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TOLERANCES FOR
PRESSURE DIECASTINGS
(DIN 1688*)
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1) Determining the spatial diagonal:
The spatial diagonal R is that between the extreme points of the casting.
It is calculated from the nominal dimensions of the prismatic body, which delimits the casting, whatever its shape
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Table 1. Tolerances of dimensions for lengths, widths, heights, central distances, diameters and roundings.
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Spatial
diagonal
area
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Degree of
exactitude
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Shape
dependency
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Nominal Dimension Area
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up to
18
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over
18
up to
30
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over
30
up to
50
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over
50
up to
80
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over
80
up to
120
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over
120
up to
180
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over
180
up to
250
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over
250
up to
315
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over
315
up to
400
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over
400
up to
500
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over
500
up to
630
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over
630
up to
800
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over
800
up to
1000
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over
1000
up to
1250
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over 180
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GTA 13
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Intrinsic
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±0.14
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±0.17
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±0.20
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±0.23
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±0.27
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±0.32
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Non-Intrinsic
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±0.24
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±0.27
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±0.30
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±0.33
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±0.37
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±0.42
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over 50
up to 500
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GTA 13/5
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Intrinsic
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±0.17
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±0.20
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±0.25
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±0.30
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±0.35
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±0.40
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±0.45
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±0.50
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±0.55
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±0.60
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Non-Intrinsic
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±0.32
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±0.35
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±0.40
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±0.45
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±0.50
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±0.55
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±0.60
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±0.65
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±0.70
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±0.75
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over 180
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GTA 14
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Intrinsic
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±0.22
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±0.26
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±0.31
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±0.37
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±0.44
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±0.50
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±0.60
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±0.65
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±0.70
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±0.80
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±0.90
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±1.00
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±1.20
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±1.30
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Non-Intrinsic
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±0.42
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±0.46
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±0.51
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±0.57
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±0.64
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±0.70
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±0.80
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±0.85
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±0.90
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±1.00
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±1.10
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±1.20
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±1.40
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±1.50
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over 500
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GTA 14/5
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Intrinsic
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±0.25
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±0.35
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±0.40
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±0.45
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±0.55
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±0.65
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±0.75
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±0.80
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±0.85
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±0.95
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±1.10
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±1.20
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±1.40
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±1.60
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Non-Intrinsic
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±0.55
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±0.65
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±0.70
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±0.75
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±0.85
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±0.95
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±0.95
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±1.10
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±1.10
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±1.20
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±1.40
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±1.50
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±1.70
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±1.90
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Intrinsic dimensions are those in the same parts of the tool.
Non-intrinsic dimensions are those created by the interaction of movable tool components, e.g. wall thickness and base thickness or dimensions affected by additives or extenders.
*Important: We assume no liability for quoted standards.
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Table 2. Tolerances of dimensions for wall thicknesses, ledges and ribs.
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TOLERANCES FOR
PRESSURE DIECASTING (DIN 1688)* CONTINUED
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Spatial
diagonal
area
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Degree of
exactitude
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Shape
dependency
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Nominal dimensional area
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up to
3
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over
3
up to
6
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over
6
up to
10
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up to 180
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GTA 13
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Intrinsic
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±0.15
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±0.20
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±0.20
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Non-Intrinsic
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±0.25
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±0.30
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±0.30
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over 50
up to 500
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GTA 13/5
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Intrinsic
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±0.20
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±0.25
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±0.30
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Non-Intrinsic
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±0.35
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±0.40
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±0.45
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over 180
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GTA 14
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Intrinsic
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±0.25
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±0.30
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±0.35
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Non-Intrinsic
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±0.45
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±0.50
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±0.55
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over 500
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GTA 14/5
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Intrinsic
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±0.30
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±0.40
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±0.45
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Non-Intrinsic
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±0.55
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±0.65
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±0.70
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Intrinsic dimensions are those in the same parts of the tool.
Non-intrinsic dimensions are those created by the interaction of movable tool components, e.g. wall thickness and base thickness or dimensions affected by additives or extenders.
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TOLERANCES FOR
CHILL CASTINGS
DIN (1688)*
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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.
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Table 1. Deviations in lengthwise dimensions (lengths, widths, heights, central distances, diameters, roundings).
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Degree of
accuracy
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Shape
dependency
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Nominal Dimension Area
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up to
18
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over
18
up to
30
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over
30
up to
50
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over
50
up to
80
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over
80
up to
120
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over
120
up to
180
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over
180
up to
250
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over
250
up to
315
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over
315
up to
400
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over
400
up to
500
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over
500
up to
630
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over
630
up to
800
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over
800
up to
1000
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over
1000
up to
1250
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GTA 15/5
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Intrinsic
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±0.45
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±0.50
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±0.60
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±0.75
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±0.85
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±1.00
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±1.20
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±1.30
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±1.40
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±1.60
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±1.70
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±2.00
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±2.30
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±2.60
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Non-Intrinsic
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±0.55
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±0.65
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±0.80
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±0.95
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±1.10
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±1.30
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±1.50
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±1.60
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±1.80
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±2.00
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±2.20
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±2.50
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±2.80
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±3.30
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Table 2. Deviations in thickness (wall thicknesses, ledges, ribs).
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Degree of
accuracy
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Shape
dependency
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Nominal Dimension Area
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up to
6
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over
6
up to
10
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over
10
up to
18
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GTA 15/5
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Intrinsic
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±0.60
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±1.20
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±1.80
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Non-Intrinsic
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±0.80
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±1.50
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±2.20
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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.
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TOLERANCES FOR
ALUMINUM
PROFILES
ACCORDING TO
DIN EN 12020-2*
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The tolerances for the nominal dimensions (see table 1) depend on the following ratios:
- diameter of the minimum circumscribing circle du divided by the minimum wall thickness
Smin.
- maximum wall thickness Smax divided by the minimum wall thickness Smin.
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Table 1. Tolerances for linear measurements
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ABPH 800 (Full Profile)
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Range of
dimensions
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Tolerances for a
ratio of du : Smin
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up to 40 : 1
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over 40 : 1
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and a ratio of
Smax : Smin
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over
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up to
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up to 6 : 1
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over 6 :
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-
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10
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±0.15
±0.20
±0.25
±0.30
±0.40
±0.45
±0.60
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10
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15
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15
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30
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30
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45
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45
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60
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60
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90
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90
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120
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120
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150
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±0.70
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±0.80
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150
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180
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±0.90
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±1.00
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180
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240
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±1.10
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±1.20
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240
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300
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±1.40
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±1.50
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Table 2. Tolerances for the wall thickness of full profiles
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ABPH 800 (Hollow Profile)
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Range of dimensions
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over
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up to
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Tolerances for
wall thickness
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-
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1.5
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±0.15
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1.5
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3
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±0.20
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3
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6
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±0.25
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6
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10
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±0.30
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10
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15
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±0.40
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15
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20
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±0.50
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20
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30
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±0.60
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30
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40
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±0.70
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ABPH 800 (Hollow Profile)
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Range of
dimensions
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Tolerances for the wall thickness
with a circumscribing circle du
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over 75
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over 130
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over 250
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over
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up to
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to 75
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to 130
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to 250
|
to 300
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-
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1.5
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±0.20
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±0.25
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-
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-
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1.5
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2
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±0.20
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±0.25
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±0.30
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-
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2
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3
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±0.25
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±0.30
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±0.35
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±0.40
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3
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6
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±0.35
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±0.40
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±0.50
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±0.60
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6
|
9
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±0.50
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±0.55
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±0.70
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±0.80
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9
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12
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±0.60
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±0.70
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±0.85
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±0.95
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12
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15
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±0.70
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±0.80
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±1.00
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±1.10
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15
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20
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-
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±1.00
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±1.20
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±1.30
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