The Irwin Hanson #8123 is a fractional, right-hand 1/4″-28 NF (National Fine) high carbon steel plug tap. It features a 3-to-5 thread chamfer and four precision-ground straight flutes designed for rapid chip removal during hand-threading operations
The Irwin Plug Tap Bit 1/4″-28NF (Model #8123) is a high-carbon steel, 4-flute hand tap designed to produce 2B class threads. It is ideal for routine maintenance, repairing stripped threads, and creating threads in through-holes where the threads do not need to reach the very bottom of the blind hole
