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Tap hole size calculator
Units
Major Diameter
Pitch
Tap Type
% of Thread
To minimize tapping problems and lengthen tool life, use the largest drill possible to produce a minor diameter that will result in the lowest percentage of full thread consistent with adequate strength.
suggested percentage of full thread in tapped holes
material
deep holes
general purpose
short holes
free cutting
aluminum
brass
Bronze
cast iron
copper
mild steel
tool steel
60%-70%
70%-80%
75%-85%
hard or tough
cast steel
drop forging
monel metal
nickel steel
stainless steel
55%-65%
60%-70%

thread_form.jpg
thread_form.jpg
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