An inside micrometer, also referred to as an internal micrometer, is a precision measuring instrument designed for accurately gauging the internal diameter of cylindrical holes, bores, and cavities. Comprising a main frame, a measuring head, and a measuring spindle, the inside micrometer operates by inserting its measuring head into the bore to be measured. As the measuring spindle is adjusted using a thimble or ratchet mechanism, the anvils make contact with the bore’s inner walls, allowing for a precise measurement of the internal diameter. These instruments are indispensable in various industries, including manufacturing, machining, and quality control, where ensuring the accurate dimensions of internal features is pivotal for proper fit, functionality, and overall product quality.
