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) directly next to that specific dimension on the drawing. Specific callouts always override general standards. Best Practices for Designers and Machinists
| Nominal Size Range (mm) | Permissible Deviation (mm) | | :--- | :--- | | 0.5 up to 3 | ±0.1 | | >3 up to 6 | ±0.1 | | >6 up to 30 | ±0.2 | | >30 up to 120 | ±0.3 | | >120 up to 400 | ±0.5 | | >400 up to 1000 | ±0.8 | | >1000 up to 2000 | ±1.2 |
The following be covered by ISO 2768-mk:
| Tolerance Grade | Linear Tolerance (mm) | Angular Tolerance (°) | | --- | --- | --- | | f (Fine) | ±0.05 to ±0.5 | ±0.05 to ±0.5 | | m (Medium) | ±0.1 to ±1.0 | ±0.1 to ±1.0 | | c (Coarse) | ±0.2 to ±2.0 | ±0.2 to ±2.0 | | v (Very Coarse) | ±0.5 to ±5.0 | ±0.5 to ±5.0 | general tolerance iso 2768-mk
: Governed by ISO 2768-1 , this defines permissible deviations for linear and angular dimensions, such as lengths, radii, and chamfers.
1000 to 2000 mm: ±3.0 mm
| Nominal Size Range | Permissible Deviation (± mm) | |--------------------|-------------------------------| | 0.5 – 3 | ±0.1 | | >3 – 6 | ±0.1 | | >6 – 30 | ±0.2 | | >30 – 120 | ±0.3 | | >120 – 400 | ±0.5 | | >400 – 1000 | ±0.8 | | >1000 – 2000 | ±1.2 | ) directly next to that specific dimension on the drawing
values. Designers only need to write "ISO 2768-mK" in the title block.
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It signals to the machine shop that standard workshop accuracy is sufficient for non-critical areas, preventing over-processing and reducing costs. 1000 to 2000 mm: ±3
Understanding ISO 2768-mK: The Standard for General Tolerances in Machining
ISO 2768-mk provides a cost-effective, industry-standard default tolerance for machined parts where precision is not critical. It balances manufacturing ease with acceptable quality. However, engineers must explicitly specify tighter tolerances for mating, safety, or high-precision features. This report shall be appended to the company’s quality management system (QMS) as the reference for general tolerance compliance.
General tolerances for circularity and total run-out are often handled by the same principles as the straightness/flatness of the related surfaces. KEYENCE CORPORATION OF AMERICA Application & Implementation Drawing Note:
Quality assurance teams immediately know what baseline matrix to test against, standardizing the inspection process.
Implementing this standard provides significant advantages across design and production workflows: