Better: Iso 2768 General Tolerances Pdf

What is ISO 2768?

ISO 2768 (full title: ISO 2768: General Tolerances) is an international standard that specifies general tolerances for linear and angular dimensions without individual tolerance indications on technical drawings.

It applies when a designer does not write a specific tolerance next to a dimension. Instead, the drawing notes "ISO 2768" or "General tolerances ISO 2768-mK" (or similar) in the title block.

Part 1: ISO 2768-1 (Linear & Angular Dimensions)

This section applies to:

Linear dimensions (e.g., lengths, widths, heights, diameters, radii).
Angular dimensions (e.g., angles in degrees).
Chamfer heights and broken edges.

The Four Tolerance Classes: ISO 2768-1 defines four classes of tolerances. As you move from "f" to "v," the tolerance becomes looser (more deviation allowed).

The Tolerance Table (Linear Dimensions - up to 3000 mm):

| Nominal Size Range (mm) | f (Fine) | m (Medium) | c (Coarse) | v (Very Coarse) | | :--- | :--- | :--- | :--- | :--- | | 0.5 up to 3 | ±0.05 | ±0.1 | ±0.2 | — | | >3 up to 6 | ±0.05 | ±0.1 | ±0.3 | ±0.5 | | >6 up to 30 | ±0.1 | ±0.2 | ±0.5 | ±1.0 | | >30 up to 120 | ±0.15 | ±0.3 | ±0.8 | ±1.5 | | >120 up to 400 | ±0.2 | ±0.5 | ±1.2 | ±2.5 | | >400 up to 1000 | ±0.3 | ±0.8 | ±2.0 | ±4.0 | | >1000 up to 2000 | ±0.5 | ±1.2 | ±3.0 | ±6.0 | | >2000 up to 3000 | — | ±2.0 | ±4.0 | ±8.0 | What is ISO 2768

(Note: Angular dimensions have their own table, typically ±0.5° for class m up to 120mm length).

Table 2: Permissible Deviations for Angular Dimensions

Angular tolerances apply to angles expressed in degrees, minutes, and seconds. The tolerance depends on the length of the shorter side of the angle. Linear dimensions (e

| Length of Shorter Side | Class f / m | Class c / v | | :--- | :--- | :--- | | Up to 10 | ±1° | ±1°30' | | Over 10 up to 50 | ±0°30' | ±1° | | Over 50 up to 120 | ±0°20' | ±0°30' | | Over 120 up to 400 | ±0°10' | ±0°20' | | Over 400 | ±0°5' | ±0°10' |

The Four Classes (From Finest to Coarsest)