S-91715A168 1/4"-20 x 1 1/2" ASME B18.6.3, SAE J933 Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black zinc-plated steel construction for extended service life in harsh industrial environments
• Efficient thread cutting capability creates precise mating threads in various materials without pre-tapping requirements
• High-strength fastening performance in aluminum, brass, cast iron, and sheet metal applications
• Optimized Phillips No. 3 drive provides secure tool engagement and reduced cam-out during installation
• Full threading design ensures maximum grip length and uniform stress distribution across the entire fastener
• Industry-standard compliance with ASME B18.6.3 and SAE J933 specifications for reliable, predictable performance
• Simplified installation process with compatible No. 1 drill bit sizing for precise hole preparation

Professional Applications & Engineering Value

These 1/4-20 UNC thread cutting tapping screws deliver exceptional engineering value in metal fabrication and assembly operations. The black zinc-plated steel construction provides essential corrosion protection while maintaining high tensile strength for demanding applications. The thread cutting design eliminates the need for separate tapping operations, significantly reducing assembly time and labor costs in aluminum, brass, cast iron, and sheet metal components. The fully threaded configuration with blunt tip ensures consistent engagement depth and prevents material splitting, while the Phillips drive system offers reliable torque transmission for high-volume production environments. These screws solve critical fastening challenges in HVAC systems, electrical enclosures, machinery guards, and structural assemblies where vibration resistance and long-term reliability are paramount.

Specification Summary & Compliance

These thread cutting tapping screws feature precision 1/4-20 UNC coarse threads with standard Class 2A tolerances for consistent mating performance. The 1 1/2" length and 0.492" pan head diameter provide optimal clamping capability across various material thicknesses. Manufactured in compliance with ASME B18.6.3 and SAE J933 specifications, these fasteners ensure dimensional accuracy and mechanical performance consistency. The construction meets industry standards for material composition and plating thickness, providing reliable performance in commercial and industrial applications.