tap drill size for acme taps.

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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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