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Inside Micrometers & Bore Gauges

Inside micrometers and bore gauges are precision measuring instruments used to measure or transfer dimensions on a workpiece. Inside micrometers measure interior distances on a workpiece, such as the span between two edges, or the diameter of a circle or hole. Bore gauges… Learn More

A caliper-type inside micrometer has a pair of jaws that can be inserted into the space to be measured from interior edge to edge. Tubular and rod inside micrometers are placed within the space to be measured, and are extended to fill the remaining span and measure the interior wall to wall.

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.

Inside micrometers and bore gauges are commonly made of steel. A micrometer’s measuring face may have carbide tips for additional hardness and to help extend tool life. Similarly, the contact points of a bore gauge may be made of carbide.

When selecting the appropriate inside micrometer or bore gauge for an application, consider the material type, system of measurement, and maximum measurement.

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