S-90398A151 Length 3/4" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with chrome-plated steel construction for extended service life in demanding industrial environments
• Enhanced load distribution through integrated 1/2" flat steel washer that prevents surface damage and maintains joint integrity
• Optimized thread-forming design creates permanent, vibration-resistant threads in sheet metal without requiring pre-tapped holes
• Wide truss head profile provides larger bearing surface for improved clamping force and reduced risk of pull-through
• No. 2 Phillips drive ensures common tool compatibility while delivering efficient torque transfer during installation
• Fully threaded shank maximizes grip length and holding power across the entire fastener engagement area
• Precision-engineered dimensions with 0.138" diameter and 18 TPI for consistent performance in standardized sheet metal applications

Professional Applications & Engineering Value

These chrome-plated steel tapping screws are specifically engineered to address common challenges in sheet metal fabrication and assembly. The thread-forming A/AB type design eliminates the need for separate tapping operations, significantly reducing installation time and labor costs while creating strong, permanent threads that resist vibration loosening. The combination of Phillips truss head with integrated flat steel washer provides exceptional bearing surface distribution, preventing material deformation in thin-gauge metals up to 0.025" thickness. This makes them ideal for HVAC systems, electrical enclosures, automotive panels, and industrial equipment where reliable fastening and corrosion resistance are critical for long-term performance in challenging environments.

Specification Summary & Compliance

Manufactured to precise dimensional standards with 0.138" thread diameter, 18 TPI thread pitch, and 3/4" length for consistent performance. Features right-hand threads with thread-forming technology compliant with standard A/AB tapping screw specifications. The chrome-plated steel construction meets industry requirements for corrosion resistance, while the integrated steel flat washer ensures proper load distribution. Designed for use with No. 32 drill bit (0.116" diameter) for optimal hole preparation in sheet metal applications up to 0.025" maximum drilling thickness.