General Tolerance Iso 2768-mk Verified -
The tolerance for symmetry uses the longer of the two form elements as a reference. The general tolerance is not specified in the search results.
By using the "mK" combination, engineers ensure that a component is manufactured to a standard medium precision without needing to manually label every single feature. ISO 2768-m (Part 1): Linear and Angular Dimensions
Quality inspection teams have an unambiguous, globally recognized standard to verify parts against during final inspections. When to Override ISO 2768-mK
The lowercase letter "m" represents the "Medium" tolerance class. ISO 2768-1 outlines four tolerance classes for linear dimensions: f (Fine), m (Medium), c (Coarse), and v (Very Coarse). general tolerance iso 2768-mk
Geometrical tolerances control form, orientation, and run-out. The class enforces medium control over these geometric features. Straightness and Flatness
Over-tolerancing driving up manufacturing prices is a frequent engineering error. ISO 2768-mK keeps variations wide enough for rapid production while remaining tight enough for mechanical components to fit together.
Permissible Deviations for Broken Edges (External Radii and Chamfers) The tolerance for symmetry uses the longer of
What are you using? (CNC machining, sheet metal, injection molding?) What is the primary material of the part? Share public link
The designation ISO 2768-mK an international standard used in manufacturing to define general tolerances for dimensions and geometric features that do not have specific tolerance callouts on a technical drawing
It's worth being aware that the ISO 2768 series is in the process of being superseded by . This new standard provides more comprehensive rules for general geometrical and size specifications and aims to modernize the approach to tolerancing. ISO 2768-m (Part 1): Linear and Angular Dimensions
: Refers to ISO 2768-2 , which defines geometric tolerances such as flatness, straightness, and perpendicularity. When to Use This Callout
ISO 2768 was originally designed primarily for metal-cutting machining processes (like milling and turning). If you apply ISO 2768-mK to highly flexible plastics or 3D-printed components, the shrinkage and warp rate of the material might make achieving these standard medium limits naturally unrealistic without specialized setups.
Do you use ISO 2768-mk on your drawings? Have you ever had a part fail because the general tolerance was too loose? Let us know in the comments below.
If a single specific feature requires a tighter tolerance (e.g., a press-fit bearing shaft that needs a ±0.01 mm window), the engineer simply overrides the general standard by typing that specific tolerance directly next to the dimension on the layout.
