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User's Guide —
t
PITCH DIAMETER
MIN 4.435 MM
t
MAJOR DIAMETER
MAX 4.978 MM
t
MAJOR DIAMETER
MIN 4.888 MM
t
MINOR DIAMETER
MAX 4.166 MM
Custom Thread Percentage
The Machinist Calc Pro 2 uses a default Thread Grip
Percentage of 75% when calculating Tap Drill sizes. With the
custom Percentage Thread function, you can enter a different
value to calculate Tap Drill sizes.
Calculate the Tap Drill Size for a 0.25 Inch, 26 TPI screw, then
change the Thread Grip Percentage to 50% and calculate the
new Tap Drill Size:
g*
ALL CLEARED
0.
1.
Enter the Thread Size and calculate the Cut Tap and Roll Tap
Drill Sizes
:
.25it
THREAD SIZE
2B 0.25 - INCH
26t
THREAD SIZE
2B 0.25 - 26 INCH
t
THREAD PITCH
0.038 INCH
t
TAP DRILL SIZE
#3 0.213 INCH
t*
ROLL TAP DRILL
5.900 MM
(cont'd)
3844-UG4088E-E.indd 493844-UG4088E-E.indd 49 11/18/2022 6:50:13 AM11/18/2022 6:50:13 AM
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