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LEADING THE FUTURE

Iso 2768-mh Tolerance Chart < 2024 >

For linear dimensions (lengths, widths, depths, steps, etc.), class m (medium) applies.

Limitations:

Pitfalls:

Best practices:

ISO 2768 is a standard providing general tolerances for linear and angular dimensions on technical drawings when no specific tolerance is indicated. This paper explains the scope and purpose of ISO 2768, details the tolerance classes (f, m, c, v), focuses on the “m” (medium) grade for machining (ISO 2768‑m), discusses the interpretation and application of ISO 2768‑m for linear, angular, and geometric features, shows worked examples and charts, comments on limitations and best practices, and compares ISO 2768 with other tolerance systems. Practical recommendations and a sample tolerance chart for ISO 2768‑m are included. iso 2768-mh tolerance chart

Tolerances in mm for nominal size ranges. Applies to external radii, chamfers, and linear dimensions (except broken edges).

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

Applies to dimensions where no individual tolerance is specified.

Angles are treated slightly differently. For Class 'm', the tolerance is expressed in millimeters per millimeter of the shorter side. For linear dimensions (lengths, widths, depths, steps, etc

| Nominal Angle Range | Tolerance Class 'm' | | :--- | :--- | | Up to 10mm length of shorter side | ±1° | | >10mm up to 50mm | ±0°30' (30 arc minutes) | | >50mm up to 120mm | ±0°20' (20 arc minutes) | | >120mm up to 400mm | ±0°10' (10 arc minutes) | | >400mm | ±0°5' (5 arc minutes) |

Crucial Note: 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'.

| Symbol | Meaning | |--------|---------| | m | Tolerance class: Medium (options: f = fine, m = medium, c = coarse, v = very coarse) | | H | Specific to holes – internal dimension tolerances (based on ISO 286) |

So ISO 2768-mH means:

Note: Some drawings use “mK” for shafts. mH is specifically for holes/internal features.

Below is a practical reproduction of the ISO 2768‑1 linear tolerance values for grade "m" (medium). Note: the exact numbers below are representative; always verify against the official ISO 2768‑1:1989/2000 standard edition used by your organization or the most current national adoption.

Tolerance (grade m) for length L (mm):

(Explanation: For a nominal dimension within each size range, the permissible deviation is ± the listed value.) Pitfalls:

Angular tolerances (when not otherwise specified), typical values for grade m:

Notes: