Bore Gauge (Gage)

A bore gauge is a convenient term for the measuring or transfer tools that are used in the process of accurately measuring holes.


Transfer gauges

Telescopic gauges

Telescopic gauge set

These are a range of gauges that are used to measure a bore’s size, by transferring the internal dimension to a remote measuring tool. They are a direct equivalent of inside calipers and require the operator to develop the correct feel to obtain repeatable results.

The gauges are locked by twisting the knurled end of the handles, this action is performed to exert a small amount of friction on the telescopic portions of the gauge (the smaller diameter rods found at the T head of the gauge). Once gently locked to a size slightly larger than the bore, the gauges are inserted at an angle to the bore and slowly brought to align themselves radially, across the hole. This action compresses the two anvils where they remain locked at the bores dimension after being withdrawn.

The gauge is then removed and measured with the aid of a micrometer or caliper.

Small hole gauges

Small hole gauge set. Sizes from top to bottom:

3 to 5 mm (0.118 to 0.197 in)

5 to 7.5 mm (0.197 to 0.295 in)

7.5 to 10 mm (0.295 to 0.394 in)

10 to 13 mm (0.394 to 0.512 in)

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 bore. The gauge is then removed and measured with a caliper or micrometer.

Dial bore gauge

A dial or vernier bore gauge measures a bore directly. The gauge has three symmetrical anvils that protrude from the gauge body that are connected to the dial or micrometer mechanism. As the knob is rotated it moves the anvils in or out with respect to the measurements. The knob usually has a slipping mechanism to take the feel out of the device and increase reliability between measurements. The measurement given is the mean diameter of the three anvils, and is usually good to 0.001 mm (3.9×10−5 in).[1]




This information originally retrieved from
on Monday 1st August 2011 4:52 pm EDT
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