Micrometer

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A micrometer (pronounced /maɪˈkrɒmɨtər/, US dict: mī·krŏm′·ĭ·tər), sometimes known as a micrometer screw gauge, is a device incorporating a calibrated screw used widely for precise measurement of small distances in mechanical engineering and machining as well as most mechanical trades, along with other metrological instruments such as dial, vernier, and digital calipers. Micrometers are often, but not always, in the form of calipers.

Colloquially the word micrometer is often shortened to mike /ˈmaɪk/ (US dict: mīk′).

Contents

Types

Basic types

The topmost image shows the three most common types of micrometer; the names are based on their application:

  • Outside micrometer (aka micrometer caliper), typically used to measure wires, spheres, shafts and blocks.
  • Inside micrometer, used to measure the diameter of holes.
  • Depth micrometer, measures depths of slots and steps.

Specialized types

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