Tolerance of non-tolerated dimensions
All dimensions not specifically tolerated on the drawing must remain within certain limits. The ČSN ISO 2768-1 standard divides the values of general tolerances into four accuracy classes:
- Fine - f
- Medium - m
- Coarse - c
- Very coarse - v
Unspecified limit deviations of length dimensions
according to ČSN ISO 2768, dimensions (mm)
| A class of accuracy | from 0.5 until 3 |
from 3 until 6 |
from 6 until 30 |
from 30 until 120 |
from 120 until 400 |
from 400 until 1000 |
from 1000 until 2000 |
from 2000 until 4000 |
| f | ±0,05 | ±0,05 | ±0,1 | ±0,15 | ±0,2 | ±0,3 | ±0,5 | - |
| m | ±0,1 | ±0,1 | ±0,2 | ±0,3 | ±0,5 | ±0,8 | ±1,2 | ±2 |
| c | ±0,2 | ±0,3 | ±0,5 | ±0,8 | ±1,2 | ±2 | ±3 | ±4 |
| v | - | ±0,5 | ±1 | ±1,5 | ±2,5 | ±4 | ±6 | ±8 |
Unspecified limit deviations bevel and rounded edges
according to ČSN ISO 2768, dimensions (mm)
| A class of accuracy | from 0.5 until 3 |
from 3 until 6 |
over 6 |
| f, m | ±0,2 | ±0,5 | ±1 |
| c, v | ±0,4 | ±1 | ±2 |
Unspecified limit deviations of angular dimensions
according to ČSN ISO 2768
| A class of accuracy | until 10 | from 10 until 50 |
from 50 until 120 |
from 120 until 400 |
over 400 |
| f, m | ±1° | ±0°30' | ±0°20' | ±0°10' | ±0°05' |
| c | ±1°30' | ±1° | ±0°30' | ±0°15' | ±0°10' |
| v | ±3° | ±2° | ±1° | ±0°30' | ±0°20' |
