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A micrometer (sometimes called micrometer screw gauge) is a precision measuring instrument, used to obtain very fine measurements and available in metric and imperial versions. They use a calibrated screw or thread (found internally on the spindle) for precise measurement of components in mechanical engineering and machining as well as most mechanical trades. They usually come in the form of callipers e.g. opposing ends joined by a frame. Learn how to calibrate and use micrometers correctly in our comprehensive [micrometers guide](/web/content/discovery/ideas-and-advice/micrometers-guide).

### What are Micrometers are composed of?

Here is a list of different components that make up a typical multimeter:

- Frame - The C-shaped body that holds the anvil and barrel in constant relation to each other,
- Anvil - The shiny part that the spindle moves toward, and that the sample rests against,
- Sleeve/barrel/stock - The stationary round component with the linear scale on it, sometimes with vernier markings,
- Locknut / lock-ring / thimble lock - The knurled component (or lever) that tightens to hold the spindle stationary,
- Spindle - The shiny cylindrical component that the thimble causes to move toward the anvil,
- Thimble - The component that turns by using a person's thumb. Graduated markings,
- Ratchet stop - Device on the end of the handle that limits applied pressure by slipping at a calibrated torque,
- Screw.

### How do they work?

The precision is determined by the thread pitch of the spindle. The spindle is a very accurately machined screw and the object to be measured is placed between the spindle and the anvil. The spindle is moved by turning the ratchet knob or thimble until the object to be measured is lightly touched by both the spindle and the anvil.

### Types of Micrometers
- Outside micrometer: most common type used to measure external dimensions such as the outside diameter of an object.
- Inside micrometer; used to measure inside dimensions like the inside diameter of a hole or tube. There are two types: calliper-type and tubular and rod.
- Depth micrometer: these 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.

### Advantages
- Provide very accurate measurements and are considered one of the most accurate types of measuring device
- Ratchet speeder helps to provide reliable measurements
- Integrated scales, the sleeve scale and thimble scale are built into the tool, another measuring instrument such as a ruler or tape measure is not required
- Durability and long-lasting and unlikely to need replacing or repairing


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Micrometers | Micrometer Screw Gauge | RS

Micrometers

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Internal Micrometers | RS

<p>Looking for Internal micrometers then we are sure to have the ideal solution for you. Our extensive range is easy to browse with updated filters that help you find your ideal solution. Internal micrometers are also known as inside micrometers, they take precise measurements of the inner diameter of parts such as tubes and bearings.</p><h2>How does an Internal Micrometer work? </h2><p>It’s important to learn how to use micrometers correctly, especially analogue micrometers. Internal micrometers are designed with locking anvils, barrel scale, and a thimble scale. During operation insert the micrometer anvils into the object cavity and adjust the length by turning the thimble clockwise this separates the anvils until the opposing sides meet the inner diameter wall. To read the measurement combine the barrel scale and thimble scale. </p><p>A digital internal micrometer is easier to use, the operating principles are the same as analogue micrometer except the LCD unit reads the measure for you. </p><h2>Measuring scales</h2><p>The internal micrometer has the measuring scale labelled on the device, you take the readings from the barrel scale which has two measurement points; above and below the line. Above is mm and below is 0.5 mm. The thimble also has marking measured to the nearest 0.01mm. </p><h3>Measurement example</h3><ul><li>Barrel scale: 10 mm + thimble scale: 0.25 mm = Inner diameter measurement of 10.25 mm</li></ul><h2>Applications</h2><p>Internal micrometers are professional hand tools used by engineers in metalwork fabrication, test and measure applications, and quality control. </p><h2>Why would you choose RS for Internal Micrometers? </h2><p>We support technical engineers with quality Internal micrometers sourced from leading brands such as Mitutoyo, Starrett, and RS PRO. </p>

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Digital Micrometers | RS

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Starrett Micrometers | RS

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Mitutoyo Micrometers | RS

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Depth Micrometers | RS

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Metric Micrometers | RS

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Imperial Micrometers | RS

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External Micrometers | RS

<p>Looking for external micrometers then we have the solution for you. Our extensive range has an improved categorised filter to help you find your ideal solution. External micrometers are also known as outside micrometers, commonly used for precise measurements such as the outer diameter of component parts or materials.</p><h2>Also known as</h2><ul><li>Micrometer screw gauges</li><li>Outside micrometers</li></ul><h2>How does a micrometer work?</h2><p>Its important to learn how to use micrometers correctly, especially analogue micrometers. External micrometers are designed with an anvil, spindle, barrel scale, and a thimble scale. During operation clamp the object between the anvil and the spindle, turning the thimble moves the spindle closer to the object being measured, once the spindle touches combine the barrel scale and thimble scale for the measurement reading.</p><p>A digital micrometer is easier to use, the operating principles are the same as analogue micrometer except the LCD display reads the measure for you. </p><h2>Measuring scales</h2><p>The external micrometer has the measuring scale labelled or embossed on the device, you take the readings from the barrel scale which has two measurement points; above and below the line. Above is mm and below is 0.5 mm. The thimble also has marking measured to the nearest 0.01mm.</p><ul><li>Example reading: Barrel scale 12 mm + Thimble scale 0.35 mm = 12.35 mm</li></ul><h2>Applications</h2><p>External micrometers are used by engineers in workshops, metal fabrication, calibration testing, and quality control. </p>

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