U
ser
'
s
G
Uide
— 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 find the available
External Thread characteristics:
g b b
(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
UG4089E-A-inside.indd 35
6/9/2011 3:16:18 PM
