While Part 1 deals with "size" (how long or wide something is), Part 2 deals with "shape" (how flat, straight, or square something is).
Refers to Part 2 of the standard, covering geometrical characteristics such as straightness, flatness, and perpendicularity. ISO 2768-1: Linear & Angular (Class m) Tolerance Iso 2768 Mk Pdf
| Nominal Dimension (mm) | Tolerance (mm) | | :--- | :--- | | 0.5 up to 3 | $\pm 0.1$ | | Over 3 up to 6 | $\pm 0.1$ | | Over 6 up to 30 | $\pm 0.2$ | | Over 30 up to 120 | $\pm 0.3$ | | Over 120 up to 400 | $\pm 0.5$ | | Over 400 up to 1000 | $\pm 0.8$ | | Over 1000 up to 2000 | $\pm 1.2$ | | Over 2000 up to 4000 | $\pm 2.0$ | While Part 1 deals with "size" (how long
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