General Tolerance Iso 2768-mk Link -

Represents the K class under ISO 2768 Part 2. It defines the allowable variations for geometric features, specifically straightness, flatness, perpendicularity, symmetry, and run-out. ISO 2768 Part 1: Linear and Angular Tolerances (Class "m")

| Nominal Length Range (mm) | Class f (Fine) | Class m (Medium) | Class c (Coarse) | Class v (Very Coarse) | | :--- | :---: | :---: | :---: | :---: | | | ±0.05 | ±0.10 | ±0.20 | — | | 3 up to 6 | ±0.05 | ±0.10 | ±0.30 | ±0.50 | | 6 up to 30 | ±0.10 | ±0.20 | ±0.50 | ±1.00 | | 30 up to 120 | ±0.15 | ±0.30 | ±0.80 | ±1.50 | | 120 up to 400 | ±0.20 | ±0.50 | ±1.20 | ±2.50 | | 400 up to 1000 | ±0.30 | ±0.80 | ±2.00 | ±4.00 | | 1000 up to 2000 | ±0.50 | ±1.20 | ±3.00 | ±6.00 | | 2000 up to 4000 | — | ±2.00 | ±4.00 | ±8.00 |

The 'm' (medium) class in ISO 2768-1 is the most commonly used default for a wide range of machined and sheet metal parts. It offers a practical balance between achievable precision and manufacturing cost. The permissible deviations are determined by the nominal size of the feature, as shown in the table below.

Specifies "Medium" tolerances for geometrical features (such as straightness, flatness, perpendicularity, and symmetry). general tolerance iso 2768-mk

ISO 2768-mK acts as the baseline language of the modern machine shop. By using the medium linear tolerance (m) and medium geometric tolerance (K), engineers ensure their parts are highly functional, cost-effective to make, and easy to inspect.

The suffix "" combines two distinct parts of the ISO 2768 standard:

Understanding ISO 2768-mK: The Standard for General Tolerances in Machining Represents the K class under ISO 2768 Part 2

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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:

What are you using? (CNC machining, sheet metal, injection molding?) What is the primary material of the part? Share public link It offers a practical balance between achievable precision

Choosing the right class is a balancing act. While an "m" classification often provides a safe, cost-effective default, critical features still demand their own specific tolerances. By mastering the rules and tables outlined in this guide, you can harness the full potential of the ISO 2768 standard to streamline your designs, control manufacturing costs, and ensure consistent quality on every part you produce.

| Nominal Size Range (mm) | Tolerance (± mm) | | :--- | :--- | | 0.5 up to 3 | ± 0.1 | | Over 3 up to 6 | ± 0.1 | | Over 6 up to 30 | ± 0.2 | | Over 30 up to 120 | ± 0.3 | | Over 120 up to 400 | ± 0.5 | | Over 400 up to 1000 | ± 0.8 | | Over 1000 up to 2000 | ± 1.2 | | Over 2000 up to 4000 | ± 2.0 |