EN Standards For Rolled Aluminium

The old BS1470 standard has been replaced by nine EN standards:

Differences Between BS & EN Standards

For those familiar with the old BS1470 it is useful to highlight where the new EN standards differ:

  • Chemical Compositions – No Change.
  • Alloy Numbering System – No Change.
  • Temper Designations for Heat Treatable Alloys – A new wider range of special tempers having up to four digits after the T have been introduced for non- standard applications (e.g. T6151).
  • Temper Designations for Non Heat Treatable Alloys – No change to existing tempers but a more comprehensive definition of how tempers are achieved.
  • Mechanical Properties – Similar but not identical. Also, 0.2% Proof Stress must now be quoted on test certificates.
  • Thickness Tolerances – Considerably tighter for alloys
  • 1050A & 3103. To reflect manufacturing difficulty the tolerances for alloys 5251, 5083 & 6082 are now wider than this, although still a little tighter than in BS1470.
  • Length and Width Tolerances – These tend to be tighter and are now all on the plus side (i.e. minus zero).
  • Flatness Tolerances – These are considerably tighter.

Alloy Groups

Please note that thickness tolerances for cold rolled material vary according to alloy, with the alloys falling into two groups as shown below.

Aluminium Alloy Groups

Alloy Group

Alloy Group I

1080A, 1070A, 1050A, 1200

3003, 3005, 3103, 3105

4006, 4007

5005, 5050

8011A

Alloy Group II

2014, 2017A, 2024

3004

5040, 5049, 8053, 5086, 5251, 5052, 5154A, 5454, 5754, 5182,

6061, 6082

7020, 7021, 7022, 7075

Thickness Tolerances

Please note that thickness tolerances for cold rolled material vary according to alloy, with the alloys falling into two groups as shown above.

The thickness tolerances also vary according to the width of the material as shown in the tables below.

Group I

Thickness (mm) Tolerance (mm) +/- Tolerance (mm) +/- Tolerance (mm) +/-

Group I 1000mm Wide

Group I 1250mm Wide

Group I 1500mm Wide

0.20 to 0.40

0.41 to 0.50

0.51 to 0.60

0.61 to 0.80

0.81 to 1.00

1.10 to 1.20

1.21 to 1.50

1.51 to 1.80

1.81 to 2.00

2.10 to 2.50

2.60 to 3.00

3.10 to 3.50

Cold Rolled Sheet & Strip - Group I

Thickness (mm) Tolerance (mm) +/- Tolerance (mm) +/- Tolerance (mm) +/-

Group I 1000mm Wide

Group I 1250mm Wide

Group I 1500mm Wide

0.20 to 0.40

0.02

0.04

0.05

0.41 to 0.50

0.03

0.04

0.05

0.51 to 0.60

0.03

0.05

0.06

0.61 to 0.80

0.03

0.06

0.07

0.81 to 10.0

0.04

0.06

0.08

1.10 to 1.20

0.04

0.07

0.09

1.21 to 1.50

0.05

0.09

0.10

1.51 to 1.80

0.06

0.10

0.11

1.80 to 2.00

0.06

0.11

0.12

2.00 to 2.50

0.07

0.12

0.13

2.60 to 3.00

0.08

0.13

0.15

3.10 to 3.50

0.10

0.15

0.17

Cold Rolled Sheet & Strip - Group II

Thickness (mm) Tolerance (mm) +/- Tolerance (mm) +/- Tolerance (mm) +/-

Group II 1000mm Wide

Group II 1250mm Wide

Group II 1500mm Wide

0.20 to 0.40

0.03

0.05

0.06

0.41 to 0.50

0.03

0.05

0.06

0.51 to 0.60

0.04

0.06

0.07

0.61 to 0.80

0.04

0.07

0.08

0.81 to 1.00

0.05

0.08

0.09

1.10 to 1.20

0.05

0.09

0.10

1.21 to 1.50

0.07

0.11

0.12

1.51 to 1.80

0.08

0.12

0.13

1.81 to 2.00

0.09

0.13

0.14

2.10 to 2.50

0.10

0.14

0.15

2.60 to 3.00

0.11

0.15

0.17

3.10 to 3.50

0.12

0.17

0.19

Cold Rolled Sheet & Strip - Group I/II

Thickness (mm) Tolerance (mm) +/- Tolerance (mm) +/- Tolerance (mm) +/-

Group I/II 1000mm Wide

Group I/II 1250mm Wide

Group I/II 1500mm Wide

3.60 to 4.00

0.15

0.20

0.22

4.10 to 5.00

0.18

0.22

0.24

5.10 to 6.00

0.20

0.24

0.25

6.10 to 8.00

0.24

0.30

0.31

8.10 to 10.0

0.27

0.33

0.36

10.1 to 12.0

0.32

0.38

0.40

12.1 to 15.0

0.36

0.42

0.43

15.1 to 20.0

0.38

0.44

0.46

21.0 to 25.0

0.40

0.46

0.48

26.0 to 30.0

0.45

0.50

0.53

31.0 to 40.0

0.50

0.55

0.58

41.0 to 50.0

0.55

0.60

0.63

Hot Rolled Plate

Thickness (mm) Tolerance (mm) +/- Tolerance (mm) +/-

1250mm Wide

1500mm Wide

2.50 to 4.00

0.28

0.28

4.10 to 5.00

0.30

0.30

5.10 to 6.00

0.32

0.32

6.10 to 8.00

0.35

0.40

8.10 to 10.0

0.45

0.50

10.1 to 15.0

0.50

0.60

15.1 to 20.0

0.60

0.70

21.0 to 30.0

0.65

0.75

31.0 to 40.0

0.75

0.85

41.0 to 50.0

0.90

1.00

51.0 to 60.0

1.10

1.20

61.0 to 80.0

1.40

1.50

81.0 to 100

1.70

1.80

101 to 150

2.10

2.20

151 to 220

2.50

2.60

221 to 350

2.80

2.90

351 to 400

3.50

3.70

Length Tolerances

Thickness (mm) Hot Rolled EN485-3 (-0mm) Plus: Cold Rolled EN 485-4 (-0mm) Plus:

0.20 to 0.30

8.0mm

6.0mm

3.00 to 6.00

8.0mm

8.0mm

6.00 to 12.0

8.0mm

10.0mm

12.0 to 50.0

9.0mm

-

Over 50.0

9.0mm

-

Applies to lengths 2001mm to 3000mm

Width Tolerances

Thickness (mm) Hot Rolled EN485-3 (-0mm) Plus: Cold Rolled EN 485-4 (-0mm) Plus:

0.20 to 0.30

-

3.0mm

3.10 to 6.00

7.0mm

4.0mm

6.10 to 12.0

7.0mm

5.0mm

12.1 to 50.0

8.0mm

-

51.0 to 200

8.0mm

-

201 to 400

11.0mm

-

Applies to widths 1001mm to 2000mm

Applies to widths 501mm to 1250mm

Flatness Tolerances


Product Thickness (mm) Max Deviation over 2500mm Length Max Deviation over 1250mm Width

Cold Rolled

0.50 to 3.00

10.0mm

5.00mm

3.00 to 6.00

7.50mm

3.75mm

Hot Rolled

6.00 to 200

5.00mm

2.50mm

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