U
ser
'
s
G
Uide
— 51
t
(Roll Tap Drill Size)
R-TaP
DRIll sIZe
5.9
MM
t
(Close Fit Drill Size)
Close
DRIll sIZe
f
t
(Free Fit Drill Size)
fRee
DRIll sIZe
H
t
(Min. Internal Pitch Diameter)
PTCH-
sIZe
0.2268
InCH
t
(Max. Internal Pitch Diameter)
PTCH+
sIZe
0.2311
InCH
t
(Min. Internal Minor Diameter)
MInR-
sIZe
0.2110
InCH
t
(Max. Internal Minor Diameter)
MInR+
sIZe
0.2200
InCH
t
(Min. Internal Major Diameter)
MaJR-
sIZe
0.2500
InCH
5. Switch to Thread Class 2A and find the available External
Thread characteristics:
g b b
(Thread Class)
eXT 2a
t
THReD
sIZe
$
1/4 –
28
InCH
t
(Rod Size for Thread Cutting)
RoD
sIZe
0.2500
InCH
t
(Rod Size for Cold Forming)
CfoRM
sIZe
0.2239
InCH
t
(Max. External Pitch Diameter)
PTCH+
sIZe
0.2258
InCH
t
(Min. External Pitch Diameter)
PTCH-
sIZe
0.2225
InCH
t
(Max. External Major Diameter)
MaJR+
sIZe
0.2490
InCH
t
(Min. External Major Diameter)
MaJR-
sIZe
0.2425
InCH
t
(Max. External Minor Diameter)
MInR+
sIZe
0.2065
InCH
6. Return calculator to Metric Mode:
g S S S +
MeTRC UnITs
KeysTRoKe
DIsPlay
UG4089E-A-inside.indd 51
6/9/2011 3:16:19 PM
