Utdrag ur ISO 2768

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

Tolerance-

class

Limits in mm for nominal sizes in mm

0,5 to 3

above
3 to 6

above    6 to 30

above   30 to 120

above 120 to 400

above 400
to 1000

above 1000
to 2000

above 2000
to 4000

f (fine)

± 0,05

± 0,05

± 0,1

± 0,15

± 0,2

± 0,3

± 0,5

-

m (medium)

± 0,1

± 0,1

± 0,2

± 0,3

± 0,5

± 0,8

± 1,2

± 2

c (coarse)

± 0,15

± 0,2

± 0,5

± 0,8

± 1,2

± 2

± 3

± 4

v (very coarce grob)

-

± 0,5

± 1

± 1,5

± 2,5

± 4

± 6

± 8

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

Tolerance

class

Limits in mm for nominal sizes in mm

0,5

to 3

above 3

to 6

above 6

f (finne)

± 0,2

± 0,5

± 1

m (medium)
c (coarse)

± 0,4

± 1

± 2

v (very coarse)

Bei Nennmassen unter 0,5 mm sind die Grenzabmasse direkt am Nennmass anzugeben.

Tabelle 3 Grenzabmasse für Winkelmasse

Tolerance class

Limits in mm for nominal sizes in mm

to 10

above 10

to 50

above 50

to 120

above 50

to 400

above 400

f (fine)

± 1 °

± 30 '

± 20 '

± 10 '

± 5 '

m (medium)
c (coarse )

± 1 ° 30 '

± 1 °

± 30 '

± 15 '

± 10 '

v (very coarce)

± 3 °

± 2 °

± 1 °

± 30 '

± 20 '


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 insertedin 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.

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