Tolerance Calculator
What tolerance can your feature realistically hold? Combine nominal dimension, feature type, material shrink class and tolerance grade. Values follow the same engineering basis as our tolerances guide and map indicatively to ISO 20457 / DIN 16742 tolerance groups.
How to use the result
Tolerance capability widens with dimension, across parting lines, and with high-shrinkage materials — the three multipliers in this tool. If the result misses your requirement, the usual levers in order of cost are: move the feature into one mould half, switch to a low-shrink material, tighten the tolerance grade, or redesign the feature. For micro-scale parts the rules tighten further — see the micro moulding guide.
Values are typical achievable figures for a well-maintained steel tool under stable process conditions, interpolated from the reference table in our tolerances guide. They are planning values, not inspection commitments — final capability is confirmed per feature in the DFM review and at first-article inspection. ISO 20457 group mapping is indicative.
Need a feature-by-feature tolerance review? Send Nordmould your drawings — the free DFM review flags every feature that needs tighter control before tooling.