EN Standards for Aluminium Extrusions

The old BS1474 - 1987 standard has been replaced by a number of EN standards of which the most important are:

Differences Between BS & EN Standards

For those familiar with the old BS1474 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.
  • Soft (O) temper is now classified H111 and an intermediate temper H112 is introduced.
  • For alloy 5251 tempers are now shown as H32/H34/H36/H38 (equivalent to H22/H24, etc). H19/H22 & H24 are now shown separately.

Notes:

Chemical Compositions: Please refer to the datasheet entitled Aluminium Specifications.

Mechanical Properties: Please refer to the datasheet entitled Aluminium Specifications.

For the purposes of tolerances, in the following tables the alloys are split into two groups:

  • Group I – 1000 series, 3000 series, 6000 series, 5005, 5051, 5251
  • Group II – 2000 series, 7000 series, 5052, 5154, 5454, 5754, 5083, 5086

Alloy Groups

Alloy Groups

Alloy Group I

1050, 1070, 1200, 1350

3003, 3102, 3103

5005, 5005A, 5051A, 5251

6101A, 6101B, 6005, 6005A, 6106, 6008, 6010A, 6012, 6014, 6018, 6023, 6351, 6060, 6360, 6061, 6261, 6262, 6262A, 6063, 6063A, 6463, 6065, 6081, 6082, 6182

Alloy Group II

2007, 2011, 2011A, 2014, 2014A, 2017A, 2024, 2030

5019, 5049, 5052, 5154A, 5454, 5754, 5083, 5086

7003, 7005, 7108, 7108A, 7020, 7021, 7022, 7049A, 7075

Diameter Tolerances

Round Bar

Diameter (mm) Tolerances (mm) +/- Tolerances (mm) +/-

Group I

Group II

10 to 18

0.22

0.30

19 to 25

0.25

0.35

26 to 40

0.30

0.40

41 to 50

0.35

0.45

51 to 65

0.40

0.50

66 to 80

0.45

0.70

81 to 100

0.55

0.90

101 to 120

0.65

1.00

121 to 150

0.80

1.20

151 to 180

1.00

1.40

181 to 220

1.15

1.70

221 to 270

1.30

2.00

271 to 320

1.60

2.50

Dimensional Tolerances

Square Bar

Width Across Flats (mm) Tolerances (mm) +/- Tolerances (mm) +/-

Group I

Group II

10 to 18

0.22

0.30

19 to 25

0.25

0.35

26 to 40

0.30

0.40

41 to 50

0.35

0.45

51 to 65

0.40

0.50

66 to 80

0.45

0.70

81 to 100

0.55

0.90

101 to 120

0.65

1.00

121 to 150

0.80

1.20

151 to 180

1.00

1.40

181 to 220

1.15

1.70

Hexagon Bar

Widths Across Flats (mm) Tolerances (mm) +/- Tolerances (mm) +/-

Group I

Group II

10 to 18

0.22

0.30

19 to 25

0.25

0.35

26 to 40

0.30

0.40

41 to 50

0.35

0.45

51 to 65

0.40

0.50

66 to 80

0.50

0.70

81 to 100

0.55

0.90

101 to 120

0.65

1.00

121 to 150

0.80

1.20

151 to 180

1.00

1.40

181 to 220

1.15

1.70

Rectangular Bar

Widths Across Flats (mm) Tolerances (mm) +/- Tolerances (mm) +/-

Group I

Group II

10 to 18

0.25

0.35

19 to 30

0.30

0.40

31 to 50

0.40

0.50

51 to 80

0.60

0.70

81 to 120

0.80

1.00

121 to 180

1.00

1.40

181 to 240

1.40

1.80

241 to 350

1.80

2.20

351 to 450

2.20

2.80

451 to 600

3.00

3.50

Squareness Tolerances

Rectangular Bar

Widths Across Flats (mm) Max Deviation from Square (mm)

2 to 10

0.10

11 to 100

0.01 x Width Across Flats

101 to 180

1.00

181 to 240

1.50

Square Bar

Width Across Flats (mm) Max Deviation from Square (mm)

10 to 100

0.01 x Width Across Flats

101 to 180

1.00

181 to 220

1.50

Max Corner Radii

Square Bar

Width Across Flats (mm) Tolerances (mm) +/- Tolerances (mm) +/-

Group I

Group I

Group II

10 to 25

1.00

1.50

26 to 50

1.50

2.00

51 to 80

2.00

3.00

81 to 120

2.50

3.00

121 to 180

2.50

4.00

180 to 220

3.50

5.00

Thickness Tolerances

Rectangular Bar - Group I

Widths Across Flats (mm) Tols (+/-) Tols (+/-) Tols (+/-) Tols (+/-) Tols (+/-) Tols (+/-) Tols (+/-) Tols (+/-) Tols (+/-)

2-6mm

6.1-10mm

10.1-18mm

19-30mm

31-50mm

51-80mm

81-120mm

121-180mm

181-240mm

10 to 18

0.20

0.25

0.25

-

-

-

-

-

-

19 to 30

0.20

0.25

0.30

0.30

-

-

-

-

-

31 to 50

0.25

0.25

0.30

0.35

0.40

-

-

-

-

51 to 80

0.25

0.30

0.35

0.40

0.50

0.60

-

-

-

81 to 120

0.30

0.35

0.40

0.45

0.60

0.70

0.80

-

-

121 to 180

0.40

0.45

0.50

0.55

0.60

0.70

0.90

1.00

-

181 to 240

-

0.55

0.60

0.65

0.70

0.80

1.00

1.20

1.40

241 to 350

-

0.65

0.70

0.75

0.80

0.90

1.10

1.30

1.50

351 to 450

-

-

0.80

0.85

0.90

1.00

1.20

1.40

1.60

451 to 600

-

-

-

-

0.90

1.00

1.40

-

-

Rectangular Bar - Group II

Widths Across Flats (mm) Tols (+/-) Tols (+/-) Tols (+/-) Tols (+/-) Tols (+/-) Tols (+/-) Tols (+/-) Tols (+/-) Tols (+/-)

2-6mm

6.1-10mm

10.1-18mm

19-30mm

31-50mm

51-80mm

81-120mm

121-180mm

181-240mm

10 to 18

0.25

0.30

0.35

-

-

-

-

-

-

19 to 30

0.25

0.30

0.40

0.40

-

-

-

-

-

31 to 50

0.30

0.30

0.40

0.50

0.50

-

-

-

-

51 to 80

0.30

0.35

0.45

0.60

0.70

0.70

-

-

-

81 to 120

0.35

0.40

0.50

0.60

0.70

0.80

1.00

-

-

121 to 180

0.45

0.50

0.55

0.70

0.80

1.00

1.10

1.40

-

181 to 240

-

0.60

0.65

0.70

0.90

1.10

1.30

1.60

1.80

241 to 350

-

0.70

0.75

0.80

0.90

1.20

1.40

1.70

1.90

351 to 450

-

-

0.90

1.00

1.10

1.40

1.80

2.10

2.30

451 to 600

-

-

-

-

1.20

1.40

1.80

-

-

Seamless & Porthole Round Tube

Diameter Tolerances

Diameter (mm) OD or ID Max Deviation of Mean Diameter Max Deviation at Any Point mm Max Deviation at Any Point mm Max Deviation at Any Point mm

mm (+/-)

Not Annealed or Heat Treated

Heat Treated

Annealed

8 to 18

0.25

0.40

0.60

1.50

19 to 30

0.30

0.50

0.70

1.80

31 to 50

0.35

0.60

0.90

2.20

51 to 80

0.40

0.70

1.10

2.60

81 to 120

0.60

0.90

1.40

3.60

121 to 200

0.90

1.40

2.00

5.00

201 to 350

1.40

1.90

3.00

7.60

351 to 450

1.90

2.80

4.00

10.0

Wall Thickness Tolerances - Seamless Round Tube

Wall Thickness (mm) Tolerance Measured at Any Point (+/- %)

0.5 to 3.0

10

3.0 to 5.0

9

Over 5.0

8

Wall Thickness Tolerances - Porthole Round Tube

Wall Thickness (mm) Tolerance Measured at Any Point (+/- %)

3.0

7

3.0 to 5.0

6

Over 5.0

5

Tolerance - Width, Depth or Width A/F For Seamless & Porthole Tube

Width, Depth or Width A/F Ovality Tolerances (+/- mm) Ovality Tolerances (+/- mm) Ovality Tolerances (+/- mm) Ovality Tolerances (+/- mm) Ovality Tolerances (+/- mm) Ovality Tolerances (+/- mm) Ovality Tolerances (+/- mm) Ovality Tolerances (+/- mm)

Group I 0-100

Group I 101-200

Group I 201-300

Group 1 301-350

Group II 1-100

Group II 101-200

Group II 201-300

Group II 301-350

Up to 10

0.25

0.30

0.35

0.40

0.40

0.50

0.55

0.60

11 to 25

0.30

0.40

0.50

0.60

0.50

0.70

0.80

0.90

26 to 50

0.50

0.60

0.80

0.90

0.80

0.90

1.00

1.20

51 to 100

0.70

0.90

1.10

1.30

1.00

1.20

1.30

1.60

101 to 150

-

1.10

1.30

1.50

-

1.50

1.70

1.80

151 to 200

-

1.30

1.50

1.80

-

1.90

2.20

2.40

201 to 300

-

-

1.70

2.10

-

-

2.50

2.80

301 to 350

-

-

-

2.80

-

-

-

3.50

Tolerances on Wall Thickness for Seamless Tube (Other Than Round Tube)

Wall Thickness (mm) Tolerances (+/- mm) for Given Circumscribing Circle Tolerances (+/- mm) for Given Circumscribing Circle Tolerances (+/- mm) for Given Circumscribing Circle Tolerances (+/- mm) for Given Circumscribing Circle Tolerances (+/- mm) for Given Circumscribing Circle Tolerances (+/- mm) for Given Circumscribing Circle

Group I Up to 100

Group I 101 to 300

Group I 301 to 350

Group II Up to 100

Group II 101 to 300

Group II 301 to 350

0.5 to 1.5

0.25

0.35

-

0.35

0.50

-

1.51 to 3.0

0.30

0.50

0.75

0.45

0.65

0.90

3.1 to 6.0

0.50

0.75

1.00

0.60

0.90

1.20

6.1 to 10.0

0.75

1.00

1.20

1.00

1.30

1.50

11 to 15

1.00

1.20

1.50

1.30

1.70

1.90

16 to 20

1.50

1.90

2.00

1.90

2.20

2.50

21 to 30

1.90

2.20

2.50

2.20

2.70

3.10

31 to 40

-

2.50

2.70

-

-

-

Tolerances on Wall Thickness for Porthole Tube (Other Than Round Tube)

Tolerances (+/- mm) for Given Circumscribing Circle Tolerances (+/- mm) for Given Circumscribing Circle Tolerances (+/- mm) for Given Circumscribing Circle Tolerances (+/- mm) for Given Circumscribing Circle Tolerances (+/- mm) for Given Circumscribing Circle Tolerances (+/- mm) for Given Circumscribing Circle

Group I Up to 100

Group I 101 to 300

Group I 300 to 350

Group II Up to 100

Group II 101 to 300

Group II 300 to 350

0.5 to 1.5

0.20

0.30

-

0.30

0.40

-

1.51 to 3.0

0.25

0.40

0.60

0.35

0.50

0.70

3.1 to 6.0

0.40

0.60

0.80

0.55

0.70

0.90

6.1 to 10.0

0.60

0.80

1.00

0.75

1.00

1.20

11 to 15

0.80

1.00

1.20

1.00

1.30

1.50

16 to 20

1.20

1.50

1.70

1.50

1.80

2.00

21 to 30

1.50

1.80

2.00

1.80

2.20

2.50

31 to 40

-

2.00

2.00

-

2.50

3.00

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