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Guide to Understanding Tolerances
Guide to Understanding Tolerances

This guide explains the different tolerances that can be found on engineering drawings.

Updated over 4 months ago

The tolerances provided on the Geomiq platform represent the tightest tolerance available on the engineering drawing.

For precision parts, it is crucial that the drawing always specifies a tolerance. If a tolerance is not explicitly provided, for standard parts, suppliers can default to a tolerance of Β±0.127mm, as indicated on the platform.

Tolerances related to Geometric Dimensioning and Tolerancing (GD&T) features, such as flatness, parallelism, perpendicularity, and concentricity, are specified in the engineering drawing. If these are not mentioned, suppliers can follow the tolerances outlined by ISO 2768 for general dimensional and geometrical requirements.

General Tolerances on Straightness & Flatness

General Tolerances on Perpendicularity

General Tolerances on Symmetry

General Tolerances on Circular Run-Out

Note - If nothing has been specified please use class β€œK”.

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