Mitutoyo Micrometer

A micrometer is a precision instrument that measures small external, internal or depth dimensions to micron-level accuracy. It works through a calibrated screw that converts spindle rotation into linear travel. Mitutoyo micrometers cover outside, inside, depth and specialised forms, in both analog and digital readout versions.

What is a micrometer?

Micrometers deliver finer resolution than vernier calipers for the same dimension. They suit machining, toolroom inspection and quality control where tight tolerances apply.

The screw mechanism converts thimble rotation into precise spindle movement. A locking clutch or ratchet applies repeatable measuring force for consistent readings.

Outside, inside, depth and bore micrometers

Mitutoyo offers several families. Outside micrometers measure external sizes. Inside micrometers measure bores and slots. Depth micrometers measure hole and step depths. Specialised forms include blade, tube, point and disc micrometers.

Types of Mitutoyo micrometers

The Mitutoyo micrometer range covers a wide span of measurement tasks. Outside micrometers are the most common type for measuring shafts, pins and flat surfaces. Inside micrometers extend into bores, slots and internal grooves. Depth micrometers use interchangeable rods to reach into stepped features and blind holes.

Digital vs analog micrometers

Digital models add a clear electronic display and data output for SPC workflows. An RS232 or USB output transfers readings directly to inspection software, reducing transcription errors. Analog models remain reliable where power and electronics are not preferred, and they require no batteries.

How to choose a micrometer

Select by measuring range, resolution and the feature type being measured. Match the spindle travel to the nominal dimension. Choose a digital model when data output is needed. Confirm exact models, ranges and resolutions from the live product listing below.

Calibration and care

Precision instruments require periodic calibration to maintain measurement traceability. Clean the anvil and spindle faces before each use. Store micrometers with a small gap between faces to prevent gauge block adhesion. Contact BTSA for calibration support.

Frequently asked questions

What does a micrometer measure?

A micrometer measures small linear dimensions such as thickness, diameter, depth and width with high accuracy.

Is a micrometer more accurate than a vernier caliper?

Yes. For the same dimension, a micrometer generally offers finer resolution and tighter accuracy.

What is the difference between a digital and an analog micrometer?

A digital micrometer shows readings on an electronic display and can output data. An analog micrometer uses a thimble and barrel scale read by the operator.