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Tolerances
Plastic
TOLERANCES OF
PLASTICS ACCORDING TO
DIN 16901
Deviations from the nominal dimensions are unavoidable in the manufacture of plastic shapes.
There are various reasons for the deviations:
a) Processing parameters. These are dependent on:
• the evenness of the shape
the setting of the machine
the temperature of the tools
the distortion of the tool under pressure
b) The condition of the tool:
manufacturing tolerances for tool dimensions (see DIN 16749)
wear on tools
deviations in the position of movable tool parts.
The tolerances for this norm have been laid down taking into account these factors and numerous measurements in practice.
The plastics in this norm are divided into tolerance rows. All the plastics used by Rose₊Bopla for standard enclosures are in
row 130, for which tolerances given below apply. The tolerances apply on the basis of the machining shrinkage working into
the tool only for the appropriate enclosure with the standard material stated.
Nominal dimension area
over
0
up to
1
A
±0.18
B
±0.08
1
3
±0.19
±0.09
3
6
±0.20
±0.10
6
10
±0.21
±0.11
10
15
±0.23
±0.13
15
22
±0.25
±0.15
22
30
±0.27
±0.17
30
40
±0.30
±0.20
40
53
±0.34
±0.24
53
70
±0.38
±0.28
70
90
±0.44
±0.34
over
90
120
160
200
250
315
400
500
630
up to
120
160
200
250
315
400
500
630
800
A
±0.51
±0.60
±0.70
±0.90
±1.10
±1.30
±1.60
±2.00
±2.50
B
±0.41
±0.50
±0.60
±0.80
±1.00
±1.20
±1.50
±1.90
±2.40
800
1000
±3.00
±2.90
A = Dimensions which are not tool specific are those formed by the interaction of movable tool
parts, e.g. wall thicknesses and floor thicknesses or dimensions which are affected by
additives or pushers.
B = Tool-specific dimensions are those in the same part of the tool.
*Important: We assume no liability for quoted standards!
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