S-90399A151 Length 3/4" Tapping Screws

Key Features & Benefits at a Glance

• Enhanced corrosion resistance with black-phosphate steel construction for extended service life in demanding industrial environments
• Superior load distribution through integrated flat steel washer (1/2" OD) that prevents surface damage and maintains joint integrity
• Optimized thread-forming design with A/AB tapping screw profile creates strong, permanent threads in sheet metal up to 0.025" thickness
• Wide truss head profile provides larger bearing surface for improved clamping force and reduced installation stress
• Precision Phillips No. 2 drive ensures secure tool engagement and minimizes cam-out during high-torque applications
• Full threading along the entire 3/4" length delivers maximum grip strength and uniform stress distribution
• Right-hand thread configuration with 18 TPI ensures reliable, vibration-resistant fastening in sheet metal assemblies

Professional Applications & Engineering Value

These No. 6 Phillips truss head tapping screws are specifically engineered for sheet metal applications where reliable fastening and corrosion resistance are critical. The thread-forming design eliminates the need for pre-tapped holes, creating strong, permanent threads in materials up to 0.025" thickness while reducing installation time and labor costs. The combination of black-phosphate steel construction and integrated flat steel washer provides exceptional protection against environmental factors while preventing surface damage and maintaining joint integrity under vibration and dynamic loads. Ideal for HVAC systems, electrical enclosures, automotive panels, and industrial equipment where sheet metal fasteners must withstand demanding conditions without compromising performance.

Specification Summary & Compliance

Manufactured to precise dimensional standards with 0.138" thread diameter and 18 threads per inch configuration. These thread-forming screws comply with A/AB tapping screw specifications and are designed for use with No. 32 drill bit (0.116" diameter). The black-phosphate surface treatment provides superior corrosion resistance, while the fully threaded design ensures consistent performance across the entire fastener length. Meets industry standards for sheet metal fastening applications and manufactured using quality-controlled processes for reliable performance in professional and industrial settings.