Dial bore gauges

Dial bore gauges are measuring instruments used for the accurate checking of internal diameters, ovality, and taper in cylindrical holes. Used in precision mechanics, CNC machining, and quality control, they allow the dimensional conformity of mechanical components and internal seats to be checked with a high level of accuracy.

A dial bore gauge is used to measure internal diameters by comparison. The instrument is first zero-set using setting rings, inside micrometers, or gauge blocks, and is then inserted into the hole to be checked. The analogue or digital indicator detects deviations from the nominal dimension, making it possible to quickly identify dimensional variations, ovality, or machining errors.

The operating principle of a dial bore gauge is based on self-centring contacts that maintain correct alignment inside the hole. By slightly rocking the instrument during measurement, the minimum point can be found, providing a reliable and repeatable reading of the internal diameter. This system makes the dial bore gauge particularly suitable for high-accuracy dimensional checks.

Precision dial bore gauges are used in mechanical workshops, metrology rooms, and production departments to check cylinders, bushings, bearing seats, bored holes, and machined components with tight tolerances. They are essential in testing and quality control processes where internal diameters need to be checked with high repeatability.

The range includes dial bore gauges with 0.01 mm dial indicators, digital dial bore gauges, models for small holes, and versions with rods or extensions for checking different depths. Dial bore gauges for blind holes allow measurements to be carried out even in hard-to-reach points, while L-shaped rod configurations are useful for particular applications or components with complex geometries.

To ensure correct measurements, it is important to use the dial bore gauge with proper initial setting and certified dimensional references. The use of setting rings or gauge blocks helps improve measurement reliability and traceability in quality control.