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Everything you need to know on Micrometer screw gauge

When listing precision measuring instrument, for sure, micrometer screw gauge must be among. It is one of the older precision measuring tools capable of measuring smaller dimensions a vernier calliper cannot measure.

Modern micrometer screw guage

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 callipers, 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 callipers, 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.


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.

Micrometer is neoclassical coinage word from greek, micros meaning ‘small’ and metron meaning ‘measure’. It has been micrometre 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 micrometer final judge on measurement accuracy and micrometre in the firm’s work. In 1844, details of Whit worth includes published.


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

How to use a micrometer screw gauge

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

Watch the video below to see how micrometer gauge works

I hope you’ve found this post interesting and attained the knowledge. If so, you can freely give your point in our comment section and please share with other students. Thanks!

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