Inside Micrometers

What is an inside micrometer?

An inside micrometer is a precision measuring instrument used to measure internal dimensions, such as the diameter of holes or the width of slots.

How does an inside micrometer work?

It uses a calibrated screw mechanism. By rotating the thimble, the spindle extends or retracts, allowing it to be positioned against the internal surfaces being measured. The measurement is then read from the sleeve and thimble markings.

What are the different types of inside micrometers?

Common types include solid-handle inside micrometers, interchangeable-rod inside micrometers (for varying lengths), and tube inside micrometers (for measuring bores of pipes).

What is the accuracy of an inside micrometer?

The accuracy typically ranges from 0.0001 inches (0.0025 mm) to 0.001 inches (0.025 mm), depending on the size and quality of the instrument.

How do you properly use and maintain an inside micrometer?

Ensure the micrometer is clean and free of debris. Gently expand the jaws or rods to fit the internal dimension, avoiding overtightening. After use, clean and store it in its case to protect it from damage and dirt.