tap drill size for acme taps.
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only
link to Acme Tap page
tap drill size for acme taps
Based on a 100% of thread as per ANSI
to calculate tap drill size for acme taps.
the magic formula
step 1
1 Divided by TPI ( threads per inch)
step 2
subtract this amount from the OD.
for pitches 10 and greater always add .005" for the drill
size.
for pitches less than 10 TPI take the amount from step 1 and
multiply x.05 ( 5 %) and add this to the drill size.
This is for 95% to 100% threads.
eg 1/2-10
1/10 = .100 ( step 1 )
.500 ( the OD ) minus .100 ( from step 1) = .400 drill size.
since the pitch is 10 or greater add .005" so the drill
size is .405"
eg 3/4-6
1/6= .167"
.750 - .167 = .583" ( 100% )
.167 X .05 = .008" ( to obtain 5% )
.583 + .008 = .591" ( 95%)
thanks to Mack from Widell
• ACME Thread Designer Program
Type in the nominal size and threads per inch for your ACME thread
and get all the needed min and max diameters for your machine
drawing.
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