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Bore Gauges

Bore gauges are precision measuring instruments used to measure or transfer measurements of the interior diameter of holes, or bores, in a workpiece at any depth. Simple bore gauges are used with a caliper to transfer the hole measurement, while more complex gauges take… Learn More

Bore gauges have a two- or three-point contact, which indicates how many points on the gauge head touch the inside of the bore. Two-point contacts are better at measuring ovality, while three-point systems are used to measure lobing, or triangular form error. Pistol-grip bore gauges are used for fast, single-handed operation with good repeatability from one operator to another. Bore gauges, regardless of type, can be used in some special applications, such as measuring threads, spline pitch diameters, and deep bores.

Bore gauges are commonly made of steel, but their contact points may be made of carbide for additional hardness and to help extend tool life. When selecting the appropriate bore gauge for an application, consider the material type, system of measurement, and maximum measurement.

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