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At ProMAXX Tool, our ProTaps are all machine-grade bottoming taps. We are able to provide this right off the start of tapping because the ProMAXX ProKits allow for the guide bushing to keep perfect alignment of the tap during the entire repair.
ProTap 8mm X 125 Bottoming Tap have 1 to 2 tapered cutting edges before the full cutting force is engaged. Though this tap is extremely hard to start threads with, it is capable of cutting threads all of the way to the bottom of a blind hole. Bottoming taps are best used after a taper or plug tap has been used to cut the initial thread.