S-90390A118 1/4"-20 x 6" Tapping Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with black-phosphate steel coating for extended service life in demanding industrial environments
• Enhanced torque transmission through T30 Torx drive design, reducing cam-out risks and tool wear during installation
• Optimized material penetration with thread cutting (Type F) design that creates precise mating threads in aluminum, brass, cast iron and sheet metal
• Secure flush mounting with standard 82° flat head profile that sits perfectly countersunk in prepared holes
• Reduced assembly time through partial threading that combines quick starting with maximum thread engagement length
• Reliable fastening performance with UNC coarse threads providing superior holding power in various base materials
• Precision installation guidance with specified No. 1 drill bit (0.228") size ensuring proper hole preparation

Professional Applications & Engineering Value

These 1/4"-20 thread cutting screws deliver exceptional engineering value for industrial assembly applications requiring durable fastening solutions. The black-phosphate steel construction provides essential corrosion protection while the Type F thread cutting design eliminates the need for pre-tapped holes, significantly reducing installation time and labor costs. The T30 Torx drive system ensures maximum torque transfer without slippage, making these tapping screws ideal for high-volume production environments working with aluminum, brass, cast iron, and sheet metal components. The partial threading configuration offers the perfect balance between quick starting and maximum thread engagement, while the 82° countersink angle ensures flush mounting for aesthetic and safety requirements.

Specification Summary & Compliance

These industrial fasteners feature 1/4"-20 UNC coarse threads with right-hand direction and partial threading extending to minimum 4" length. Manufactured to precise dimensional standards with standard flat head profile and blunt tip design for controlled penetration. The screws are engineered for use with No. 1 drill bit (0.228" diameter) and feature 82° countersink angle for proper seating. Compliant with industry standards for thread cutting tapping screws (Type F) and suitable for various industrial applications requiring reliable fastening performance.