USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 3/TASK 1
tap drills.
Sixty degree angles in the shape of the gage are used for
checking Unified and American threads as well as for older American National
or U.S. standard threads, and for checking thread cutting tools.
FIGURE 198.
DRILL AND WIRE GAGES.
(2) Screw Pitch Gages.
Screw pitch gages (figure 199 on the
following page) are made for checking the pitch of U.S. Standard, Metric,
National form, V-form, and Whitworth cut threads. These gages are grouped
in a case or handle, as are the thickness gages. The number of threads per
inch is stamped on each blade. Some types are equipped with blade locks.
The triangular shaped gage has 51 blades covering a very wide range of
pitches, including 11 1/2 and 27 threads per inch for V-form threads.
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