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Secondary III • 1yr.

What is dimensional tolerance and what is the ± (+/-) symbol in technical drawings?

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  • Explanation from Alloprof

    Explanation from Alloprof

    This Explanation was submitted by a member of the Alloprof team.

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    Team Alloprof • 1yr.

    Thanks for your question!

    Dimensional tolerance is a representation on a technical drawing of the maximum deviation between a specified measurement and an actual measurement on the built part.

    The dimensional tolerance is represented by the + / - (or ±) symbol placed between the actual measurement and the tolerance. Tolerance is the maximum degree of imprecision allowed on a part.

    For example, a measurement of 25 ± 5 mm would indicate that the actual measurement could be between 20 and 30 mm.

    Don't hesitate if you have other questions!