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Aluminum Tolerances


TOLERANCES FOR
PRESSURE DIECASTINGS
(DIN 1688*)
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
 
Table 1. Tolerances of dimensions for lengths, widths, heights, central distances, diameters and roundings.
Spatial
diagonal
area
Degree of
exactitude
Shape
dependency

Nominal Dimension Area

up to
18
over
18
up to
30
over
30
up to
50
over
50
up to
80
over
80
up to
120
over
120
up to
180
over
180
up to
250
over
250
up to
315
over
315
up to
400
over
400
up to
500
over
500
up to
630
over
630
up to
800
over
800
up to
1000
over
1000
up to
1250
over 180 GTA 13 Intrinsic ±0.14 ±0.17 ±0.20 ±0.23 ±0.27 ±0.32                
Non-Intrinsic ±0.24 ±0.27 ±0.30 ±0.33 ±0.37 ±0.42                
over 50
up to 500
GTA 13/5 Intrinsic ±0.17 ±0.20 ±0.25 ±0.30 ±0.35 ±0.40 ±0.45 ±0.50 ±0.55 ±0.60        
Non-Intrinsic ±0.32 ±0.35 ±0.40 ±0.45 ±0.50 ±0.55 ±0.60 ±0.65 ±0.70 ±0.75        
over 180 GTA 14 Intrinsic ±0.22 ±0.26 ±0.31 ±0.37 ±0.44 ±0.50 ±0.60 ±0.65 ±0.70 ±0.80 ±0.90 ±1.00 ±1.20 ±1.30
Non-Intrinsic ±0.42 ±0.46 ±0.51 ±0.57 ±0.64 ±0.70 ±0.80 ±0.85 ±0.90 ±1.00 ±1.10 ±1.20 ±1.40 ±1.50
over 500 GTA 14/5 Intrinsic ±0.25 ±0.35 ±0.40 ±0.45 ±0.55 ±0.65 ±0.75 ±0.80 ±0.85 ±0.95 ±1.10 ±1.20 ±1.40 ±1.60
Non-Intrinsic ±0.55 ±0.65 ±0.70 ±0.75 ±0.85 ±0.95 ±0.95 ±1.10 ±1.10 ±1.20 ±1.40 ±1.50 ±1.70 ±1.90

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.
 

Table 2. Tolerances of dimensions for wall thicknesses, ledges and ribs.

Spatial
diagonal
area
Degree of
exactitude
Shape
dependency

Nominal dimensional area

up to 3 over 3
up to 6
over 6
up to 10
up to 180 GTA 13 Intrinsic ±0.15 ±0.20 ±0.20
Non-Intrinsic ±0.25 ±0.30 ±0.30
over 50
up to 500
GTA 13/5 Intrinsic ±0.20 ±0.25 ±0.30
Non-Intrinsic ±0.35 ±0.40 ±0.45
over 180 GTA 14 Intrinsic ±0.25 ±0.30 ±0.35
Non-Intrinsic ±0.45 ±0.50 ±0.55
over 500 GTA 14/5 Intrinsic ±0.30 ±0.40 ±0.45
Non-Intrinsic ±0.55 ±0.65 ±0.70
  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.
 

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
Shape
dependency

Nominal Dimension Area

up to 
18
over
18
up to
30
over
30
up to
50
over
50
up to
80
over
80
up to
120
over
120
up to
180
over
180
up to
250
over
250
up to
315
over
315
up to
400
over
400
up to
500
over
500
up to
630
over
630
up to
800
over
800
up to
1000
over
1000
up to
1250
GTA 15/5 Intrinsic ±0.45 ±0.50 ±0.60 ±0.75 ±0.85 ±1.00 ±1.20 ±1.30 ±1.40 ±1.60 ±1.70 ±2.00 ±2.30 ±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).
Degree of
accuracy
Shape
dependency

Nominal Dimension Area

up to 6 over 6
up to 10
over 10
up to 18
GTA 15/5 Intrinsic ±0.60 ±1.20 ±1.80
Non-Intrinsic ±0.80 ±1.50 ±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.
 

TOLERANCES FOR
ALUMINUM PROFILES
ACCORDING TO
DIN EN 12020-2*
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.


 

   Table 1. Tolerances for linear measurements

Range of
dimensions

Tolerances for a
ratio of du : Smin

up to 40 : 1 over 40 : 1

and a ratio of
Smax : Smin

over up to up to 6 : 1 over 6 :
- 10 ±0.15
±0.20
±0.25
±0.30
±0.40
±0.45
±0.60
10 15
15 30
30 45
45 60
60 90
90 120
120 150 ±0.70 ±0.80
150 180 ±0.90 ±1.00
180 240 ±1.10 ±1.20
240 300 ±1.40 ±1.50
   


ABP 800 (Full Profile)

   Table 2. Tolerances for the wall thickness of full profiles

Range of dimensions

Tolerances

over up to Tolerances for
wall thickness
- 1.5 ±0.15
1.5 3 ±0.20
3 6 ±0.25
6 10 ±0.30
10 15 ±0.40
15 20 ±0.50
20 30 ±0.60
30 40 ±0.70
 


ABPH 800 (Hollow Profile)

   Table 3. Tolerances for the wall thickness of hollow profiles

Range of
dimensions

Tolerances for the wall thickness
with a circumscribing circle du

  over 75 over 130 over 250
over up to to 75 to 130 to 250 to 300
- 1.5 ±0.20 ±0.25 - -
1.5 2 ±0.20 ±0.25 ±0.30 -
2 3 ±0.25 ±0.30 ±0.35 ±0.40
3 6 ±0.35 ±0.40 ±0.50 ±0.60
6 9 ±0.50 ±0.55 ±0.70 ±0.80
9 12 ±0.60 ±0.70 ±0.85 ±0.95
12 15 ±0.70 ±0.80 ±1.00 ±1.10
15 20 - ±1.00 ±1.20 ±1.30

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