Understanding micrometer screw gauge

When listing precision measuring instruments, for sure, a micrometer screw gauge must be among. It is one of the older precision measuring tools capable of measuring smaller dimensions vernier calipers cannot measure.  Today you’ll get to know the definition, history, function, parts, diagram, working of micrometer screw gauge.

Modern micrometer screw guageWhat is a micrometer screw gauge?

A micrometer screw gauge is a device widely used in the mechanical engineering field for measuring extremely small dimensions. Though it belongs to the family of calipers, and also consists of two different scales.

The hand tools are used in telescopes or microscopes to measure the potential diameter of microscopic objects.
Micrometers are not always in the form of calipers, but their spindle is very accurately machined screw. The part to be measure will be placed between the spindle and the anvil. This spindle moves toward the object to be measured when the ratchet knob is turned and the object is lightly toughed against the anvil.

Read more: Understanding Vernier Caliper


In the 17th century, William Gascoigne invented the first micrometric screw as an improvement of the vernier. it was used in a telescope to measure angular distances between stars and the relative sizes of celestial objects.

A micrometer is a neoclassical coinage word from greek, micros meaning ‘small’ and metron meaning ‘measure’. It has been micrometer Merriam-Webster that English got it from French.

In the early 19th century, Henry Maudslay developed a bench micrometer. He was given jocularly nicknamed “the Lord Chancellor” among his staff because of the micrometer final judge on measurement accuracy and micrometer in the firm’s work. In 1844, details of Whit worth includes published.

Read more: Understanding lathe machine


diagram Parts of micrometer screw gauge

The followings stated below are the main parts of a micrometer screw gauge, which include,

  • Frame
  • Anvil
  • Spindle
  • Sleeve
  • Thimble
  • Ratchet
  • Screw
  • Lock

Working a micrometer screw gauge

In a micrometer screw gauge, there are two gauge readings is taken, the first is the main scale reading followed by the circular scale reading. The instrument has two adjustment keys, one is for moving the spindle toward the anvil. The other key serves as a lock when the gauge is achieved.

Read more: Common types of precision measuring instruments

Watch the video below to learn the working of micrometer gauge:

Read more: List of Benchwork hand tools and their uses

That is all for this article, where the definition, parts, history, diagram, and working of a micrometer screw gauge are being discussed. I hope you get a lot from the reading, if so, kindly share with other students. Thanks for reading, see you next time!

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