Inside Micrometers

Inside micrometers are measuring instruments designed to measure the internal diameter of a hole or the width of a cavity. Essential in fields like precision mechanics and industrial engineering, they ensure reliable and repeatable measurements, which are crucial for quality control and compliance with dimensional tolerances.

Unlike outside micrometers, inside micrometers do not have a frame or anvil. Instead, their structure consists of a coaxial cylinder and a sleeve for reading, with the measuring anvils extending radially from the instrument’s axis. The contact points on internal micrometers can have different shapes, such as flat cylinders, curved cylinders, or hemispheres, allowing for flexibility in meeting specific measurement requirements.

Due to their unique configuration, these micrometers typically have a smaller measurement range, making them ideal for applications requiring high accuracy on smaller dimensions.

Other types of micrometers include extendable rod models, which are used to measure large diameters. These consist of a micrometer head and a series of interchangeable rods of different lengths, which, when combined, extend the measurement range.