| Nominal Length Range | Straightness / Flatness | Perpendicularity | | :--- | :--- | :--- | | ≤ 10 mm | 0.05 mm | 0.1 mm | | >10 – 30 mm | 0.1 mm | 0.2 mm | | >30 – 100 mm | 0.2 mm | 0.3 mm | | >100 – 300 mm | 0.3 mm | 0.4 mm | | >300 – 1000 mm | 0.5 mm | 0.6 mm | | >1000 – 3000 mm | 0.8 mm | 0.8 mm |
Below is a structured report template you can use to document compliance or inspection for a part under this standard. 1. General Information Part Name/Number: [Enter Part Name] Material: [Enter Material, e.g., Aluminum 6061]
The uppercase refers to the Medium class for geometric features. ISO 2768-2 defines three classes for features like flatness, straightness, and perpendicularity: H: High precision. K: Medium precision. L: Low precision. ISO 2768-mK Tolerance Tables ıso 2768 mk
Or simply:
The lowercase stands for the Medium tolerance class. ISO 2768-1 defines four classes for linear and angular dimensions: f (Fine): For precision components. | Nominal Length Range | Straightness / Flatness
These values are symmetric (±), meaning the deviation is allowed equally above and below the nominal size. This symmetry is ideal for fits where the clearance or interference is not critical.
In the drawing’s title block or general notes, write: ISO 2768-2 defines three classes for features like
The following tolerances apply to linear dimensions (excluding external radii and chamfer heights): Nominal Size Range (mm) Tolerance (± mm) Measured Value Result (Pass/Fail) 120 to 400 400 to 1000