In the world of manufacturing, a single millimeter can be the difference between a perfect assembly and a costly scrap bin. Yet, annotating every single radius, chamfer, or hole depth with a specific tolerance is impractical. This is where ISO 2768-mK becomes the unsung hero of the workshop floor.
If you have ever looked at a technical drawing and seen the cryptic note "General tolerances: ISO 2768-mK" in the title block, you were looking at a contract. It is an agreement between the designer and the machinist that says: “Unless otherwise stated, these are the rules.”
If you need it perfect, draw an arrow and write the number. For everything else, trust the "mK." Quick Reference Card | Feature | Tolerance (ISO 2768-mK) | | :--- | :--- | | 10mm length | ±0.1 mm | | 80mm length | ±0.3 mm | | 200mm length | ±0.5 mm | | Flatness (100mm) | 0.2 mm | | Perpendicularity | 0.2 mm per 10mm | | Angle (<120mm) | ±1° |
For the designer, it cleans up the drawing. For the machinist, it speeds up production. For the quality manager, it simplifies inspection. When you see that little "mK" in the title block, remember: Someone just saved the company a lot of money.