EN Standards for Aluminium Extrusions

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

EN Standards for Aluminium Extrusions

Differences Between BS & EN Standards

Alloy Groups

Diameter Tolerances

Round Bar

Dimensional Tolerances

Square Bar

Hexagon Bar

Rectangular Bar

Squareness Tolerances

Rectangular Bar

Square Bar

Max Corner Radii

Square Bar

Thickness Tolerances

Rectangular Bar - Group I

Rectangular Bar - Group II

Seamless & Porthole Round Tube

Diameter Tolerances

Wall Thickness Tolerances - Seamless Round Tube

Wall Thickness Tolerances - Porthole Round Tube

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

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

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

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