during high-torque installation
• Complete Material Penetration - Fully threaded design with pointed tip allows for smooth entry and maximum thread contact throughout the entire 1/2" length
• Precision Installation Compatibility - Specifically engineered for use with No. 21 drill bit (0.159" diameter) in materials up to 0.025" thickness
• Secure Fastening Performance - Right-hand thread direction with 0.19" diameter provides reliable, vibration-resistant connections in demanding applications

Professional Applications & Engineering Value

These No. 10 Phillips truss head tapping screws deliver exceptional engineering value in sheet metal fabrication and industrial assembly applications. The thread forming design eliminates the need for separate tapping operations, significantly reducing installation time and labor costs. The black-phosphate steel construction combined with the integrated flat steel washer creates a complete fastening system that prevents loosening under vibration and distributes load effectively across thin materials. The fully threaded configuration ensures maximum pull-out resistance in sheet metal up to 0.025" thickness, making these A/AB tapping screws ideal for HVAC systems, electrical enclosures, automotive components, and construction applications where reliable, permanent fastening is critical.

Specification Summary & Compliance

These thread forming sheet metal screws feature precise Class 2A thread tolerances with 12 threads per inch and 0.19" thread diameter. Manufactured to industry-standard A/AB tapping screw specifications with right-hand threading and pointed tip for optimal performance. The fasteners comply with relevant industrial standards for sheet metal applications and are compatible with standard No. 21 drill bits (0.159" diameter). The black-phosphate surface treatment provides corrosion protection while maintaining dimensional accuracy for consistent installation performance across production runs.