Iso 2768-mk Pdf ~upd~ «UPDATED Tutorial»

| Part of Standard | Symbol | Meaning | Applies To | | :--- | :--- | :--- | :--- | | | m | Medium class | Linear dimensions (lengths, widths, depths) Angular dimensions Radii & chamfers | | ISO 2768-2 | k | K class (general tolerance for geometric features) | Straightness, flatness, perpendicularity, symmetry, runout | Common Confusion: Many engineers mistakenly think "mk" refers only to a machining finish. In reality, m governs size, while k governs shape and position. ISO 2768-1: Tolerances for Linear & Angular Dimensions (Class "m") When a drawing specifies class m (medium) , the following permissible deviations apply:

| Nominal Length of Shorter Side (mm) | Tolerance (degrees/minutes) | | :--- | :--- | | Up to 10 | ±1° | | >10 up to 50 | ±0°30' | | >50 up to 120 | ±0°20' | | >120 up to 400 | ±0°10' | | >400 | ±0°5' |

What is ISO 2768? ISO 2768 is an international standard created for general tolerances . It applies to linear dimensions, angular dimensions, radii, chamfers, and flatness/straightness that are not individually tolerance-indicated on a technical drawing.

| Tolerance Class | Straightness & Flatness (mm per 100mm) | Perpendicularity (mm per 100mm) | Symmetry (mm per 100mm) | | :--- | :--- | :--- | :--- | | | 0.2 | 0.3 | 0.5 |