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- 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 holes1. It is used to measure parts such as valve guides, which have very small holes that are too small to use an inside micrometer or telescoping gauge1. Small-hole gauges require a slightly different technique to the telescopic gauges. The small hole gauge is initially set smaller than the bore to be measured. It is then inserted into the bore and adjusted by rotating the knurled knob at the base, until light pressure is felt when the gauge is slightly moved in the bore2.Learn more:✕This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.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.tresnainstrument.com/small_hole_gauge.htmlSmall-hole gauges require a slightly different technique to the telescopic gauges, the small hole gauge is initially set smaller than the bore to be measured. It is then inserted into the bore and adjusted by rotating the knurled knob at the base, until light pressure is felt when the gauge is slightly moved in the bore.en.wikipedia.org/wiki/Bore_gauge
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