| Range of Nominal Length (mm) | Straightness / Flatness (mm) | Perpendicularity (mm) | Symmetry (mm) | Runout (mm) | | --- | --- | --- | --- | --- | | 10 to 30 | 0.05 | 0.1 | 0.2 | 0.1 | | >30 to 100 | 0.1 | 0.2 | 0.3 | 0.2 | | >100 to 300 | 0.2 | 0.4 | 0.6 | 0.4 | | >300 to 1000 | 0.3 | 0.6 | 1.0 | 0.6 | | >1000 to 3000 | 0.4 | 0.8 | 1.5 | 0.8 |
The designation is split into two distinct parts, covering different aspects of manufacturing accuracy:
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If a technical drawing states "ISO 2768-mK", it means all dimensions without specific tolerances must adhere to these "medium" linear and "K" geometric specifications.
The specific designation is one of the most commonly used general tolerance classes in precision machining, CNC milling, and turning. It establishes a baseline of acceptable accuracy for dimensions that do not require specialized high-precision tolerances. Breaking Down the Designation: What Does "mK" Mean? | Range of Nominal Length (mm) | Straightness
A 200 mm long milled surface under ISO 2768-mk must not warp by more than 0.2 mm (flatness). Its end face must be perpendicular to its base within 0.4 mm over the full length.
2. Tolerances for Broken Edges (External Radii and Chamfers) Can’t copy the link right now
In the world of precision manufacturing, specifying every single dimension with a dedicated tolerance would make technical drawings cluttered and nearly impossible to read. To solve this, engineers use general tolerance standards. The most common among these is .
Tolerances for angles also depend on the length of the shorter leg (e.g., ± 30' for lengths up to 10mm). Broken Edges: