| |
DIN 7168 - General dimension tolerances
DIN 7168 is a general
tolerance standard for linear and angular dimensions, which could be
widely used for inspection to cast iron
and cast steel castings. It is a very useful standard for buyers and
suppliers.
Table 1. Permissible deviations for linear dimensions
except for external radii and chamfer heights
|
Tolerance
class |
Permissible
deviations, in mm, for nominal sizes, in mm, |
|
from
0.5
to
3 |
over
3
up to
6 |
over
6
up to
30 |
over
30
up to
120 |
over
120
up to
400 |
over
400
up to
1000 |
over
1000
up to
2000 |
over
2000
up to
4000 |
over
4000
up to
8000 |
over
8000
up to
12000 |
over
12000
up to
16000 |
over
16000
up to
20000 |
|
f
(fine) |
±0.05 |
±0.05 |
±0.1 |
±0.15 |
±0.2 |
±0.3 |
±0.5 |
±0.8 |
－ |
－ |
－ |
|
|
m
(medium) |
±0.1 |
±0.1 |
±0.2 |
±0.3 |
±0.5 |
±0.8 |
±1.2 |
±2 |
±3 |
±4 |
±5 |
±6 |
|
g
(coarse) |
±0.15 |
±0.2 |
±0.5 |
±0.8 |
±1.2 |
±2 |
±3 |
±4 |
±5 |
±6 |
±7 |
±8 |
|
sg
(very
coarse) |
－ |
±0.5 |
±1 |
±1.5 |
±2 |
±3 |
±4 |
±6 |
±8 |
±10 |
±12 |
±12 |
|
For nominal
sizes below 0.5 mm, the deviations shall be indicated
adjacent to the relevant nominal size. |
Table 2. Permissible deviations for external radii and chamfer
heights
|
Tolerance
class |
Permissible
deviations, in mm,
for nominal
sizes, in mm, |
|
from
0.5
to
3 |
over
3
up to
6 |
over
6
up to
30 |
over
30
up to
120 |
over
120
up to
400 |
|
F (fine) |
±0.2 |
±0.5 |
±1 |
±2 |
±4 |
|
M (medium) |
|
G (coarse) |
±0.2 |
±1 |
±2 |
±4 |
±8 |
|
Sg (very
coarse) |
Table 3. Permissible deviations for angular dimensions
|
Tolerance
class |
Permissible
deviations, in units of angle, for nominal sizes of the
shorter leg, in mm. |
|
over
10 |
over
10
up to
50 |
over
50
up to
120 |
over
120
up to
400 |
over
400 |
|
F (fine) |
±1° |
±30′ |
±20′ |
±10′ |
±5′ |
|
M (medium) |
|
G (coarse) |
±1°30′ |
±50′ |
±25′ |
±15′ |
±10′ |
|
Sg (very
coarse) |
±3° |
±2° |
±1° |
±30′ |
±20′ |
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