General Tolerance Iso 2768-mk -
This report defines the general tolerance requirements for linear and angular dimensions (Part 1) as well as geometrical features (Part 2) according to . It serves as the default specification for drawings where no individual tolerances are indicated, ensuring uniformity in manufacturing and inspection.
This tells the machinist:
The callout is the most common general tolerance designation used globally, particularly for CNC machining and sheet metal fabrication. It combines two distinct parts of the standard to cover both physical size and geometric form. 1. What does "mk" stand for?
What is the (e.g., CNC milling, turning, sheet metal)? Are there any critical assembly fits or moving components? Share public link general tolerance iso 2768-mk
0.05 mm) often require more expensive machining and inspection. comparison table
Ensures features are centered correctly (e.g., 0.6 mm for lengths up to 300 mm).
: ±1° (up to 10mm length) to ±0°10' (over 400mm). ISO 2768-2: Geometrical Tolerances (Class K) This report defines the general tolerance requirements for
These values are selected based on the length of the corresponding line or the larger surface dimension: Nominal Length Range (mm) Tolerance Class Up to 10 Over 10 to 30 Over 30 to 100 Over 100 to 300 Over 300 to 1000 Over 1000 to 3000 Perpendicularity
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: For parts and assemblies where specific tolerances are not given, ISO 2768-MK provides a general framework to ensure that parts are manufactured within acceptable limits. It combines two distinct parts of the standard
While ISO 2768-mK is an exceptional baseline, it should not be applied blindly. Engineers must override the general tolerance in the following situations:
| Feature | Permissible Deviation (mm) | | :--- | :--- | | Run-out (all nominal sizes) | 0.2 |
The code is broken down into two distinct classes: