Irwin Hanson 1520 1/4-20 NC Fractional Bottom Tap High Carbon Steel

The Irwin Hanson 1520 is a high-quality 1/4"-20 NC (National Coarse) fractional bottom tap designed for hand tapping applications. Manufactured from high carbon steel, this tap is ideal for general-purpose threading work, routine maintenance, repair, and re-threading applications where high accuracy threads are not critical.

Key Features:

• High carbon steel construction optimized for hand tapping applications
• Bottom tap design with 1 to 1-1/2 threads chamfered for threading to the bottom of blind holes
• Precision ground straight flutes provide rapid chip removal for efficient threading
• Produces a Class 2B thread for reliable fastener compatibility
• Tap size and recommended drill bit size etched on tool for easy identification
• Made in USA for consistent quality and performance

This bottom tap style is specifically designed for applications where threads must extend to the bottom of a hole. The straight flute design ensures efficient chip evacuation while maintaining clean, accurate threads. Ideal for tough threading work in steel, aluminum, and other common materials found in maintenance and repair operations.