USE/CARE OF HANDTOOLS & MEASURING TOOLS - OD1621 - LESSON 3/TASK 1
CENTER AND SCREW PITCH THREAD GAGES.
e. Types of Small Hole and Telescoping Gages.
(1) Small Hole Gages. Small hole gages (figure 200 on the following
page) are adjustable, having a rounded measuring member. A knurled screw in
the end of the handle is turned to expand the ball-shaped end in small holes
A micrometer caliper is used to measure the ball end.
Maximum measuring capacity is 1/2 inch.
(2) Telescoping Gages.
Telescoping gages (figure 200) are used to
gage larger holes and to measure inside distances. These gages are equipped
with a plunger that can be locked in the measuring position by a knurled
screw in the end of the handle.
Maximum measuring capacity is 6 inches.
Measurements must be calipered on the gage by a micrometer, as in the case
of the small hole gages.