ISO 2768-mk: The Complete Guide to General Tolerances In the world of precision manufacturing, specifying every single dimension with a dedicated tolerance would make technical drawings unreadable and engineering hours prohibitively expensive. This is where comes in.
There are three primary advantages to referencing ISO 2768-mK on a technical drawing:
is a standard for general tolerances used on engineering drawings when no specific tolerances are indicated. It combines two parts: "m" (medium) from ISO 2768-1 for linear and angular dimensions, and "K" from ISO 2768-2 for geometrical features like flatness and symmetry. Part 1: Linear Dimensions (Class "m")
The provides specific limits for straightness, flatness, perpendicularity, and symmetry. These are "general" tolerances; if a specific GD&T (Geometric Dimensioning and Tolerancing) callout is not on the drawing, these values apply.
| Nominal Size Range | Tolerance (mm) | |--------------------|----------------| | 0.5 to 3 | ±0.2 | | >3 to 6 | ±0.5 | | >6 | ±1.0 |
The following tables outline the permissible deviations (in mm) for the "m" and "K" classes. Linear Dimensions (Class m)
ISO 2768-mk: The Complete Guide to General Tolerances In the world of precision manufacturing, specifying every single dimension with a dedicated tolerance would make technical drawings unreadable and engineering hours prohibitively expensive. This is where comes in.
There are three primary advantages to referencing ISO 2768-mK on a technical drawing:
is a standard for general tolerances used on engineering drawings when no specific tolerances are indicated. It combines two parts: "m" (medium) from ISO 2768-1 for linear and angular dimensions, and "K" from ISO 2768-2 for geometrical features like flatness and symmetry. Part 1: Linear Dimensions (Class "m")
The provides specific limits for straightness, flatness, perpendicularity, and symmetry. These are "general" tolerances; if a specific GD&T (Geometric Dimensioning and Tolerancing) callout is not on the drawing, these values apply.
| Nominal Size Range | Tolerance (mm) | |--------------------|----------------| | 0.5 to 3 | ±0.2 | | >3 to 6 | ±0.5 | | >6 | ±1.0 |
The following tables outline the permissible deviations (in mm) for the "m" and "K" classes. Linear Dimensions (Class m)
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