It is a device to measure dimensions of an object. It’s also known as micrometer screw gauge. Main types are outside, inside and depth micrometers. Outside micrometers are used to measure diameter & thickness of shafts, wires, plates. Inside micrometers are used to measure diameter of holes. Depth micrometers are used to measure the depths of holes, slots, shoulders. Measurement accuracy of micrometers is in the range +/- 0.00005 inch to +/- 0.001 inch.

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Detailed Description for Micrometer

A micrometer is a precision measuring instrument, used to obtain very fine measurements and available in metric and imperial versions. They are widely used in mechanical engineering for precisely measuring components. Micrometers have two scales: a primary scale, on the barrel or sleeve, and a secondary scale, on the thimble. Values are taken from each of these scales and combined to make the total measurement. 


Types of Micrometer

Basic types

Outside micrometer


 The outside micrometer is the most commonly used type of micrometer. It is used to measure external dimensions such as the outside diameter of an object.




Application: - Used to measure wires, spheres, shafts and blocks.


Inside micrometer


Inside micrometers are used to measure inside dimensions like the inside diameter of a hole or tube. There are two types of inside micrometer: caliper-type inside micrometers and tubular and rod inside micrometers.






Depth Micrometer


Depth micrometers are used to measure the depths of holes, slots and steps. They come with a variety of interchangeable rods of different lengths so that they can be used to measure a range of depths. 





Working of Micrometer


The micrometer is a precision measuring instrument, used by engineers. Each revolution of the rachet moves the spindle face 0.5mm towards the anvil face. The object to be measured is placed between the anvil face and the spindle face. The rachet is turned clockwise until the object is ‘trapped’ between these two surfaces and the rachet makes a ‘clicking’ noise. This means that the rachet cannot be tightened anymore and the measurement can be read.




Using the first example seen below:

1. Read the scale on the sleeve. The example clearly shows12 mm divisions.

2. Still reading the scale on the sleeve, a further ½ mm (0.5) measurement can be seen on the bottom half of the scale. The measurement now reads 12.5mm.

3. Finally, the thimble scale shows 16 full divisions (these are hundredths of a mm).

The final measurement is 12.5mm + 0.16mm = 12.66






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