General Tolerances to DIN ISO 2768
Aug 09,2019 | Views: 6440
General Tolerances @ E-Mold (apply unless specified otherwise)
CNC (Metals): DIN ISO 2768 fine,
CNC (Plastics): DIN ISO 2768 medium
GENERAL TOLERANCES FOR LINEAR AND ANGULAR DIMENSIONS (DIN ISO 2768 T1)
LINEAR DIMENSIONS:
| Permissible deviations in mm for ranges in nominal lengths |
Fine |
Tolerance class designation (description) | Very coarse | |
| Medium | Coarse | |||
| 0.5 up to 3 | ±0.05 | ±0.1 | ±0.2 | - |
| over 3 up to 6 | ±0.05 | ±0.1 | ±0.3 | ±0.5 |
| over 6 up to 30 | ±0.1 | ±0.2 | ±0.5 | ±1.0 |
| over 30 up to 120 | ±0.15 | ±0.3 | ±0.8 | ±1.5 |
| over 120 up to 400 | ±0.2 | ±0.5 | ±1.2 | ±2.5 |
| over 400 up to 1000 | ±0.3 | ±0.8 | ±2.0 | ±4.0 |
| over 1000 up to 2000 | ±0.5 | ±1.2 | ±3.0 | ±6.0 |
| over 2000 up to 4000 | - | ±2.0 | ±4.0 | ±8.0 |
EXTERNAL RADII AND CHAMFER HEIGHTS
| Permissible deviations in mm for ranges in nominal lengths |
Fine |
Tolerance class designation (description) | Very coarse | |
| Medium | Coarse | |||
| 0.5 up to 3 | ±0.2 | ±0.2 | ±0.4 | ±0.4 |
| over 3 up to 6 | ±0.5 | ±0.5 | ±1.0 | ±1.0 |
| over 6 | ±1.0 | ±1.0 | ±2.0 | ±2.0 |
ANGULAR DIMENSIONS
| Permissible deviations in mm for ranges in nominal lengths |
Fine |
Tolerance class designation (description) | Very coarse | |
| Medium | Coarse | |||
| up to 10 | ±1º | ±1º | ±0º30' | ±3º |
| over 10 up to 50 | ±0º30' | ±0º30' | ±1º | ±2º |
| over 50 up to 120 | ±0º20' | ±0º20' | ±0º30' | ±1º |
| over 120 up to 400 | ±0º10' | ±0º10' | ±0º15' | ±0º30' |
| over 400 | ±0º5' | ±0º5' | ±0º10' | ±0º20' |
GENERAL TOLERANCES FOR FORM AND POSITION (DIN ISO 2768 T2)
STRAIGHTNESS AND FLATNESS
| Ranges in nominal lengths in mm | Tolerance class | ||
| H | K | L | |
| up to 10 | 0.02 | 0.05 | 0.1 |
| over 10 up to 30 | 0.05 | 0.1 | 0.2 |
| over 30 up to 100 | 0.1 | 0.2 | 0.4 |
| over 100 up to 300 | 0.2 | 0.4 | 0.8 |
| over 300 up to 1000 | 0.3 | 0.6 | 1.2 |
| over 1000 up to 3000 | 0.4 | 0.8 | 1.6 |
PERPENDICULARITY
| Ranges in nominal lengths in mm | Tolerance class | ||
| H | K | L | |
| up to 100 | 0.2 | 0.4 | 0.6 |
| over 100 up to 300 | 0.3 | 0.6 | 1 |
| over 300 up to 1000 | 0.4 | 0.8 | 1.5 |
| over 1000 up to 3000 | 0.5 | 0.8 | 2 |
SYMMETRY
| Ranges in nominal lengths in mm | Tolerance class | ||
| H | K | L | |
| up to 100 | 0.5 | 0.6 | 0.6 |
| over 100 up to 300 | 0.5 | 0.6 | 1 |
| over 300 up to 1000 | 0.5 | 0.8 | 1.5 |
| over 1000 up to 3000 | 0.5 | 1 | 2 |
RUN-OUT
| Tolerance class | ||
| H | K | L |
| 0.1 | 0.2 | 0.5 |
Case Studies
- CNC Machining
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