Irwin Hanson 8149 9/16"-18 NF Fractional Plug Tap

The Irwin Hanson 8149 is a 9/16"-18 NF (National Fine) fractional plug tap designed for general-purpose hand threading applications. Constructed from high carbon steel, this tap is built for reliable performance in routine maintenance, repair, and re-threading tasks where precision thread accuracy is not critical.

Key Features:

• High carbon steel construction ideal for hand tapping applications
• Produces Class 2B threads for standard bolt and fastener applications
• Precision ground straight flutes provide rapid chip removal for efficient threading
• 3 to 5 threads chamfered for easier starting and smoother operation
• Tap size and recommended drill bit size etched on tool for easy identification
• Plug style tap suitable for through-hole and most blind-hole applications
• Made in USA with Hanson quality standards

This plug tap is the most versatile of the three tap styles, offering a balance between starting ease and threading depth. It's ideal for general-purpose threading work, tough threading applications, routine maintenance, and repair jobs. The straight flute design efficiently clears chips during the threading process, reducing binding and improving thread quality.