NdFeB Magnet Tolerance and Critical Dimensions

Start with the critical-to-function dimensions

Overall length, width, diameter or thickness

Datum scheme and reference faces

Fit, clearance and assembly interfaces

Hole, bore, countersink or radius features

Flatness, concentricity or positional controls

Conditional tolerance language

Typical tolerance is stated as ±0.1 mm. A ±0.05 mm level may be considered when the drawing dimensions and production route support it. The exact tolerance basis is confirmed against the part, process and inspection method.

Connect dimensions to inspection

A useful inspection plan identifies which dimensions are measured, how they are referenced and what release standard applies. Vision measurement, CMM or other available checks can be aligned to the agreed drawing and project requirements.

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