EN 755-7:2008

SLOVENSKI STANDARD
01-maj-2008
1DGRPHãþD
SIST EN 755-7:1999
Aluminij in aluminijeve zlitine - Iztiskane palice/drogovi, cevi in profili - 7. del:
Nevarjene (narejene iz celega) cevi, tolerance mer in oblike
Aluminium and aluminium alloys - Extruded rod/bar, tube and profiles - Part 7: Seamless
tubes, tolerances on dimensions and form
Aluminium und Aluminiumlegierungen - Stranggepresste Stangen, Rohre und Profile -
Teil 7: Nahtlose Rohre, Grenzabmaße und Formtoleranzen
Aluminium et alliage d'aluminium - Barres, tubes et profilés - Partie 7 : Tubes filés sur
aiguille, tolérances sur dimensions et forme
Ta slovenski standard je istoveten z: EN 755-7:2008
ICS:
77.150.10
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 755-7
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2008
ICS 77.150.10 Supersedes EN 755-7:1998
English Version
Aluminium and aluminium alloys - Extruded rod/bar, tube and
profiles - Part 7: Seamless tubes, tolerances on dimensions and
form
Aluminium et alliages d'aluminium - Barres, tubes et Aluminium und Aluminiumlegierungen - Stranggepresste
profilés filés - Partie 7: Tubes filés sur aiguille, tolérances Stangen, Rohre und Profile - Teil 7: Nahtlose Rohre,
sur dimensions et forme Grenzabmaße und Formtoleranzen
This European Standard was approved by CEN on 10 February 2008.
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 CEN Management Centre 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 CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 755-7:2008: E
worldwide for CEN national Members.

Contents Page
Foreword. 3
1 Scope. 5
2 Alloy groups. 6
3 Tolerances on dimensions. 6
3.1 General. 6
3.2 Diameter - Round tube. 6
3.3 Width, depth or width across flats - squares, rectangles, hexagons, octagons. 7
3.4 Wall thickness variation (eccentricity). 8
3.5 Length. 9
3.6 Squareness of cut ends. 10
4 Tolerances on form. 10
4.1 General. 10
4.2 Straightness. 10
4.3 Convexity-Concavity. 11
4.4 Twist. 12
4.5 Angularity. 14
4.6 Corner and fillet radii. 14
4.7 Depth of dents for round tube . 15
Annex A (informative) Wall thickness variation (eccentricity). 16
A.1 General. 16
A.2 Specifying round tube sizes and tolerances. 16
A.2.1 General. 16
A.2.2 Wall thickness variation for tubes specified as OD ×××× t or ID ×××× t. 16
A.2.3 Wall thickness variation for tubes specified as OD ×××× ID. 17
Bibliography . 18

Foreword
This document (EN 755-7:2008) has been prepared by Technical Committee CEN/TC 132 “Aluminium and
aluminium alloys”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by September 2008, and conflicting national standards shall be withdrawn
at the latest by September 2008.
This document supersedes EN 755-7:1998.
Within its programme of work, Technical committee CEN/TC 132 entrusted CEN/TC 132/WG 5 "Extruded and
drawn products" to revise EN 755-7:1998.
The following technical modifications have been introduced during the revision:
 Clause 1: Scope is clarified with respect to what is not included
 Clause 2: Alloys EN AW-3102, EN AW-6008, EN AW-6014, EN AW-6360 are added in Group I
 Alloys EN AW-5049, EN AW-6110A, EN AW-6023, EN AW-7108, EN AW-7108A and EN AW-7021 are
added in Group II
 Subclauses 3.4 and Table 4: Requirements to wall thickness variation (eccentricity) is introduced
 Annex A: Informative Annex A is added explaining wall thickness variation (eccentricity)
EN 755 comprises the following parts under the general title "Aluminium and aluminium alloys — Extruded
rod/bar, tube and profiles":
 Part 1: Technical conditions for inspection and delivery
 Part 2: Mechanical properties
 Part 3: Round bars, tolerances on dimensions and form
 Part 4: Square bars, tolerances on dimensions and form
 Part 5: Rectangular bars, tolerances on dimensions and form
 Part 6: Hexagonal bars, tolerances on dimensions and form
 Part 7: Seamless tubes, tolerances on dimensions and form
 Part 8: Porthole tubes, tolerances on dimensions and form
 Part 9: Profiles, tolerances on dimensions and form
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
CEN/TC 132 affirms it is its policy that in the case when a patentee refuses to grant licenses on standardized
standards products under reasonable and not discriminatory conditions then this product shall be removed
from the corresponding standard.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
1 Scope
This document specifies the tolerances on dimensions and form for aluminium and aluminium alloy extruded
seamless tubes with an outside diameter (OD) from 8 mm to 450 mm (round tube, see Figure 1) or with a
cross section contained within a circumscribing circle (CD) from 10 mm to 350 mm (other than round tube, see
Figure 2), supplied in straight lengths.
This standard only applies to tube produced by the seamless die/mandrel method of extrusion. This standard
applies to extruded seamless tube for general engineering applications only.
The temper designations used in this part are according to EN 515.
This European Standard does not apply to:
 extruded tubes produced by porthole/bridge method (EN 755-8),
 tubes delivered in coils (prEN 13957),
 coiled tubes cut to length (prEN 13957).

Figure 1 — Round tube
Figure 2 — Circumscribing circle for other than round tube
2 Alloy groups
For the purposes of this European Standard, the alloys are distributed into two groups which correspond to
varying degrees of difficulty when manufacturing the products.
The division into group I and group II of the most commonly used general engineering alloys is specified in
Table 1. Grouping of other alloys is subject to agreement between supplier and purchaser.
Table 1 — Alloy groups
EN AW-1050A, EN AW-1070A, EN AW-1200, EN AW-1350
EN AW-3102, EN AW-3003, EN AW-3103
Group I
EN AW-5005, EN AW-5005A
EN AW-6101A, EN AW-6101B, EN AW-6005, EN AW-6005A,
EN AW-6106, EN AW-6008 EN AW-6014, EN AW-6060, EN AW-6360,
EN AW-6063, EN AW-6063A, EN AW-6463
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-5019, EN AW-5049, EN AW-5051A, EN AW-5251, EN AW-5052,
EN AW-5154A, EN AW-5454, EN AW-5754, EN AW-5083, EN AW-5086
Group II
EN AW-6110A, EN AW-6012, EN AW-6018, EN AW-6023, 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-7108, EN AW-7108A, EN AW-7020,
EN AW-7021, EN AW-7022, EN AW-7049A, EN AW-7075
3 Tolerances on dimensions
3.1 General
When outside diameter OD, inside diameter ID, and wall thickness t, (or their equivalent dimensions in 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 only state two nominal dimensions on any given order.
3.2 Diameter - Round tube
Mean diameter is defined as the average of two diameter measurements taken at right angles to each other
at any position along the length.
The tolerances on diameter are specified in Table 2.

Table 2 — Tolerances on diameter for round tube
Dimensions in millimetres
Tolerance on diameter
Diameter
Maximum allowable deviation of diameter at
(OD or ID)
a
any point from specified diameter
Maximum allowable deviation
Tempers O,
of mean diameter from
d
Up to and Tempers F Heat treated H111 and
specified diameter
Over
b
including and H112 tube Tx510

c c c c
18 ± 0,25 ± 0,40 ± 0,60 ± 1,5
≥ 8
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
a
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 :
- wall thickness over 2,0 % up to and including 2,5 % of outside diameter: 1,5 x tolerance;
- wall thickness over 1,5 % up to and including 2,0 % of outside diameter: 2,0 x tolerance;
- wall thickness over 1,0 % up to and including 1,5 % of outside diameter: 3,0 x tolerance;
- wall thickness over 0,5 % up to and including 1,0 % of outside diameter: 4,0 x tolerance.
b
Applies to all alloys in T4, T5, T6, T64, T66 and Tx511 tempers.
c
This tolerance applies for outside diameter only, i.e. tube in this size range can only be specified as "Outside Diameter x Wall
Thickness".
d
Not applicable to Tx510 or Tx511 tempers.
3.3 Width, depth or width across flats - squares, rectangles, hexagons, octagons
The tolerances on width, depth or width across flats are specified in Table 3.

Table 3 — Tolerances on width, depth or width across flats
Dimensions in millimetres
a b
Width, depth or
Tolerances on width, depth or width across flats
width
CD ≤ 100 100 < CD ≤ 200 200 < CD ≤ 300 300 < CD ≤ 350
across flats
Alloy Alloy Alloy Alloy Alloy Alloy Alloy Alloy
Up to and
Over group group group group group group group group
including
I II I II I II I II
- 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 - - ± 1,1 ± 1,5 ± 1,3 ± 1,7 ± 1,5 ± 1,8
150 200 - - ± 1,3 ± 1,9 ± 1,5 ± 2,2 ± 1,8 ± 2,4
200 300 - - - - ± 1,7 ± 2,5 ±
...