42 —
M
achinist
c
alc™
P
ro
external Thread
Thread Size
Minimum Pitch Diameter
Cut Rod Size
Maximum Major Diameter
Roll Shank Size
Minimum Major Diameter
Maximum Pitch Diameter
Maximum Minor Diameter
Thread Classification
With the
Machinist Calc Pro
you can choose between Internal
and External Threads. Entering a U.S. Thread Size will allow you
to choose among U.S. Thread Classes as shown below.
Thread Type
U.S. Thread Classes
Internal
1b
2b*
3b
external
1A
2A
3A
Entering a Metric Thread will allow you to choose among Metric
Thread Tolerance Classes as shown below.
Thread Type
Metric Thread Tolerance Classes
Internal
3G
3H
4G
4H
5G
5H
6G
6H*
7G
7H
8G
8H
9G
9H
external
3g
3h
3e
3f
4g
4h
4e
4f
5g
5h
5e
5f
6g
6h
6e
6f
7g
7h
7e
7f
8g
8h
8e
8f
9g
9h
9e
9f
* Default settings
Changing Thread Classes
To display the current Thread Classification, press
g b
.
Repeated presses of
b
will toggle between External and
Internal Thread Types. You can change the number of a
Thread Class by entering the number of the desired class/
grade and pressing
g b
.
(cont’d)