Us e r 's GU i d e — 35
4. Find the available Internal Thread characteristics:
t
(Cut Tap Drill Size)
TAP DRILL SIZE 4.25 MM
t
(Roll Tap Drill Size)
R-TAP DRILL SIZE 14
t
(Close Fit Drill Size)
CLOSE DRILL SIZE 5.3 MM
t
(Free Fit Drill Size)
FREE DRILL SIZE 5.8 MM
t
(Min. Internal Pitch Diameter)
PTCH- SIZE 4.5130 MM
t
(Max. Internal Pitch Diameter)
PTCH+ SIZE 4.5605 MM
t
(Min. Internal Minor Diameter)
MINR- SIZE 4.1880 MM
t
(Max. Internal Minor Diameter)
MINR+ SIZE 4.3060 MM
t
(Min. Internal Major Diameter)
MAJR- SIZE 5.0000 MM
5. Switch to External 4g Tolerance Class and nd the available
External Thread characteristics:
gbb
(Thread Class)
EXT MM 4G
t
THRED SIZE
$
5. – 0.75 MM
t
(Rod Size for Thread Cutting)
ROD SIZE 5.0000 MM
t
(Rod Size for Cold Forming)
CFORM SIZE 4.4520 MM
t
(Max. External Pitch Diameter)
PTCH+ SIZE 4.4910 MM
t
(Min. External Pitch Diameter)
PTCH- SIZE 4.4350 MM
t
(Max. External Major Diameter)
MAJR+ SIZE 4.9780 MM
t
(Min. External Major Diameter)
MAJR- SIZE 4.8880 MM
t
(Max. External Minor Diameter)
MINR+ SIZE 4.1660 MM
Custom Thread Percentage
The Machinist Calc Pro 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.
KEYSTROKE DISPLAY
(cont’d)
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