In the world of manufacturing, a single drawing is a contract. It promises that a hole will align with a shaft, that an edge will not cut a hand, and that a thousand identical parts will assemble without friction. But detailing every single dimension with a specific tolerance is time-consuming, expensive, and often unnecessary.
| Nominal size range (mm) | Permitted 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 | iso 2768-mk
When used correctly, it saves hours of drafting time, reduces quoting confusion, and keeps parts affordable. When misunderstood, it leads to assemblies that won’t close and suppliers who blame the drawing. In the world of manufacturing, a single drawing