General Tolerance Iso 2768-mk

Applicable to external radii, chamfer heights, and linear sizes (lengths, widths, diameters).

Covers external radii and chamfer heights for deburred or rounded edges. 2. ISO 2768-2: Geometrical Tolerances (Class 'K')

The letters 'm' and 'k' are not arbitrary; they denote specific tolerance classes. general tolerance iso 2768-mk

If you are designing custom mechanical enclosures, structural brackets, or general machinery parts, assigning provides the ideal balance of precision and manufacturability for standard industrial processes.

Geometrical tolerances for features (like flatness, straightness, and symmetry). Applicable to external radii, chamfer heights, and linear

Straightness applies to lines or axes, while flatness applies to surfaces. The tolerance is determined by the length of the longest side or diameter of the surface: Nominal Length Range (mm) Straightness and Flatness Tolerance (mm) over 10 to 30 over 30 to 100 over 100 to 300 over 300 to 1000 over 1000 to 3000 Perpendicularity

To legally enforce this standard on your design, you must state it explicitly inside or near the drawing title block. The standard layout requires the ISO designation followed by the chosen tolerance classes. For example, your drawing note should read: ISO 2768-2: Geometrical Tolerances (Class 'K') The letters

If you have ever looked at a technical drawing and seen the note “General tolerances ISO 2768-mk” in the title block, you have likely asked yourself two questions:

By using "mk", a manufacturer instantly knows that the component requires standard, medium-precision machining. This is typically achievable via conventional milling, turning, and drilling operations without requiring expensive secondary finishing processes like grinding or honing. Part 1: Linear Dimensions (The "m" Class)

| Nominal Length Range | Tolerance (mm) | |----------------------|----------------| | ≤ 100 | 0.2 | | >100 – 300 | 0.3 | | >300 – 1000 | 0.4 | | >1000 – 3000 | 0.5 |

These tolerances apply to dimensions like length, width, and diameter when not specified. All values below are in . Nominal Range (mm) Tolerance (±) 120 to 400 400 to 1000 1000 to 2000 2000 to 4000 Additional "m" class values: