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Thread Milling vs. Tapping
HaasTooling.com
THREAD MILLS
1. TPI NPTF Tapered Internal Carbide Thread Mill   |   2. UNC Parallel Internal Carbide Thread Mill
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hread mills differ from taps, because they have a smaller 
diameter than the thread size produced. The thread mill 
cutter must be able to enter the drilled hole, and then 
interpolate the thread profile. Because offset adjustments 
can be used to compensate for tool wear – as long as the thread form is 
still good – thread mills typically produce more threaded holes per tool 
than taps.
It also can be very expensive to remove a broken tap from a workpiece, 
especially if that workpiece is large. Broken thread mills are easily 
removed, and often, a new thread mill can be used to finish threading 
the hole, saving the part from having to be scrapped.
Haas solid carbide thread mills allow threading of a range of hole sizes, in a 
wide range of materials, using the same thread mill.
These tools are titanium aluminum nitride (TiAlN) coated, solid carbide 
cutters with cylindrical shanks, and they feature a hole through the center 
of the tool to take advantage of through-tool coolant.
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