: Flexible plastics or rubber components expand and contract due to temperature and humidity. They cannot reliably hold ISO 2768-mh limits and often require ISO 13920 or custom guidelines instead. Summary of the Standard Standard Segment Metric Scope Class Level Chosen Tightness Level ISO 2768-1 Linear & Angular Dimensions m Medium [1, 2] ISO 2768-2 Geometrical Tolerances H High / Tight [1, 4]
| 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' |
The ISO 2768-MH tolerance chart also provides guidelines for geometric tolerances, including: iso 2768-mh tolerance chart
If you specify , you are asking for Medium linear accuracy but Coarse geometric accuracy.
*Source: *
For nominal sizes below 0.5 mm, deviations must be indicated directly on the drawing adjacent to the relevant dimension .
Note: "H" stands for "precision" geometric tolerance class. : Flexible plastics or rubber components expand and
| Nominal dimension (°) | Tolerance (°) | | --- | --- | | 1-10 | ±0.5 | | 10-50 | ±1 | | 50-200 | ±2 |
For Class H, the total permissible circular run-out (radial and axial) is strictly limited to a maximum of . Why Use ISO 2768-mh in Manufacturing? *Source: * For nominal sizes below 0
The "MH" in ISO 2768-MH refers to the specific tolerance class, which is defined as "medium" tolerance. This class provides a balance between the precision required for a part or component and the practical limitations of manufacturing processes.