[updated] - General Tolerance Iso 2768-mk

The "m" class defines permissible deviations for linear dimensions (such as lengths, external sizes, diameters, radii, and step heights) as well as angular dimensions.

These values are determined by choosing the longer of the two surface lengths or the diameter of the cylindrical part. Nominal Length Range (mm) Straightness & Flatness Tolerance (mm) for Class "k" Over 10 to 30 Over 30 to 100 Over 100 to 300 Over 300 to 1000 Over 1000 to 3000 2. Perpendicularity

Because ISO is globally recognized, a drawing designed in Germany using ISO 2768-mK can be accurately interpreted and manufactured by a machine shop in Japan or the United States without communication barriers. Important Exceptions and Limitations general tolerance iso 2768-mk

ISO 2768-mk is a "general" standard. You should never rely on it for: High-precision fits (e.g., H7/g6).

Perpendicularity tolerances apply to features at right angles to one another, based on the longer of the two sides. Nominal Length of Shorter Side (mm) Permissible Deviation (mm) for Class Over 100 to 300 Over 300 to 1000 Over 1000 to 3000 The "m" class defines permissible deviations for linear

Part 2 focuses on the "form" of the part. There are three classes: H, K, and L. The class is the medium-level requirement for geometry.

If you need a comparison between and ASME Y14.5 standard practices. Perpendicularity Because ISO is globally recognized

For these critical features, individual tolerances must always be specified directly on the drawing.

This part controls the shape and position of features to ensure proper fit and function. Straightness and Flatness Nominal Length Range (mm) Tolerance (mm) Over 10 to 30 Over 30 to 100 Over 100 to 300 Over 300 to 1000 Over 1000 to 3000 Other Geometrical Controls (Class K) ISO 2768 Tolerance Standards for CNC Machining - JLCCNC