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DIN ISO 2768 Tolerances Guide

According to the document: 1. DIN ISO 2768-1 establishes general tolerances for linear measures and level squares with four tolerance classes (fine, medium, coarse, very coarse) to simplify drawings. 2. Smaller tolerances can be indicated next to the nominal size if needed. Tabular limits for dimensions and tolerances are provided for each tolerance class. 3. DIN ISO 2768-2 establishes general tolerances for form and position in three classes and should be used when the tolerance principle according to ISO 8015 applies. Tabular limits for straightness, evenness, and symmetry tolerances are also provided.

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463 views2 pages

DIN ISO 2768 Tolerances Guide

According to the document: 1. DIN ISO 2768-1 establishes general tolerances for linear measures and level squares with four tolerance classes (fine, medium, coarse, very coarse) to simplify drawings. 2. Smaller tolerances can be indicated next to the nominal size if needed. Tabular limits for dimensions and tolerances are provided for each tolerance class. 3. DIN ISO 2768-2 establishes general tolerances for form and position in three classes and should be used when the tolerance principle according to ISO 8015 applies. Tabular limits for straightness, evenness, and symmetry tolerances are also provided.

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According to DIN ISO 2768-1

General tolerances for linear measures and level squares with four tolerance classes are useful
for simplifying drawings. By choosing the tolerance class precision levels common in workshops
should be taken into account.
If smaller tolerances are needed or bigger ones are more economical,
then these tolerances are indicated next to the nominal size.
Tabular 1 Limits for linear measures
Limits in mm for nominal sizes in mm
Tolerance
- above above    above   above above above above
0,5 to
class 3 to 6 6 to 30 30 to 120 to 400 1000 2000
3
120 400 to 1000 to 2000 to 4000
f (fine) � � 0,05 � 0,1 � 0,15 � 0,2 � 0,3 � 0,5 -
0,05
m � 0,1 � 0,1 � 0,2 � 0,3 � 0,5 � 0,8 � 1,2 �2
(medium)
c (coarse) � � 0,2 � 0,5 � 0,8 � 1,2 �2 �3 �4
0,15
v (very - � 0,5 �1 � 1,5 � 2,5 �4 �6 �8
coarce
grob)
For nominal sizes below 0,5 mm the limit measures are to be indicated directly at the nominal
measure.
Tabular 2 Limit measures for radius of curvature and chamfer height
Limits in mm for nominal sizes in mm
Tolerance
class 0,5 above 3 above 6
to 3 to 6
f (fine)
� 0,2 � 0,5 �1
m (medium)

v (very c (coarse) � 0,4


coarse)� 1�
2

to 10 above 10 above 50 above 50 above 400


to 50 to 120 to 400
f (fine)
m �1� � 30 ' � 20 ' � 10 ' �5'
(medium)
� 15 '� 10 ' c (coarse ) � 1 � 30 '
v (very �3� �2� �1� � 30 ' � 20 '
coarce)� 1
�� 30 '

For nominal sizes below 0,5 mm the limit measures are to be indicated directly at the nominal
measure. If general tolerances according to ISO 2768-1 are valid, the following has to be inserted
in the title box, i.e. for tolerance class medium
ISO 2768 � m or general tolerance ISO 2768 � m
For new designs only the general tolerance according to DIN ISO 2768-1 should be valid. The limit
measurements of the tolerance classes m and f of DIN ISO 2768-1 are identic with those of DIN
7168-1.
 General tolerances for form and position

according to DIN ISO 2768-2


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).
General tolerances for straightness and evenness in mm

Tolerance Range of specified size in mm

above 10 above 30 above 100 above 300 above 1000


class
to 10 to 30 to 100 to 300 to 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
General tolerances for straightness and evenness in mm
Tolerance Range of specified size in mm
  above 100 above 300 above 1000
class
to 100 to 300 to 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
General tolerances for symmetry

Range of specified size in mm


Tolerance
  above 100 above 300 above 1000
class
to 100 to 300 to 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.

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