Irwin Hanson 1440 7/16"-20 NF Fractional Plug Tap High Carbon Steel

The Irwin Hanson 1440 is a high carbon steel plug tap designed for creating 7/16"-20 NF (National Fine) internal threads in a variety of materials. This fractional plug tap features precision ground straight flutes that provide rapid chip removal for efficient threading performance in hand tapping applications.

Key Features:

• 7/16"-20 NF thread specification produces a Class 2B thread
• High carbon steel construction ideal for hand tapping applications
• Precision ground straight flutes for efficient chip removal
• Plug style with 3 to 5 threads chamfered for general-purpose threading
• Tap size and recommended drill bit size etched on the tool for easy identification
• Made in USA with quality Hanson craftsmanship

The plug tap chamfer style is the most common and versatile option, making this tap ideal for all general-purpose threading work, routine maintenance, repair tasks, and re-threading applications where high accuracy threads are not critical. The straight flute design is optimized for hand threading work in through-holes and blind holes with sufficient depth.