(anonymous)
About This Document
This reference sheet summarises the general tolerance standard applied to all CNC Machining orders placed through Shapeways. Where no tolerance is specified on a technical drawing, parts are manufactured to DIN ISO 2768-mK (medium class linear dimensions, class K geometric tolerances). For tighter or specific tolerances, attach a technical drawing with the required tolerances clearly called out — Shapeways will confirm feasibility and pricing before production.
| Shapeways standard | DIN ISO 2768 | Medium class linear · Class K geometric |
|---|
Linear Dimensions — DIN ISO 2768 T1 (permissible deviations in mm)
Highlighted column (green) = Shapeways default class. All values are ± mm.
| Nominal dimension(mm) | f(fine) | m(medium) | c(coarse) |
|---|---|---|---|
| 0.5 up to 3 | ±0.05 | ±0.1 | ±0.2 |
| over3upto6 | ±0.05 | ±0.1 | ±0.3 |
| over6upto30 | ±0.1 | ±0.2 | ±0.5 |
| over30upto120 | ±0.15 | ±0.3 | ±0.8 |
| over120upto400 | ±0.2 | ±0.5 | ±1.2 |
| over400upto1000 | ±0.3 | ±0.8 | ±2.0 |
$$ \ { t{G G((G e r E E)}}) $$
$$ \pm,0.1 $$
$$ \pm,0.2 $$
$$ \pm,0.05 $$
$$ \pm,0.1 $$
$$ \pm,0.3 $$
$$ \pm,0.1 $$
$$ \pm,0.2 $$
$$ \pm,0.5 $$
$$ \pm0.3 $$
$$ \pm,0.15 $$
$$ \pm;0.2 $$
$$ \pm\ .55 $$
$$ \pm,1.2 $$
$$ \pm,0.3 $$
$$ \pm,0.8 $$
$$ \pm,2.0 $$
Angular Dimensions — DIN ISO 2768 T1
| Nominal length(mm) | f(fine) | m(medium) | c(coarse) |
|---|---|---|---|
| up to 10 | $\pm1^{\circ}$ | $\pm1^{\circ}$ | $\pm1^{\circ}30'$ |
| over10 up to50 | $\pm0^{\circ}30'$ | $\pm0^{\circ}30'$ | $\pm1^{\circ}$ |
| over50 up to120 | $\pm0^{\circ}20'$ | $\pm0^{\circ}20'$ | $\pm0^{\circ}30'$ |
| over120 up to400 | $\pm0^{\circ}10'$ | $\pm0^{\circ}10'$ | $\pm0^{\circ}15'$ |
| over400 | $\pm0^{\circ}5'$ | $\pm0^{\circ}5'$ | $\pm0^{\circ}10'$ |
$$ \pm,1^{\circ} $$
$$ \pm,1^{\circ} $$
$$ \pm,1^{\circ},30^{\circ} $$
$$ \pm,0^{\circ},30^{\prime} $$
$$ \pm0^{\circ}30^{\circ} $$
$$ \pm1^{\circ} $$
$$ \pm,0^{\circ},20^{\prime} $$
$$ \pm,0^{\circ},20^{\circ} $$
$$ \pm,0^{\circ},30^{\prime} $$
$$ \pm,0^{\circ},10^{\circ} $$
$$ \pm,0^{\circ},10^{\circ} $$
$$ \pm,0^{\circ},15^{\prime} $$
$$ \pm,0^{\circ},5^{\prime} $$
$$ \pm,0^{\circ},5^{\circ} $$
$$ \pm,0^{\circ},10^{\prime} $$
Geometric Tolerances — DIN ISO 2768 T2 (class K)
Shapeways applies class K for geometric tolerances (straightness, flatness, perpendicularity, symmetry, and run-out). Values below are for class K.
| Feature | Nominal range(mm) | ClassK tolerance(mm) |
|---|---|---|
| Straightness&Flatness | up to10 | 0.05 |
| over 10 up to 30 | 0.1 | |
| over 30 up to 100 | 0.2 | |
| over 100 up to 300 | 0.4 | |
| over 300 up to 1000 | 0.6 | |
| Perpendicularity | up to 100 | 0.4 |
| over 100 up to 300 | 0.6 | |
| Symmetry | up to 100 | 0.6 |
| over 100 up to 300 | 0.8 | |
| Circular run-out | all ranges | 0.2 |
How to Specify Tolerances
| Situation | What to do |
|---|---|
| No specific tolerance required | No action needed—DIN ISO 2768-mK applies automatically |
| Tight tolerance on specific features | Attach a PDF technical drawing. Call out the required tolerance on each critical dimension using standard GD&T; notation |
| Fit class required(e.g.H7/h6) | Specify the ISO fit class on your technical drawing for the relevant bore or shaft feature |
| Custom surface finish(Ra) | Note the required Ra value and the surfaces it applies to in your order notes |
| Unsure what tolerance you need | Contact sales@shapeways.com—we will help you define the right specification |
m (medium) class linear dimensions and K class geometric tolerances are the Shapeways default for CNC Machining. Green values throughout this document indicate the Shapeways standard. Surface finish standards vary by material — refer to the individual material page for Ra specifications. All tolerance values are based on DIN ISO 2768. This document is prepared by Shapeways and does not reproduce the standard in full.