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Iso 2768-mh Tolerance Chart ((top))
By writing "ISO 2768-mh" in the title block of a drawing, you automatically apply medium tolerances to standard lengths and tight geometric tolerances to the form of the part, eliminating the need to dimension every single feature manually. ISO 2768-mh Tolerance Charts
Engineers do not have to write individual tolerances for standard, non-critical part features.
To implement, denote "ISO 2768-mH" in the drawing's title block to apply these standards to all features lacking individual tolerance indications. Individual dimensioning is still required for critical features, which overrides the general standard. Why Use ISO 2768-mH? ISO 2768-mH offers several advantages in manufacturing:
| 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 |
Because ISO is a globally recognized standard, a drawing created in the United States or Europe can be sent to a machine shop anywhere in the world and interpreted exactly the same way. When Not to Use ISO 2768-mh iso 2768-mh tolerance chart
The following table provides an overview of the ISO 2768-MH tolerance chart:
ISO 2768-mH standard defines general tolerances for parts where specific tolerances aren't individually marked on a drawing. The designation refers to medium dimensional tolerances (Part 1), while refers to high-precision geometrical tolerances (Part 2). Part 1: Dimensional Tolerances (m - Medium)
If a specific feature requires tighter constraints than what the chart offers (e.g., a press-fit bearing bore), simply add an explicit tolerance (like 20mm ±0.01 ) directly to that dimension. The custom value overrides the general ISO standard for that feature alone.
ISO 2768-mH
Geometrical tolerances restrict the form variation of a surface or line over its total length. Nominal Length Range (mm) General Tolerance (Class H) Over 10 to 30 Over 30 to 100 Over 100 to 300 Over 300 to 1000 Over 1000 to 3000 5. Perpendicularity (ISO 2768-2, Class H)
The "h" class defines the permissible deviations for the shape and orientation of a part, such as how flat a surface must be or how perpendicular two edges are .
Angular tolerances for untoleranced dimensions are not absolute degrees. They depend on the length of the legs. A short 5mm chamfer at 45° can deviate by 1°, while a long 200mm angled brace can only deviate by 0°5'.
Ensures consistent quality across different suppliers. 6. Conclusion By writing "ISO 2768-mh" in the title block
This chart applies to standard linear dimensions such as internal sizes, external sizes, steps, diameters, and distances. Nominal Size Range (mm) Tolerance Limits (mm) Over 3 to 6 Over 6 to 30 Over 30 to 120 Over 120 to 400 Over 400 to 1000 Over 1000 to 2000 Over 2000 to 4000 2. External Radii and Chamfers (Class m - Medium)
It ensures consistency across different suppliers, machines, and manufacturing floors globally.
Refers to ISO 2768-2 , covering geometric features like straightness, flatness, perpendicularity, and symmetry. Dimensional Tolerance Chart (ISO 2768-m)
