Three-point micrometers

Three-point micrometers are measuring instruments designed for the accurate checking of internal diameters in holes and cylindrical seats. Thanks to the three-point contact system, they provide reliable and repeatable measurements, making them particularly suitable for quality control, precision machining, and dimensional inspections where high accuracy is required.

Unlike traditional inside micrometers, the three-point micrometer uses three measuring contacts positioned radially at 120° from each other. This configuration allows self-centring inside the hole, improving measurement stability and reducing errors caused by misalignment during internal diameter inspection.

Three-point inside micrometers are used to check cylindrical holes, mechanical seats, and internal diameters with high repeatability. The uniform distribution of the contact points improves measurement sensitivity and makes this instrument particularly suitable for dimensional inspections in industrial and metrology applications.

The range includes analogue three-point micrometers, digital three-point micrometers, and complete sets for different measuring ranges. Digital versions provide immediate reading of the measured value, while analogue models remain highly appreciated in mechanical workshops for their reliability and operational simplicity.

Three-point micrometer sets are particularly useful when several internal diameters need to be covered with a single kit. Pistol-grip configurations instead make quick checks on series-produced parts easier, improving ergonomics and operating speed in quality control activities.

These instruments are often used for checking bored holes, bearing seats, turned components, and mechanical parts where internal diameter inspection requires high accuracy and excellent repeatability. The ratchet system also helps maintain constant measuring pressure, improving the consistency of results.

To choose the most suitable three-point micrometer, it is important to consider the required measuring range, the diameter of the hole to be checked, the frequency of use, and whether analogue or digital reading is preferred. The availability of both individual models and complete sets allows the instrument to be adapted to different production and metrology requirements.