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Tolerances
Aluminum
TOLERANCES FOR CHILL
CASTINGS (DIN 1688)*
In the case of raw castings made of light metal alloys in the chill casting process, all deviations in
dimensions are essentially dependent on :
a). the dimensional accuracy of the mold, characterized by the degree of accuracy
b). the position of the mold division, cores, extenders, characterized by the subdivision into intrinsic
and non-intrinsic dimensions (see DIN 1680 part 1)
c). the nominal dimensions.
Table 1. Deviations in lengthwise dimensions (lengths, widths, heights, central distances, diameters, roundings).
Degree of
accuracy
GTA 15/5
Shape
dependency
Intrinsic
up to
18
±0.45
over
18
up to
30
±0.50
over
30
up to
50
±0.60
over
50
up to
80
±0.75
over
80
up to
120
±0.85
Nominal Dimension Area
over over over over
120 180 250 315
up to up to up to up to
180 250 315 400
±1.00 ±1.20 ±1.30 ±1.40
over
400
up to
500
±1.60
over
500
up to
630
±1.70
over
630
up to
800
±2.00
over
800
up to
1000
±2.30
over
1000
up to
1250
±2.60
Non-Intrinsic ±0.55 ±0.65 ±0.80 ±0.95 ±1.10 ±1.30 ±1.50 ±1.60 ±1.80 ±2.00 ±2.20 ±2.50 ±2.80 ±3.30
Table 2. Deviations in thickness (wall thicknesses, ledges, ribs).
Nominal Dimension Area
Degree of
Shape
over
over
accuracy
dependency
6
10
up to
up to
up to
6
10
18
GTA 15/5
Intrinsic
Non-Intrinsic
±0.60
±0.80
±1.20
±1.50
±1.80
±2.20
Intrinsic dimensions are those in the same parts of the
tool. Non-intrinsic dimensions are those created by the
interactions of movable tool components, e.g. wall
thicknesses and base thicknesses or dimensions
affected by additives or extenders.
*Important: We assume no liability for quoted standards!
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