Always confirm with your manufacturing vendor that their standard machine shop setup is natively capable of holding ISO 2768-mk tolerances without requiring specialized tooling.
The 'k' class generally allows a symmetry deviation of 0.6mm. Run-out: Circular run-out for class 'k' is typically 0.2mm. Why use ISO 2768-mk?
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
Ensures consistent quality expectations between designers and suppliers globally. general tolerance iso 2768-mk
By mastering the specific limits of the "m" and "K" classes, engineering teams can optimize their workflows, lower manufacturing costs, and ensure consistent quality across global supply chains.
Perpendicularity controls the 90-degree angle between two surfaces or axes. The tolerance is based on the longer of the two legs forming the right angle: Nominal Length Range (mm) Perpendicularity Tolerance (mm) over 100 to 300 over 300 to 1000 over 1000 to 3000
Duration: 90 minutes Total marks: 100
Here is the exact tolerance breakdown for the class regarding linear dimensions, internal/external radii, and chamfer heights: Linear Dimensions Nominal Size 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 Broken Edges (External Radii and Chamfer Heights) Nominal Size Range (mm) Tolerance (mm) Over 3 to 6 Angular Dimensions Length of the Shorter Leg (mm) Tolerance (Degrees/Minutes) Over 10 to 50 Over 50 to 120 Over 120 to 400 ISO 2768-K Geometrical Tolerances (Part 2)
For class "k", the general tolerance for circular run-out is 0.2 mm .
Design engineers do not have to calculate custom tolerances for every single hole, chamfer, and slot. Always confirm with your manufacturing vendor that their
It provides a universal language between designers and manufacturers worldwide, ensuring that a part made in Germany fits a part made in the USA. When NOT to use it
Ensures that different machine shops interpret "standard accuracy" identically. Efficiency: Speeds up the CAD and inspection workflow.
: Given the high precision required in aerospace engineering, this standard can be referenced for components that do not require highly specialized tolerances. Why use ISO 2768-mk
Defines acceptable quality levels, minimizing disputes regarding part acceptability. Summary for Designers and Manufacturers When applying ISO 2768-mK, it is essential to remember: