General Tolerance Iso 2768-mk Jun 2026

For linear measurements like external/internal sizes, heights, and distances. Nominal Range (mm) Tolerance (± mm) 120 to 400 400 to 1000 Geometric Tolerances (Class K)

Set at 0.6 mm for features up to 300 mm, increasing to 1.0 mm for larger features. Circular Run-out: Generally specified as 0.2 mm. Why Use ISO 2768-mK?

Thread tolerances (like 6H or 6g) must be specified separately.

It prevents "over-tolerancing." If a non-critical bracket is made to a "Fine" (f) tolerance when "Medium" (m) would do, the price can double due to increased inspection and slower machining. 5. Critical Limitations

This tells anyone viewing the document that for every dimension without a specific tolerance attached, they must look up the "m" classification for its size, and the "K" classification for its geometric layout. Important Rules and Limitations general tolerance iso 2768-mk

This public link is valid for 7 days and shares a thread, including any personal information you added. This link or copies made by others cannot be deleted. If you share with third parties, their policies apply. Can’t copy the link right now. Try again later.

If you write "±0.05" next to a dimension, that specific value overrides the general ISO 2768-mK class for that feature.

Quality inspectors know exactly what baseline standard to judge the parts by, allowing for faster component sign-offs. How to Indicate ISO 2768-mK on a Drawing

If your assembly has a critical mating part—such as a bearing press-fit or a sealed O-ring groove—the general tolerances of ISO 2768-mk will likely be too loose. In these scenarios, you must (e.g., or a fit callout like Why Use ISO 2768-mK

If your drawing title block says "ISO 2768-mK," but you explicitly label a critical slot as 20.00mm +0.02 / -0.00 , the manufacturer must prioritize the +0.02mm limit for that slot while applying the standard ISO ±0.2mm tolerance to the rest of the part. Conclusion

: This tolerance class defines the medium tolerance for linear dimensions. It offers a balanced approach, providing reasonable tolerances that are not too tight, which could be difficult and costly to achieve, nor too loose, which could compromise the functionality and interchangeability of parts.

What are you using? (CNC milling, sheet metal, molding, etc.) What material is the part made of? Are there any critical mating parts involved? Share public link

Geometrical tolerances control the form and orientation of features. The "K" class sets standard limits for straightness, flatness, perpendicularity, symmetry, and run-out. Straightness and Flatness It offers a balanced approach

If you are working with a (like plastics) that might require different tolerance considerations.

Instead of placing ±0.2 or ±0.5 on fifty different dimensions across a drawing, a single note in the title block covers them all.

Answer key (concise) — for examiner use only