These tolerances apply to lengths, diameters, and radii where no specific tolerance is indicated on the drawing. Nominal Length Range (mm) Tolerance (± mm) Over 3 to 6 Over 6 to 30 Over 30 to 120 Over 120 to 400 Over 400 to 1000 Over 1000 to 2000 Over 2000 to 4000 Engineers Edge 2. ISO 2768-2: Geometrical Tolerances (Class K)
For class , the general tolerance for circular run-out (radial, axial, and any surface of revolution) is 0.2 mm . Why Use ISO 2768-mK?
Standardizing on a "medium" tolerance prevents engineers from over-specifying tight tolerances. Unnecessarily tight tolerances force machinists to slow down and use expensive setups, which drives up production costs. general tolerance iso 2768-mk
The designation sets specific limits on how much a feature can deviate in shape or position. This section defines tolerances for straightness, flatness, perpendicularity, and symmetry. It also includes a specific rule regarding run-out.
: Typically allowed up to 0.4 mm or 0.6 mm depending on the length of the shorter leg. : Generally allows a deviation of 0.6 mm. : Specified at 0.2 mm for class K. Why Use ISO 2768-mK? Consistency : Ensures that all manufacturers (like MakerVerse ) use the same baseline for "medium" quality parts. Efficiency These tolerances apply to lengths, diameters, and radii
Applicable to external radii, chamfer heights, and linear sizes (lengths, widths, diameters).
Extra credit
In mechanical engineering, specifying individual tolerances for every single dimension on a technical drawing is highly inefficient. It clutters blueprints, increases design time, and raises manufacturing costs.
In mechanical engineering and manufacturing, clear communication between designers and machinists is critical. If every single dimension on a technical drawing required an explicit tolerance, the blueprint would become an unreadable cluster of numbers. To solve this problem, the International Organization for Standardization developed . Why Use ISO 2768-mK
Functionality. 'cL' is too loose for sliding fits, rotating shafts, or aligned mounting holes. 'mk' ensures basic interchangeability.
If you’ve seen "ISO 2768-mk" in the title block of a blueprint, What is ISO 2768?
