BRITISH STANDARD |

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755-7:1998
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Aluminium and aluminium |
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alloys Ð Extruded rod/bar, |
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tube and profiles Ð |
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Part 7: Seamless tubes, tolerances on |
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dimensions and form |
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The European Standard EN 755-7:1998 has the status of a |
British Standard |
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ICS 23.040.15; 77.150.10 |
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NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW
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 BS EN 755-7:1998
Licensed Copy: Brighton ATHENS, The University of Brighton, 04/03/2009 13:25, Uncontrolled Copy, (c) BSI

National foreword
This British Standard is the English language version of EN 755-7:1998.
This part of BS EN 755 is published together with:
BS EN 755, Aluminium and aluminium alloys Ð Extruded rod/bar, tube and profiles Ð
Part 8: Porthole tubes, tolerances on dimensions and form.
BS EN 754, Aluminium and aluminium alloys Ð Cold drawn rod/bar and tube Ð Part 7: Seamless
tubes, tolerances on dimensions and form.
BS EN 754, Aluminium and aluminium alloys Ð Cold drawn rod/bar and tube Ð Part 8: Porthole
tubes, tolerances on dimensions and form.

NOTE The table gives the full list of published European Standards which partially supersede the
British Standards.

British Standards partially superseded by this standard and other European Standards
BS 1474:1987 BS 4300-4:1973 BS 4300-12:1969 BS 4300-15:1973
EN 515 EN 515 EN 515 EN 515
EN 573-3 EN 573-3 EN 573-3 EN 573-3
EN 573-4 EN 573-4 EN 573-4 EN 573-4
EN 755-1 EN 755-1 EN 755-1 EN 755-1
EN 755-2 EN 755-2 EN 755-2 EN 755-2
EN 755-3 EN 755-3 EN 755-3 EN 755-3
EN 755-4 EN 755-4 EN 755-4 EN 755-4
EN 755-5 EN 755-5 EN 755-5 EN 755-5
EN 755-6 EN 755-6 EN 755-6 EN 755-6
EN 755-7 EN 755-7 EN 755-7
EN 755-8 EN 755-8 EN 755-8

In addition, the British Standards in the table will be withdrawn when the following European
Standards are published:
EN 755, Aluminium and aluminium alloys Ð Extruded rod/bar, tube and profiles Ð
Part 9: Profiles, tolerances on dimensions and form.
EN 12020, Aluminium and aluminium alloys Ð Extruded precision profiles in alloys
EN AW 6060/EN AW 6063 Ð Part 1: Technical conditions for inspection and delivery.
EN 12020, Aluminium and aluminium alloys Ð Extruded precision profiles in alloys
EN AW 6060/EN AW 6063 Ð Part 2: Tolerances on dimensions and form.
The UK participation in its preparation was entrusted by Technical Committee NFE/35, Light metals
and their alloys, to Subcommittee NFE/35/5, Wrought aluminium and aluminium alloys, which has the
responsibility to:

Ð aid enquirers to understand the text;

Ð present to the responsible European committee any enquiries on the interpretation, or
proposals for change, and keep the UK interests informed;
Ð monitor related international and European developments and promulgate them in the UK.

A list of organizations represented on this subcommittee can be obtained on request to its secretary.
Cross-references
The British Standards which implement international or European publications referred to in this
document may be found in the BSI Standards Catalogue under the section entitled ªInternational
Standards Correspondence Indexº, or by using the ªFindº facility of the BSI Standards Electronic
Catalogue.
A British Standard does not purport to include all the necessary provisions of a contract. Users of
British Standards are responsible for their correct application.
This British Standard, having
been prepared under the Compliance with a British Standard does not of itself confer immunity from legal
direction of the Engineering obligations.
Sector Committee, was published Summary of pages
under the authority of the
Standards Committee and comes This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 10, an
into effect on 15 December 1998 inside back cover and a back cover.

Amendments issued since publication

 BSI 1998
Amd. No. Date Text affected

ISBN 0 580 30340 3

 EUROPEAN STANDARD EN 755-7
Licensed Copy: Brighton ATHENS, The University of Brighton, 04/03/2009 13:25, Uncontrolled Copy, (c) BSI

NORME EUROPEÂENNE
EUROPAÈISCHE NORM July 1998

ICS 77.150.10

Descriptors: aluminium, aluminium alloys, extruded products, aluminium tubes, tolerances on dimension, tolerances on form

English version

Aluminium and aluminium alloys Ð Extruded rod/bar,

tube and profiles Ð Part 7: Seamless tubes, tolerances
on dimensions and form

Aluminium et alliages d'aluminium Ð Aluminium und Aluminiumlegierungen Ð

Barres, tubes et profieÂs fileÂs Ð Stranggepreûte Stangen, Rohre und Profile Ð
Partie 7: Tubes fileÂs sur aiguille, toleÂrances sur Teil 7: Nahtlose Rohre, Grenzabmaûe und
dimensions et forme Formtoleranzen

This European Standard was approved by CEN on 1 July 1998.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations
which stipulate the conditions for giving this European Standard the status of a
national standard without any alteration. Up-to-date lists and bibliographical
references concerning such national standards may be obtained on application to
the Central Secretariat or to any CEN member.
This European Standard exists in three official versions (English, French, German).
A version in any other language made by translation under the responsibility of a
CEN member into its own language and notified to the Central Secretariat has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy,
Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and
United Kingdom.

CEN
European Committee for Standardization
Comite EuropeÂen de Normalisation
EuropaÈisches Komitee fuÈr Normung

Central Secretariat: rue de Stassart 36, B-1050 Brussels

 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national
Members.
Ref. No. EN 755-7:1998 E
 Page 2
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EN 755-7:1998

Foreword Contents
This European Standard has been prepared by Page
Technical Committee CEN/TC 132, Aluminium and
aluminium alloys, the Secretariat of which is held by Foreword 2
AFNOR. 1 Scope 3
This European Standard shall be given the status of a 2 Alloy groups 3
national standard, either by publication of an identical 3 Tolerances on dimensions 3
text or by endorsement, at the latest by January 1999,
and conflicting national standards shall be withdrawn 3.1 General 3
at the latest by January 1999. 3.2 Diameter Ð round tube 3
According to the CEN/CENELEC Internal Regulations, 3.3 Width, depth or width across flats Ð
the national standards organizations of the following squares, rectangles, hexagons,
countries are bound to implement this European octagons 3
Standard: Austria, Belgium, Czech Republic, Denmark,
3.4 Wall thickness 3
Finland, France, Germany, Greece, Iceland, Ireland,
Italy, Luxembourg, Netherlands, Norway, Portugal, 3.5 Length 5
Spain, Sweden, Switzerland and the United Kingdom. 3.6 Squareness of cut ends 6
Within its programme of work, Technical Committee 4 Tolerances on form 6
CEN/TC 132 entrusted CEN/TC 132/WG 5, Extruded and
drawn products, to prepare the following standard: 4.1 General 6
EN 755-7, Aluminium and aluminium alloys Ð 4.2 Straightness 6
Extruded rod/bar, tube and profiles Ð Part 7: 4.3 Convexity±concavity 7
Seamless tubes, tolerances on dimensions and form.
4.4 Twist 7
This standard is part of a series of nine standards.
The other standards deal with: 4.5 Angularity 9
EN 755-1, Aluminium and aluminium alloys Ð 4.6 Corner and fillet radii 10
Extruded rod/bar, tube and profiles Ð 4.7 Depth of dents for round tube 10
Part 1: Technical conditions for inspection
and delivery.
EN 755-2, Aluminium and aluminium alloys Ð
Extruded rod/bar, tube and profiles Ð
Part 2: Mechanical properties.
EN 755-3, Aluminium and aluminium alloys Ð
Extruded rod/bar, tube and profiles Ð
Part 3: Round bars, tolerances on dimensions
and form.
EN 755-4, Aluminium and aluminium alloys Ð
Extruded rod/bar, tube and profiles Ð
Part 4: Square bars, tolerances on dimensions
and form.
EN 755-5, Aluminium and aluminium alloys Ð
Extruded rod/bar, tube and profiles Ð
Part 5: Rectangular bars, tolerances on
dimensions and form.
EN 755-6, Aluminium and aluminium alloys Ð
Extruded rod/bar, tube and profiles Ð
Part 6: Hexagonal bars, tolerances on dimensions
and form.
EN 755-8, Aluminium and aluminium alloys Ð
Extruded rod/bar, tube and profiles Ð
Part 8: Porthole tubes, tolerances on dimensions
and form.
EN 755-9, Aluminium and aluminium alloys Ð
Extruded rod/bar, tube and profiles Ð
Part 9: Profiles, tolerances on dimensions and form.

 BSI 1998
 Page 3
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EN 755-7:1998

1 Scope 2 Alloy groups

This part of EN 755 specifies the tolerances on For the purposes of this European Standard, the alloys
dimensions and form for aluminium and aluminium are distributed into two groups which correspond to
alloy extruded seamless tubes with an outside diameter varying degrees of difficulty when manufacturing the
(OD) from 8 mm to 450 mm (round tube, see Figure 1) products.
or with a cross-section contained within a The division into group I and group II of the most
circumscribing circle (CD) from 10 mm to 350 mm commonly used general engineering alloys is specified
(other than round tube, see Figure 2), supplied in in Table 1. Grouping of other alloys is subject to
straight lengths. agreement between purchaser and supplier.
This standard applies only to tube produced by the
seamless die/mandrel method of extrusion.
3 Tolerances on dimensions
This standard applies to extruded seamless tube for
general engineering applications only. 3.1 General
This standard does not apply to extruded tube When outside diameter OD, inside diameter ID, and
produced by tube porthole/bridge method or coiled wall thickness t, (or their equivalent dimensions in
tube. other than round tube) are all specified, standard
tolerances shall apply to any two of these dimensions,
but not to all three. As a result, the purchaser shall
state only two nominal dimensions on any given order.
3.2 Diameter Ð round tube
Mean diameter is defined as the average of two
diameter measurements taken at right angles to each
other at any point along the length.
The tolerances on diameter are specified in Table 2.
3.3 Width, depth or width across flats Ð
squares, rectangles, hexagons, octagons
The tolerances on width, depth or width across flats
are specified in Table 3.
3.4 Wall thickness
Figure 1 Ð Round tube The tolerances on wall thickness are specified in
Table 4 for round tubes and in Table 5 for other than
round tubes.

Figure 2 Ð Circumscribing circle for other

than round tube

 BSI 1998
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EN 755-7:1998

Table 1 Ð Alloy groups

Group I EN AW-1050A, EN AW-1070A, EN AW-1200, EN AW-1350
EN AW-3003, EN AW-3103
EN AW-5005, EN AW-5005A
EN AW-6101A, EN AW-6101B, EN AW-6005, EN AW-6005A,
EN AW-6106, EN AW-6060, EN AW-6063, EN AW-6063A, EN-AW6463
Group II EN AW-2007, EN AW-2011, EN AW-2011A, EN AW-2014, EN AW-2014A, EN AW-2017A,
EN AW-2024, EN AW-2030
EN AW-50191) , EN AW-5051A, EN AW-5251, EN AW-5052,
EN AW-5154A, EN AW-5454, EN AW-5754, EN AW-5083, EN AW-5086
EN AW-6012, EN AW-6018, EN AW-6351, EN AW-6061, EN AW-6261, EN AW-6262,
EN AW-6081, EN AW-6082,
EN AW-7003, EN AW-7005, EN AW-7020, EN AW-7022, EN AW-7049A, EN AW-7075
1) EN AW-5019 is the new designation for EN AW-5056A.

Table 2 Ð Tolerances on diameter for round tube

Dimensions in millimetres
Diameter Tolerance on diameter
(OD or ID) Maximum allowable deviation Maximum allowable deviation of diameter at any
of mean diameter from point from specified diameter1)
specified diameter6)
Over Up to and Non-annealed Heat treated Annealed tube4)
including and non heat tube3)
treated tube2)
$8 18 ±0,255) ±0,405) ±0,605) ±1,55)
18 30 ±0,30 ±0,50 ±0,70 ±1,8
30 50 ±0,35 ±0,60 ±0,90 ±2,2
50 80 ±0,40 ±0,70 ±1,1 ±2,6
80 120 ±0,60 ±0,90 ±1,4 ±3,6
120 200 ±0,90 ±1,4 ±2,0 ±5,0
200 350 ±1,4 ±1,9 ±3,0 ±7,6
350 450 ±1,9 ±2,8 ±4,0 ±10,0
1)Not applicable to tubes having a wall thickness less than 2,5 % of the specified outside diameter. The tolerance for tubes with wall
thickness less than 2,5 % of the specified outside diameter shall be determined by multiplying the applicable tolerance as follows:
Ð wall thickness over 2,0 % up to and including 2,5 % of outside diameter: 1,5 3 tolerance;
Ð wall thickness over 1,5 % up to and including 2,0 % of outside diameter: 2,0 3 tolerance;
Ð wall thickness over 1,0 % up to and including 1,5 % of outside diameter: 3,0 3 tolerance;
Ð wall thickness over 0,5 % up to and including 1,0 % of outside diameter: 4,0 3 tolerance.
2) Applies to all alloys in F or H112 tempers.
3) Applies to all alloys in T4, T5, T6, T64, T66 and Tx511 tempers.
4) Applies to all alloys in O, H111 and Tx510 tempers.
5)This tolerance applies for outside diameter only, i.e. tube in this size range can only be specified as ªOutside Diameter 3 Wall
Thicknessº.
6) Not applicable to Tx510 or Tx511 tempers.

 BSI 1998
 Page 5
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EN 755-7:1998

Table 3 Ð Tolerances on width, depth or width across flats

Dimensions in millimetres
Width, depth or width Tolerances on width, depth or width across flats1)2)
across flats
CD # 100 100 < CD # 200 200 < CD # 300 300 < CD # 350
Over Up to and Alloy Alloy Alloy Alloy Alloy Alloy Alloy Alloy
including group I group II group I group II group I group II group I group II
Ð 10 ±0,25 ±0,40 ±0,30 ±0,50 ±0,35 ±0,55 ±0,40 ±0,60
10 25 ±0,30 ±0,50 ±0,40 ±0,70 ±0,50 ±0,80 ±0,60 ±0,90
25 50 ±0,50 ±0,80 ±0,60 ±0,90 ±0,80 ±1,0 ±0,90 ±1,2
50 100 ±0,70 ±1,0 ±0,90 ±1,2 ±1,1 ±1,3 ±1,3 ±1,6
100 150 Ð Ð ±1,1 ±1,5 ±1,3 ±1,7 ±1,5 ±1,8
150 200 Ð Ð ±1,3 ±1,9 ±1,5 ±2,2 ±1,8 ±2,4
200 300 Ð Ð Ð Ð ±1,7 ±2,5 ±2,1 ±2,8
300 350 Ð Ð Ð Ð Ð Ð ±2,8 ±3,5
1)
Not applicable to tubes having a wall thickness less than 2,5 % of the specified outside width, depth or width across flats. The
tolerance for tubes with wall thickness less than 2,5 % of the specified width, depth or width across flats shall be determined by
multiplying the applicable tolerance as follows:
Ð wall thickness over 2,0 % up to and including 2,5 % of outside parameter: 1,5 3 tolerance;
Ð wall thickness over 1,5 % up to and including 2,0 % of outside parameter: 2,0 3 tolerance;
Ð wall thickness over 1,0 % up to and including 1,5 % of outside parameter: 3,0 3 tolerance;
Ð wall thickness over 0,5 % up to and including 1,0 % of outside parameter: 4,0 3 tolerance.
2) These tolerances do not apply to tempers O and Tx510. For these tempers the tolerances shall be subject to agreement between the
supplier and the purchaser.

Table 4 Ð Tolerances on wall thickness for 3.5 Length

round tubes If fixed lengths are to be supplied, this shall be stated
Nominal wall thickness Tolerance on wall on the order. The maximum allowable tolerances on
t thickness measured fixed length are specified in Table 6.
mm at any point
Over Up to and %
including
$ 0,5 2 ±10
2 3 ±9
3 Ð ±8

 BSI 1998
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EN 755-7:1998

Table 5 Ð Tolerances on wall thickness for other than round tubes

Dimensions in millimetres
Nominal wall thickness Tolerances on wall thickness for circumscribing circle CD
t
CD # 100 100 < CD # 300 300 < CD # 350
Over Up to and including Alloy Alloy Alloy Alloy Alloy Alloy
group I group II group I group II group I group II
$ 0,5 1,5 ±0,25 ±0,35 ±0,35 ±0,50 Ð Ð
1,5 3 ±0,30 ±0,45 ±0,50 ±0,65 ±0,75 ±0,90
3 6 ±0,50 ±0,60 ±0,75 ±0,90 ±1,0 ±1,2
6 10 ±0,75 ±1,0 ±1,0 ±1,3 ±1,2 ±1,5
10 15 ±1,0 ±1,3 ±1,2 ±1,7 ±1,5 ±1,9
15 20 ±1,5 ±1,9 ±1,9 ±2,2 ±2,0 ±2,5
20 30 ±1,9 ±2,2 ±2,2 ±2,7 ±2,5 ±3,1
30 40 Ð Ð ±2,5 Ð ±2,7 Ð

Table 6 Ð Tolerances on fixed length

Dimensions in millimetres
Outside diameter or diameter of Tolerances on fixed length
circumscribing circle
Over Up to and L # 2 000 2 000 5 000 10 000 15 000
including < L # 5 000 < L # 10 000 < L # 15 000 < L # 25 000
$8 100 +5 +7 +10 +16 +22
0 0 0 0 0
100 200 +7 +9 +12 +18 +24
0 0 0 0 0
200 450 +8 +11 +14 +20 +28
0 0 0 0 0

If no fixed length is specified in the order, seamless 4 Tolerances on form

tubes may be delivered in random lengths.
4.1 General
The length range and the tolerances on the random
length shall be subject to agreement between Tolerances on form for O and Tx510 tempers shall be
purchaser and supplier. subject to agreement between purchaser and supplier.
3.6 Squareness of cut ends 4.2 Straightness
The squareness of cut ends shall be within half of the Deviations from straightness, hs and ht, shall be
fixed-length tolerance range specified in Table 6 for measured as shown in Figure 3 with the tube placed on
both fixed and random lengths, e.g. for a fixed-length a horizontal baseplate so that its mass decreases the
tolerance of +10 deviation.
0 mm, the squareness of cut ends shall
be within 5 mm. The straightness tolerances of round tubes are
specified in Table 7.
The straightness tolerance ht of other than round tubes
shall not exceed 1,5 mm/m length. Local deviations hs
from straightness shall not exceed 0,6 mm/300 mm
length.

 BSI 1998
 Page 7
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EN 755-7:1998

Figure 3 Ð Measurement of the deviation from straightness

Table 7 Ð Straightness tolerances of round 4.3 Convexity±concavity

tube The convexity±concavity of other than round tube
Dimensions in millimetres shall be measured as shown in Figure 4. The
Outside diameter Maximum Maximum
convexity±concavity tolerances are specified in Table 8.
deviation localized
from kink in any
straightness 300 mm 4.4 Twist
ht portion The twist measurement shall be carried out as shown
hs in Figure 5 with the tube resting under its own mass on
in mm/m a flat base plate.
Over Up to and The twist tolerances are specified in Table 9 as a
including function of the width W and the length L of the tube.
$8 150 1,5 0,8
150 250 2,5 1,3
250 450 3,5 1,8

The straightness tolerances for tubes having a wall

thickness less than 1,5 % of the specified outside
diameter shall be subject to agreement between
purchaser and supplier.

 BSI 1998
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EN 755-7:1998

Figure 4 Ð Measurement of convexity Ð concavity

Table 8 Ð Convexity Ð concavity tolerances

Dimensions in millimetres
Width W Maximum allowable deviation f
Over Up to and including Wall thickness # 5 Wall thickness > 5
Ð 30 0,30 0,20
30 60 0,40 0,30
60 100 0,60 0,40
100 150 0,90 0,60
150 200 1,2 0,80
200 350 1,8 1,2

 BSI 1998
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EN 755-7:1998

4.5 Angularity
The deviation from square of square tubes and
rectangular tubes shall be measured as shown in
Figure 6. The maximum allowable deviation from
square is specified in Table 10 as a function of tube
depth b. In the case of rectangular tubes, the tolerance
on squareness shall apply to the shorter side of the
tube.
The maximum allowable deviation in an angle other
than a right angle (hexagonal tubes, octagonal tubes)
shall be included within the width across flats
tolerances, see Table 3.

Figure 5 Ð Measurement of twist

Table 9 Ð Twist tolerances

Dimensions in millimetres
Width W Twist tolerance T Figure 6 Ð Measurement of deviation from
Per On total tube length L
square
Over Up to and 1 000 mm Up to and Over 6 000
including of including
length1) 6 000 Table 10 Ð Squareness tolerances for square
$ 10 30 1,2 2,5 3,0 and rectangular tubes
Dimensions in millimetres
30 50 1,5 3,0 4,0
Depth Maximum allowable
50 100 2,0 3,5 5,0 b deviation z from square

100 200 2,5 5,0 7,0 Over Up to and

including
200 350 2,5 6,0 8,0
Ð 30 0,4
1)
Twist tolerances for lengths less than 1 000 mm shall be
subject to agreement between purchaser and supplier. 30 50 0,7
50 80 1,0
80 120 1,4
120 180 2,0
180 240 2,6
240 350 3,1

 BSI 1998
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EN 755-7:1998

4.6 Corner and fillet radii

Sharp corners and fillet radii may be slightly rounded
unless otherwise indicated on the drawing. The
maximum allowable radii are specified in Table 11.
When corner or fillet radius is specified, the maximum
allowable deviation from the nominal value is specified
in Table 12.

Table 11 Ð Maximum allowable corner and

fillet radii
Dimensions in millimetres
Wall thickness Maximum allowable corner and fillet
radii
Alloy group I Alloy group II1)
#5 0,6 0,8
>5 1,0 1,5
1)These tolerances only apply to 6xxx series alloys in group II.
The maximum allowable radii for the other alloys in group II
shall be subject to agreement between purchaser and supplier.

Table 12 Ð Allowable deviation from specified

corner and fillet radii
Specified radius Maximum allowable deviation from
mm nominal value of the radius
#5 ±0,5 mm
>5 ±10 %

4.7 Depth of dents for round tube

It is recognised in certain applications that the depth
of surface dents can be an important factor particularly
for round tube with large diameter to wall thickness
ratios. In such cases the maximum allowable depth of
dents shall be subject to agreement between purchaser
and supplier.

 BSI 1998
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blank
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| agreement. Details and advice can be obtained from the Copyright Manager.
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| Tel: 020 8996 7070.
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BSI |
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389 Chiswick High Road |
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London |
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W4 4AL |
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