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 Concept

# Tip Size

## Definition

The diameter of the file at its tip (D0), measured in hundredths of a millimeter. A size 25 file has a tip diameter of 0.25 mm. Tip size determines the minimum apical preparation diameter.

## Clinical Guides

[How to Read File Sizes](https://endo-guide.app/file-sizes)[Canal Preparation](https://endo-guide.app/canal-preparation)

## Related Terms

[Cyclic Fatigue](https://endo-guide.app/glossary/cyclic-fatigue)[Torsional Resistance](https://endo-guide.app/glossary/torsional-resistance)[Torque](https://endo-guide.app/glossary/torque)[Screw-In Effect (Taper Lock)](https://endo-guide.app/glossary/screw-in)[Glide Path](https://endo-guide.app/glossary/glide-path)[Working Length](https://endo-guide.app/glossary/working-length)

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