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Small-Hole Gauges

A small-hole gauge is a measuring tool with a round expandable head that is used together with an outside micrometer to measure the inside of small holes. Parts , such as valve guides , have very small holes. These holes are too small to use an inside micrometer or telescoping gauge. Small-hole gauges are made in sets to cover different diameters of holes.
The small-hole gauge has a round head. The head diameter can be changed with a small wedge. The wedge slides up or down inside the head by turning the handle adjuster. Put the round head of the gauge into the hole to be measured. Turn the handle until the round head touches the sides of the small holes.

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