These tolerances apply to features like fillets and chamfers. Notably, for the medium class, the deviations are the same as the fine (f) class.
You don't have to clutter your CAD exports with "±" values for every single fillet or shoulder.
For angular deviations, measured by the length of the shorter leg of the angle: Length of Shorter Leg (mm) Tolerance Limit for Class m ±1∘plus or minus 1 raised to the composed with power Part 2: ISO 2768-2 (H) – Geometrical Tolerances
For your workshop wall or CAD template, condense the ISO 2768-mh tolerance chart into this quick-reference table: iso 2768-mh tolerance chart
If you design a shaft with a length of 50mm and do not write a tolerance, ISO 2768-mh applies. Looking at the chart, 50mm falls into the ">30 up to 120" row. Therefore, the acceptable length is 50mm ±0.3mm (49.7mm to 50.3mm).
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ISO 2768‑1 also provides default angular tolerances (e.g., ±1° for coarse grades, ±0.5° for medium — see the standard for exact figures) and for unspecified radii/chamfers. These tolerances apply to features like fillets and chamfers
When a machinist reads a drawing labeled "ISO 2768-mh" in the title block, they apply these steps:
This part of the standard applies to dimensions such as external sizes, internal sizes, step sizes, diameters, radii, and distances. The permissible deviations are defined by four tolerance classes (f, m, c, v), each becoming progressively larger. The table below details the specific deviations for the medium (m) class for linear dimensions, chamfers, and angles.
The designation "ISO 2768-mh" is broken down into two distinct parts, each representing a specific section of the standard and a corresponding accuracy level. Part 1: Linear and Angular Dimensions (The "m") For angular deviations, measured by the length of
For engineers, machinists, and designers, defining every single dimension on a technical drawing with a specific tolerance is both time-consuming and prone to error. This is where comes in.
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