Irwin Hanson 80230 NC Tap and Drill Bit Combo Set - 1/4-20 13/64

The Irwin Hanson 80230 is a convenient tap and drill bit combination set designed for creating 1/4"-20 NC (National Coarse) threaded holes. This two-piece set includes a high-speed steel drill bit and a high carbon steel plug tap, providing everything needed for precise threading operations in one package.

Key Features:

• High-speed steel 13/64" drill bit ensures fast, accurate pilot hole drilling
• High carbon steel plug tap ideal for general purpose 1/4"-20 threading applications
• First 3 to 5 threads chamfered for easy starting and smooth thread engagement
• Tap size and drill size clearly etched on each tool for quick identification
• Designed for hand threading work in a variety of materials including steel, aluminum, and plastic

This combo set eliminates guesswork by pairing the correct drill bit size with the corresponding tap, making it perfect for maintenance, repair, and fabrication projects. The plug tap design is suitable for through-holes and blind holes with sufficient depth, while the high-speed steel drill bit provides clean, precise pilot holes for optimal thread quality.