Aluminium Alloy
|
General Information
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The old BS1474 - 1987 standard has been replaced by a number of EN standards of which the most important are:
EN754 - Cold drawn rod, bar & tube
EN755 - Hot extruded products
EN12020 - Extruded precision profiles in alloys 6060 & 6063
EN515 - Temper Designations
EN573-1: Numerical alloy designation system
EN573-2: Chemical symbol designation system
EN573-3: Chemical Compositions
EN573-4: Product forms in different alloys
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.
Chemical Compositions
Please refer to the datasheet entitled Aluminium Specifications.
Mechanical Properties
Please refer to the datasheet entitled Aluminium Specifications.
Note that for the purposes of tolerances 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 Group I
|
|
1050, 1070, 1200, 1350, 3102, 3003, 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
|
|
8 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
|
1.0
|
|
121 to 150
|
0.80
|
1.2
|
|
151 to 180
|
1.0
|
1.4
|
|
181 to 220
|
1.15
|
1.7
|
|
221 to 270
|
1.3
|
2.0
|
|
271 to 320
|
1.6
|
2.5
|
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
|
1.0
|
|
121 to 150
|
0.80
|
1.2
|
|
151 to 180
|
1.0
|
1.4
|
|
181 to 220
|
1.15
|
1.7
|
Dimensional Tolerances - Hexagon 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
|
0.50
|
0.70
|
|
81 to 100
|
0.55
|
0.90
|
|
101 to 120
|
0.65
|
1.0
|
|
121 to 150
|
0.80
|
1.2
|
|
151 to 180
|
1.0
|
1.4
|
|
181 to 220
|
1.15
|
1.7
|
Width Tolerance - Rectangular Bars
|
Width 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
|
1.0
|
|
121 to 180
|
1.0
|
1.4
|
|
181 to 240
|
1.4
|
1.8
|
|
241 to 350
|
1.8
|
2.2
|
|
351 to 450
|
2.2
|
2.8
|
|
451 to 600
|
3.0
|
3.5
|
Squareness Tolerances - Rectangular Bar
|
Width Across Flats (mm)
|
Max Deviation from Square (mm)
|
|
2 to 10
|
0.1
|
|
11 to 100
|
0.01 x Width Across Flats
|
|
101 to 180
|
1.0
|
|
181 to 240
|
1.5
|
Squareness Tolerances - Square Bars
|
Width Across Flats (mm)
|
Max Deviation from Square (mm)
|
|
10 to 100
|
0.01 x Width across Flats
|
|
101 to 180
|
1.0
|
|
181 to 220
|
1.5
|
Max Corner Radii - Square Bars
|
Width Across Flats (mm)
|
Tolerances mm (+/-)
|
Tolerances mm (+/-)
|
|
|
Group I
|
Group II
|
|
10 to 25
|
1.0
|
1.5
|
|
26 to 50
|
1.5
|
2.0
|
|
51 to 80
|
2.0
|
3.0
|
|
81 to 120
|
2.5
|
3.0
|
|
121 to 180
|
2.5
|
4.0
|
|
181 to 220
|
3.5
|
5.0
|
Thickness Tolerances for Rectangular Bar - Group I
|
Width Across Flats (mm)
|
Tols +/-
|
Tols +/-
|
Tols +/-
|
Tols +/-
|
Tols +/-
|
|
|
2-6mm
|
6.1 - 10mm
|
10.1-18mm
|
19-30mm
|
31-50mm
|
|
10 to 18
|
0.20
|
0.25
|
0.25
|
-
|
-
|
|
19 to 30
|
0.20
|
0.25
|
0.30
|
0.3
|
-
|
|
31 to 50
|
0.25
|
0.25
|
0.30
|
0.35
|
0.4
|
|
51 to 80
|
0.25
|
0.30
|
0.35
|
0.40
|
0.5
|
|
81 to 120
|
0.30
|
0.35
|
0.40
|
0.45
|
0.6
|
|
121 to 180
|
0.40
|
0.45
|
0.50
|
0.55
|
0.6
|
|
181 to 240
|
-
|
0.55
|
0.60
|
0.65
|
0.7
|
|
241 to 350
|
-
|
0.65
|
0.70
|
0.75
|
0.8
|
|
351 to 450
|
-
|
-
|
0.80
|
0.85
|
0.9
|
|
451 to 600
|
-
|
-
|
-
|
-
|
0.9
|
Thickness Tolerances for Rectangular Bar - Group I
|
Width Across Flats (mm)
|
Tols +/-
|
Tols +/-
|
Tols +/-
|
Tols +/-
|
|
|
51-80mm
|
81-120mm
|
121-180mm
|
181-240mm
|
|
10 to 18
|
-
|
-
|
-
|
-
|
|
19 to 30
|
-
|
-
|
-
|
-
|
|
31 to 50
|
-
|
-
|
-
|
-
|
|
51 to 80
|
0.6
|
-
|
-
|
-
|
|
81 to 120
|
0.7
|
0.8
|
-
|
-
|
|
121 to 180
|
0.7
|
0.9
|
1.0
|
-
|
|
181 to 240
|
0.8
|
1.0
|
1.2
|
1.4
|
|
241 to 350
|
0.9
|
1.1
|
1.3
|
1.5
|
|
351 to 450
|
1.0
|
1.2
|
1.4
|
1.6
|
|
451 to 600
|
1.0
|
1.4
|
-
|
-
|
Thickness Tolerances for Rectangular Bar-Group II
|
Width Across Flats (mm)
|
Tols +/-
|
Tols +/-
|
Tols +/-
|
Tols +/-
|
Tols +/-
|
|
|
2-6mm
|
6.1-10mm
|
10.1-18mm
|
19-30mm
|
31-50mm
|
|
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
|
0.5
|
0.5
|
|
51 to 80
|
0.30
|
0.35
|
0.45
|
0.6
|
0.7
|
|
81 to 120
|
0.35
|
0.40
|
0.5
|
0.6
|
0.7
|
|
121 to 180
|
0.45
|
0.50
|
0.55
|
0.7
|
0.8
|
|
181 to 240
|
-
|
0.60
|
0.65
|
0.7
|
0.9
|
|
241 to 350
|
-
|
0.70
|
0.75
|
0.8
|
0.9
|
|
351 to 450
|
-
|
-
|
0.9
|
1.0
|
1.1
|
|
451 to 600
|
-
|
-
|
-
|
-
|
1.2
|
Thickness Tolerances for Rectangular Bar-Group II
|
Width Across Flats (mm)
|
Tols +/-
|
Tols +/-
|
Tols +/-
|
Tols +/-
|
|
|
51-80mm
|
81-120mm
|
121-180mm
|
181-240mm
|
|
10 to18
|
-
|
-
|
-
|
-
|
|
19 to 30
|
-
|
-
|
-
|
-
|
|
31 to 50
|
-
|
-
|
-
|
-
|
|
51 to 80
|
0.7
|
-
|
-
|
-
|
|
81 to 120
|
0.8
|
1.0
|
-
|
-
|
|
121 to 180
|
1.0
|
1.1
|
1.4
|
-
|
|
181 to 240
|
1.1
|
1.3
|
1.6
|
1.8
|
|
241 to 350
|
1.2
|
1.4
|
1.7
|
1.9
|
|
351 to 450
|
1.4
|
1.8
|
2.1
|
2.3
|
|
451 to 600
|
1.4
|
1.8
|
-
|
-
|
Diameter Tolerances for Smls & Porthole Round Tube
|
Diam. (mm) OD or ID
|
Max Deviation of Mean Diam.
|
Max Dev. at Any Point mm
|
Max Dev. at Any Point mm
|
Max Dev. at Any Point mm
|
|
|
mm (+/-)
|
Not Annealed or Heat Treated
|
Heat-Treated
|
Annealed
|
|
8 to 18
|
0.25
|
0.4
|
0.6
|
1.5
|
|
19 to 30
|
0.30
|
0.5
|
0.7
|
1.8
|
|
31 to 50
|
0.35
|
0.6
|
0.9
|
2.2
|
|
51 to 80
|
0.40
|
0.7
|
1.1
|
2.6
|
|
81 to 120
|
0.60
|
0.9
|
1.4
|
3.6
|
|
121 to 200
|
0.90
|
1.4
|
2.0
|
5.0
|
|
201 to 350
|
1.4
|
1.9
|
3.0
|
7.6
|
|
351 to 450
|
1.9
|
2.8
|
4.0
|
10.0
|
Wall Thickness Tols for 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
|
Tol - Width,Depth,Width A/F for Smls & P/Hole Tube
|
Width, Depth or Width A/F
|
Ovality Tols (+/-mm)
|
Ovality Tols (+/-mm)
|
Ovality Tols (+/-mm)
|
Ovality Tols (+/-mm)
|
|
|
Group I 0 to 100mm
|
Group I 101 to 200
|
Group I 201 to 300
|
Group I 301 to 350
|
|
Up to 10
|
0.25
|
0.30
|
0.35
|
0.40
|
|
11 to 25
|
0.30
|
0.40
|
0.50
|
0.60
|
|
26 to 50
|
0.50
|
0.60
|
0.80
|
0.90
|
|
51 to 100
|
0.70
|
0.90
|
1.10
|
1.30
|
|
101 to 150
|
-
|
1.10
|
1.30
|
1.50
|
|
151 to 200
|
-
|
1.30
|
1.50
|
1.80
|
|
201 to 300
|
-
|
-
|
1.70
|
2.10
|
|
301 to 350
|
-
|
-
|
-
|
2.80
|
Tol - Width,Depth,Width A/F for Smls & P/Hole Tube
|
Width, Depth or Width A/F
|
Ovality Tols (+/-mm
|
Ovality Tols (+/-mm
|
Ovality Tols (+/-mm
|
Ovality Tols (+/-mm
|
|
|
Group II 0 to 100mm
|
Group II 101 to 200mm
|
Group II 201 to 300mm
|
Group II 301 to 350mm
|
|
Up to 10
|
0.40
|
0.50
|
0.55
|
0.60
|
|
11 to 25
|
0.50
|
0.70
|
0.80
|
0.90
|
|
26 to 50
|
0.80
|
0.90
|
1.0
|
1.20
|
|
51 to 100
|
1.0
|
1.20
|
1.30
|
1.60
|
|
101 to 150
|
-
|
1.50
|
1.70
|
1.80
|
|
151 to 200
|
-
|
1.90
|
2.20
|
2.40
|
|
201 to 300
|
-
|
-
|
2.50
|
2.80
|
|
301 to 350
|
-
|
-
|
-
|
3.50
|
Tols on WT for SMLS Tube - other than Round Tube
|
Wall Thickness (mm)
|
Tols (+/-mm) for given Circumscribing Circle
|
Tols (+/-mm) for given Circumscribing Circle
|
Tols (+/-mm) for given Circumscribing Circle
|
|
|
Up to 100mm Group I
|
101 to 300mm Group I
|
301 to 350mm Group I
|
|
0.5 to 1.5
|
0.25
|
0.35
|
-
|
|
1.51 to 3.0
|
0.30
|
0.50
|
0.75
|
|
3.1 to 6.0
|
0.50
|
0.75
|
1.0
|
|
6.1 to 10
|
0.75
|
1.0
|
1.2
|
|
11 to 15
|
1.0
|
1.2
|
1.5
|
|
16 to 20
|
1.5
|
1.9
|
2.0
|
|
31 to 30
|
1.9
|
2.2
|
2.5
|
|
31 to 40
|
-
|
2.5
|
2.7
|
Tols on WT for SMLS Tube - other than Round Tube
|
Wall Thickness (mm)
|
Tols (+/-mm) for given Circumscribing Circle
|
Tols (+/-mm) for given Circumscribing Circle
|
Tols (+/-mm) for given Circumscribing Circle
|
|
|
Up to 100mm Group II
|
101 to 300mm Group II
|
301 to 350mm Group II
|
|
0.5 to 1.5
|
0.35
|
0.50
|
-
|
|
1.51 to 3.0
|
0.45
|
0.65
|
0.9
|
|
3.1 to 6.0
|
0.60
|
0.90
|
1.2
|
|
6.1 to 10
|
1.0
|
1.3
|
1.5
|
|
11 to 15
|
1.3
|
1.7
|
1.9
|
|
16 to 20
|
1.9
|
2.2
|
2.5
|
|
21 to 30
|
2.2
|
2.7
|
3.1
|
|
31 to 40
|
-
|
-
|
-
|
Wall Thickness Tolerances for Porthole Round Tube
|
Wall Thickness (mm)
|
Tolerance Measured at Any Point (+/- %)
|
|
3.0
|
7
|
|
3.0 to 5.0
|
6
|
|
Over 5.0
|
5
|
Tols on WT for P/hole Tube - Other Than Round Tube
|
Wall Thickness (mm)
|
Tols (+/-mm) for given Circumscribing Circle
|
Tols (+/-mm) for given Circumscribing Circle
|
Tols (+/-mm) for given Circumscribing Circle
|
|
|
Up to 100mm Group I
|
101 to 300mm Group I
|
301 to 350mm Group I
|
|
0.5 to 1.5
|
0.20
|
0.30
|
-
|
|
1.51 to 3.0
|
0.25
|
0.40
|
0.60
|
|
3.1 to 6.0
|
0.40
|
0.60
|
0.80
|
|
6.1 to 10.0
|
0.60
|
0.80
|
1.0
|
|
11 to 15
|
0.80
|
1.0
|
1.2
|
|
16 to 20
|
1.2
|
1.5
|
1.7
|
|
21 to 30
|
1.5
|
1.8
|
2.0
|
|
31 to 40
|
-
|
2.0
|
2.0
|
Tols on WT for P/hole Tube - Other Than Round Tube
|
Wall Thickness (mm)
|
Tols (+/-mm) for given Circumscribing Circle
|
Tols (+/-mm) for given Circumscribing Circle
|
Tols (+/-mm) for given Circumscribing Circle
|
|
|
Up to 100mm Group II
|
101 to 300mm Group II
|
301 to 350mm Group II
|
|
0.5 to 1.5
|
0.30
|
0.40
|
-
|
|
1.51 to 3.0
|
0.35
|
0.50
|
0.70
|
|
3.1 to 6.0
|
0.55
|
0.70
|
0.90
|
|
6.1 to 10
|
0.75
|
1.0
|
1.2
|
|
11 to 15
|
1.0
|
1.3
|
1.5
|
|
16 to 20
|
1.5
|
1.8
|
2.0
|
|
21 to 30
|
1.8
|
2.2
|
2.5
|
|
31 to 40
|
-
|
2.5
|
3.0
|
