(in het engels) 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. If smaller tolerances are needed or bigger are more economical these tolerances should be mentioned directly according to ISO 1101. General tolerances for form and position should be used while the tolerance principle according. to ISO 8015 is valid and while this is mentioned in the drawing. This tolerance principles says that no opposite relation between measure, form and position tolerance exists (principle of superposition).
Tolerance
class |
General tolerances for straightness and evenness in mm | |||||
| Range of specified size in mm | ||||||
| to 10 | above 10
to 30 |
above 30
to 100 |
above 100
to 300 |
above 300
to 1000 |
above 1000
to 3000 |
|
H |
0,02 | 0,05 | 0,1 | 0,2 | 0,3 | 0,4 |
K |
0,05 | 0,1 | 0,2 | 0,4 | 0,6 | 0,8 |
L |
0,1 | 0,2 | 0,4 | 0,8 | 1,2 | 1,6 |
Tolerance
class |
General tolerances for straightness and evenness in mm | |||||
| Range of specified size in mm | ||||||
| to 100 | above 100
to 300 |
above 300
to 1000 |
above 1000
to 3000 |
|||
H |
0,2 | 0,3 | 0,4 | 0,5 | ||
K |
0,4 | 0,6 | 0,8 | 1 | ||
L |
0,6 | 1 | 1,5 | 2 | ||
Tolerance
class |
General tolerances for symmetry | |||||
| Range of specified size in mm | ||||||
| to 100 | above 100
to 300 |
above 300
to 1000 |
above 1000
to 3000 |
|||
H |
0,5 | |||||
K |
0,6 | 0,8 | 1 | |||
L |
0,6 | 1 | 1,5 | 2 | ||
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.
