S-91715A166 1/4"-20 x 1" 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 demanding industrial environments
• Excellent thread cutting performance through Type F design that creates precise mating threads in aluminum, brass, cast iron, and sheet metal
• Optimized drive efficiency with Phillips No. 3 drive that provides secure tool engagement and reduces cam-out during installation
• Reliable fastening in various materials thanks to UNC coarse threading that ensures strong holding power and resistance to vibration loosening
• Full-length threading capability allowing complete penetration and maximum thread engagement for superior pull-out strength
• Industry-standard compliance meeting ASME B18.6.3 and SAE J933 specifications for consistent quality and performance
• Environmental regulation adherence with RoHS 3 compliance ensuring safe use in regulated applications

Professional Applications & Engineering Value

These 1/4-20 UNC thread cutting tapping screws deliver exceptional engineering value by solving critical fastening challenges in metal fabrication and assembly operations. The black zinc-plated steel construction provides enhanced corrosion protection while maintaining the necessary hardness for effective thread cutting in aluminum, brass, cast iron, and sheet metal applications. The Type F tapping screw design with coarse UNC threading eliminates the need for pre-tapped holes, significantly reducing installation time and labor costs in high-volume production environments. The fully threaded configuration ensures maximum thread engagement along the entire fastener length, providing superior resistance to vibration and pull-out forces in demanding industrial settings. These ASME B18.6.3 compliant fasteners are engineered to maintain dimensional consistency and mechanical properties batch after batch, making them ideal for automotive, machinery, and metal structure applications where reliability and performance cannot be compromised.

Specification Summary & Compliance

These precision-engineered thread cutting screws feature 1/4"-20 UNC coarse threads with Class 2A tolerance for consistent fit and performance. The manufacturing process strictly adheres to ASME B18.6.3 specifications SAE J933, ensuring dimensional accuracy and mechanical properties meet industrial standards. The black zinc-plated surface treatment provides corrosion protection while maintaining the screw's cutting efficiency. Regulatory compliance includes RoHS 3 (2015/863/EU) requirements, making these fasteners suitable for use in environmentally conscious manufacturing operations. The combination of precise thread form, proper heat treatment, and controlled plating thickness ensures reliable performance in the specified drill size of No. 1 (0.228" diameter) for optimal thread engagement.