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Dimensional Tolerances
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Surface Properties,Tolerances and F.A.Q.
Dimensional Tolerances
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Injection-moulded parts are given a small taper on the sides and in bores, to ease ejection of the part from the mould. Ceramic parts warp a little during firing.

As-fired ceramic parts have a tolerance of +/- 2% of the dimension or +/- 0.2 mm, which ever is greater. Closer tolerances are achieved by grinding and lapping. The table below indicates the tolerances that we can offer. Grinding has to be done by diamond tools and is a costly operation.
Measurement As fired Ground High Precision Ground
0-10 mm +/- 0.2 mm +/- 0.05 mm +/- 2 microns
10-50 mm +/- 2% +/- 0.05 mm +/- 2 microns
50 mm +/- 2% +/- 0.10 mm +/- 4 microns
Ovality 2% of diameter 0.1% of diameter 2 microns
Straightness 2% of length 0.1% of length 0.01% of length
Parallelism 1% of length 0.1 mm 2 microns