This this the tolerance table intended to simplify drawing indications and specifies general tolerances in four tolerance classes. It applies to the dimensions of workpieces that are produced by metal removal or are formed from sheet metal. It contains three tables and an informative annex with regard to concepts behind general tolerancing of dimensions.
General tolerances for linear measures according to DIN ISO 2768-1
Table one - Permissible deviations for linear dimensions except for broken edges (external radus and chamfer heights)
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Permissible deviations for basic size range in mm |
| Designation |
Description |
from 0.5# upto 3 |
Over 3 upto 6 |
over 6 upto 30 |
over 30 upto 120 |
over 120 upto 400 |
over 400 upto 1000 |
over 1000 upto 2000 |
over 2000 upto 4000 |
| f |
fine |
±0,05 |
±0,05 |
±0,10 |
±0,15 |
±0,20 |
±0,30 |
±0,50 |
Nil |
| m |
medium |
±0,10 |
±0,10 |
±0,20 |
±0,30 |
±0,50 |
±0,80 |
±1.20 |
±2.00 |
| c |
coarse |
±0,20 |
±0,30 |
±0,50 |
±0,80 |
±1.20 |
±2.00 |
±3.00 |
±4.00 |
| v |
very coarse |
Nil |
±0,50 |
±1.00 |
±1.50 |
±2.50 |
±4.00 |
±6.00 |
±8.00 |
Table two - Permissible deviations for broken edges (external radius and chamfer heights)
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Permissible deviations for basic size range in mm |
Designation |
Description |
from 0.5# upto 3 |
over 3 upto 6 |
over 6 |
| f |
fine |
±0,20 |
±0,50 |
±1.00 |
| m |
medium |
| c |
coarse |
±0,40 |
±1.00 |
±2.00 |
| v |
very coarse |
Table three - Permissible deviations for angular dimensions
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Permissible deviations for ranges of Lengths in mm of shorter side of the angle concerned |
Designation |
Description |
upto 10 |
over 10 upto 50 |
over 50 upto 120 |
over 120 upto 400 |
over 400 |
| f |
fine |
±1.00° |
±0.500° |
±0.333° |
±0.166° |
±0.083° |
| m |
medium |
| c |
coarse |
±1.500° |
±1.000° |
±0.500° |
±0.250° |
±0.166° |
| v |
very coarse |
±3.00° |
±2.000° |
±1.000° |
±0.500° |
±0.333° |
#For nominal size below 0.5mm the deviation shall be indicated adjacent to the relevant nominal size(s)
General tolerances for form and position
DIN ISO 2768-2 is for simplifying drawing and fixes general tolerances in three tolerance classes for form and position. By choosing a special tolerance class exactly the precision level common in workshops should be taken into account.
General tolerances for straightness and evenness in mm
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Permissible deviations for basic size range in mm |
Designation |
Description |
upto 10 |
over 10 upto 30 |
over 30 upto 100 |
over 100 upto 300 |
over 300 upto 1000 |
over 1000 upto 3000 |
| H |
|
0.02 |
0.05 |
0.10 |
0.20 |
0.30 |
0.40 |
| K |
|
0.05 |
0.10 |
0.20 |
0.40 |
0.60 |
0.80 |
| L |
|
0.10 |
0.20 |
0.40 |
0.80 |
1.20 |
1.60 |
General tolerances for straightness and evenness in mm
| |
|
Permissible deviations for basic size range in mm |
Designation |
Description |
upto 100 |
over 100 upto 300 |
over 300 upto 1000 |
over 1000 upto 3000 |
| H |
|
0.20 |
0.30 |
0.40 |
0.50 |
| K |
|
0.40 |
0.60 |
0.80 |
1.00 |
| L |
|
0.60 |
1.00 |
1.50 |
2.00 |
General tolerances for symmetry
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Permissible deviations for basic size range in mm |
Designation |
Description |
upto 100 |
over 100 upto 300 |
over 300 upto 1000 |
over 1000 upto 3000 |
| H |
|
0.50 |
| K |
|
0.6- |
0.80 |
1.00 |
| L |
|
0.60 |
1.00 |
1.50 |
2.00 |
Note: General tolerances for form and position are valid for form elements for which form and position tolerances are not indicated individually. They are applicable for all characteristics of the form elements accept cylinders, profiles of any line or surfaces, inclines, coaxiality, position and total movement.
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