Iso 2768-mh Tolerance Chart ~upd~

Understanding the ISO 2768-mh Tolerance Chart: A Comprehensive Guide

is the perfect starting point for general machining – precise enough for most functional parts but loose enough to keep costs down.

You don't have to clutter your CAD exports with "±" values for every single fillet or shoulder.

✅ Example: A 50 mm width without a specific tolerance is allowed to be 50 mm ±0.3 mm. iso 2768-mh tolerance chart

6 — 30: ±0.2

| Nominal Dimension (mm) | Flatness & Straightness | Perpendicularity | Symmetry | | :--- | :--- | :--- | :--- | | | 0.2 | 0.4 | 0.6 | | Over 10 up to 30 | 0.3 | 0.6 | 1.0 | | Over 30 up to 100 | 0.4 | 0.8 | 1.5 | | Over 100 up to 300 | 0.6 | 1.0 | 2.0 |

❌ – H is for holes only. For shafts, use “mK” or specify individually. ❌ Assuming bilateral tolerances for holes – H holes are unilateral (+/0). ❌ Using mH for welded or cast parts – ISO 2768 is for metal removal (machining), not raw castings. ❌ Forgetting angular tolerances – 1 degree is large. If you need 0.5°, specify it. 6 — 30: ±0

| Nominal Dimension (mm) | Permissible Deviation (mm) | | :--- | :--- | | | ±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 |

Simplifies technical drawings by eliminating the need to define tolerances for every feature.

Because the second letter is "H", the part is subject to strict geometrical controls for features like Straightness, Flatness, Perpendicularity, and Symmetry. Nominal Length Range (mm) Geometric Tolerance (in mm) Up to Over Over Over Over Over ❌ Using mH for welded or cast parts

Using general tolerances ensures that parts aren't over-engineered with unnecessarily tight (and expensive) limits where they aren't needed .

In the world of engineering and manufacturing, tolerances play a crucial role in ensuring that parts and assemblies fit together properly. One of the most widely used tolerance standards is ISO 2768, which provides a set of general tolerances for linear and angular dimensions. In this blog post, we'll take a closer look at the ISO 2768-MH tolerance chart and its applications.

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Note: For dimensions smaller than 0.5mm, the deviation must be indicated specifically.

Have questions about applying ISO 2768-mH to a specific part? Leave a comment below or contact our engineering team.