Iso 2768 Mk Tolerance Table
| Table 1 – Allowable deviations for linear dimensions (excluding damaged edges) | |||||||||
| Value is expressed in mm | |||||||||
| Tolerance level | Allowable deviation of nominal size | ||||||||
| name | description | 0.51) ~ 3 | >3 ~ 6 | >6 ~ 30 | >30 ~ 120 | >120 ~ 400 | >400 ~ 1000 | >1000 ~ 2000 | >2000 ~ 4000 |
| f | Precision level | ±0.05 | ±0.05 | ±0.1 | ±0.15 | ±0.2 | ±0.3 | ±0.5 | - |
| m | Medium level | ±0.1 | ±0.1 | ±0.2 | ±0.3 | ±0.5 | ±0.8 | ±1.2 | ±2 |
| c | Rough grade | ±0.2 | ±0.3 | ±0.5 | ±0.8 | ±1.2 | ±2 | ±3 | ±4 |
| v | The coarsest level | - | ±0.5 | ±1 | ±1.5 | ±2.5 | ±4 | ±6 | ±8 |
| 1) For nominal dimensions below 0.5mm, the deviation shall be marked after the nominal size. | |||||||||
| Table 2 – Permissible deviations from the linear dimensions of the damaged edge (rounding radius and chamfer height) | |||||||||
| Value is expressed in mm | |||||||||
| Tolerance level | Allowable deviation of nominal size | ||||||||
| name | description | 0.5 1) ~ 3 | > 3 ~ 6 | > 6 | |||||
| f | Precision level | ±0.2 | ±0.5 | ±1 | |||||
| m | Medium level | ||||||||
| c | Rough grade | ±0.4 | ±1 | ±2 | |||||
| v | The coarsest level | ||||||||
| 1) For nominal dimensions below 0.5mm, the deviation shall be marked after the nominal size. | |||||||||
| Table 3 - Allowable deviations for angular dimensions | |||||||||
| Value is expressed in mm | |||||||||
| Tolerance level | Angle deviation of the short side of the allowed angle according to the length (mm) | ||||||||
| name | description | ≤10 | >10 ~ 50 | > 50 ~ 120 | >120 ~ 400 | > 400 | |||
| f | Precision level | ±1 ̊ | ±0 ̊30 ́ | ±0 ̊20 ́ | ±0 ̊10 ́ | ±0 ̊5 ́ | |||
| m | Medium level | ||||||||
| c | Rough grade | ±1 ̊30 ́ | ±1 ̊ | ±0 ̊30 ́ | ±0 ̊15 ́ | ±0 ̊10 ́ | |||
| v | The coarsest level | ±3 ̊ | ±2 ̊ | ±1 ̊ | ±0 ̊30 ́ | ±0 ̊20 ́ | |||
| Table 1 – General tolerances for flatness and flatness | Table 4 – General tolerances for circumferential runout | ||||||||
| Value is expressed in mm | Value is expressed in mm | ||||||||
| Tolerance level | Flat tolerances for flatness and flatness of the nominal length range | Tolerance level | Circumferential runout tolerance | ||||||
| ≤10 | >10-30 | >30-100 | >100-300 | >300-1000 | >1000-3000 | H | 0.1 | ||
| H | 0.02 | 0.06 | 0.1 | 0.2 | 0.3 | 0.4 | K | 0.2 | |
| K | 0.05 | 0.1 | 0.2 | 0.4 | 0.6 | 0.8 | L | 0.5 | |
| L | 0.1 | 0.2 | 0.4 | 0.8 | 1.2 | 1.6 | |||
| Table 2 – General tolerances for straightness | Table 3 – Symmetry General Tolerance | ||||||||
| Value is expressed in mm | Value is expressed in mm | ||||||||
| Tolerance level | Straightness tolerance of the short length of the nominal length | Tolerance level | Straightness tolerance of the short length of the nominal length | ||||||
| ≤100 | >100-300 | >300-1000 | >1000-3000 | ≤100 | >100-300 | >300-1000 | >1000-3000 | ||
| H | 0.2 | 0.3 | 0.4 | 0.5 | H | 0.5 | |||
| K | 0.4 | 0.6 | 0.8 | 1 | K | 0.6 | 0.8 | 1 | |
| L | 0.6 | ||||||||
Iso 2768 Mk Tolerance Table Pdf
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Iso 2768 Mk Tolerance Table
- Iso 2768 Hole Tolerance Table Limits, fits and tolerances calculator has been developed to calculate engineering tolerances of inner and outer features of journal bearings, linear bearings, thrust bearings, bushings, ball bearings, roller bearings, housings, cylinder bores, drilled holes, linear and precision shafts, pistons, etc.
- If general tolerances in accordance with ISO 2768 shall apply, ISO 2768 followed by the tolerance class (Ex: ISO 2768-m) shall be indicated in or near the title block. The following is the tolerance table corresponding to the 4 class precision levels, you can choose the most suitable one according to machining capabilities and your design.
- ISO 2768 and derivative geometrical tolerance standards are intendedto simplify drawing specifications for mechanical tolerances. ISO 2768 is mainly for parts that are manufactured by way of machining or removal of materials.
- Doug, there are 2 parts to ISO 2768.1 refers to tolerances for linear and angular dimensuons without tolerance indications and -2 refers to geometric tolerances for features with individual tolerance indiscations. So, in -2 you'll see that K is a tolerance class Steve.