Aluminium and aluminium alloys Ð Extruded rod/bar, tube and profiles Ð

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1 BRITISH STANDARD BS EN 755-7:1998 The European Standard has the status of a British Standard ICS ; NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Aluminium and aluminium alloys Ð Extruded rod/bar, tube and profiles Ð Part 7: Seamless tubes, tolerances on dimensions and form

2 BS National foreword This British Standard is the English language version of. This part of BS EN 755 is published together with: BS EN 755, Aluminium and aluminium alloys 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 British Standards partially superseded by this standard and other European Standards BS 1474:1987 BS 43-4:1973 BS 43-12:1969 BS 43-15:1973 EN 515 EN 515 EN 515 EN 515 EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN EN In addition, the British Standards in the table will be withdrawn when the following European Standards are published: EN 755, Aluminium and aluminium alloys Ð Part 9: Profiles, tolerances on dimensions and form. EN 122, Aluminium and aluminium alloys Ð Extruded precision profiles in alloys EN AW 66/EN AW 663 Ð Part 1: Technical conditions for inspection and delivery. EN 122, Aluminium and aluminium alloys Ð Extruded precision profiles in alloys EN AW 66/EN AW 663 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. This British Standard, having been prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 December 1998 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. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 1, an inside back cover and a back cover. Amendments issued since publication Amd. No. Date Text affected ISBN

3 EUROPEAN STANDARD EN NORME EUROPE ENNE EUROPAÈ ISCHE NORM July 1998 ICS 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 Barres, tubes et profieâs fileâs Ð Partie 7: Tubes fileâs sur aiguille, toleârances sur dimensions et forme Aluminium und Aluminiumlegierungen Ð Stranggepreûte Stangen, Rohre und Profile Ð Teil 7: Nahtlose Rohre, Grenzabmaûe und Formtoleranzen This European Standard was approved by CEN on 1 July 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 fuè r Normung Central Secretariat: rue de Stassart 36, B-15 Brussels 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. E

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

5 Page 3 1 Scope This part of EN 755 specifies the tolerances on dimensions and form for aluminium and aluminium alloy extruded seamless tubes with an outside diameter (OD) from 8 mm to 45 mm (round tube, see Figure 1) or with a cross-section contained within a circumscribing circle (CD) from 1 mm to 35 mm (other than round tube, see Figure 2), supplied in straight lengths. This standard applies only to tube produced by the seamless die/mandrel method of extrusion. This standard applies to extruded seamless tube for general engineering applications only. This standard does not apply to extruded tube produced by tube porthole/bridge method or coiled tube. Figure 1 Ð Round tube 2 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 purchaser and supplier. 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 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 Width, depth or width across flats Ð squares, rectangles, hexagons, octagons The tolerances on width, depth or width across flats are specified in Table Wall thickness 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

6 Page 4 Group I Group II Table 1 Ð groups EN AW-15A, EN AW-17A, EN AW-12, EN AW-135 EN AW-33, EN AW-313 EN AW-55, EN AW-55A EN AW-611A, EN AW-611B, EN AW-65, EN AW-65A, EN AW-616, EN AW-66, EN AW-663, EN AW-663A, EN-AW6463 EN AW-27, EN AW-211, EN AW-211A, EN AW-214, EN AW-214A, EN AW-217A, EN AW-224, EN AW-23 EN AW-519 1), EN AW-551A, EN AW-5251, EN AW-552, EN AW-5154A, EN AW-5454, EN AW-5754, EN AW-583, EN AW-586 EN AW-612, EN AW-618, EN AW-6351, EN AW-661, EN AW-6261, EN AW-6262, EN AW-681, EN AW-682, EN AW-73, EN AW-75, EN AW-72, EN AW-722, EN AW-749A, EN AW-775 1) EN AW-519 is the new designation for EN AW-556A. Over Diameter (OD or ID) Table 2 Ð Tolerances on diameter for round tube Maximum allowable deviation of mean diameter from specified diameter 6) Tolerance on diameter Maximum allowable deviation of diameter at any point from specified diameter 1) Non-annealed and non heat treated tube 2) Heat treated tube 3) Annealed tube 4) $ 8 18 ±,25 5) ±,4 5) ±,6 5) ±1,5 5) 18 3 ±,3 ±,5 ±,7 ±1,8 3 5 ±,35 ±,6 ±,9 ±2,2 5 8 ±,4 ±,7 ±1,1 ±2, ±,6 ±,9 ±1,4 ±3, ±,9 ±1,4 ±2, ±5, 2 35 ±1,4 ±1,9 ±3, ±7, ±1,9 ±2,8 ±4, ±1, 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, % up to and 2,5 % of outside diameter: 1,5 3 tolerance; Ð wall thickness over 1,5 % up to and 2, % of outside diameter: 2, 3 tolerance; Ð wall thickness over 1, % up to and 1,5 % of outside diameter: 3, 3 tolerance; Ð wall thickness over,5 % up to and 1, % of outside diameter: 4, 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 Tx51 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 Tx51 or Tx511 tempers.

7 Page 5 Width, depth or width across flats Table 3 Ð Tolerances on width, depth or width across flats Tolerances on width, depth or width across flats 1)2) CD # 1 1 < CD # 2 2 < CD # 3 3 < CD # 35 Over group I group II group I group II group I group II group I Ð 1 ±,25 ±,4 ±,3 ±,5 ±,35 ±,55 ±,4 ±, ±,3 ±,5 ±,4 ±,7 ±,5 ±,8 ±,6 ±, ±,5 ±,8 ±,6 ±,9 ±,8 ±1, ±,9 ±1,2 5 1 ±,7 ±1, ±,9 ±1,2 ±1,1 ±1,3 ±1,3 ±1, Ð Ð ±1,1 ±1,5 ±1,3 ±1,7 ±1,5 ±1, Ð Ð ±1,3 ±1,9 ±1,5 ±2,2 ±1,8 ±2,4 2 3 Ð Ð Ð Ð ±1,7 ±2,5 ±2,1 ±2, 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, % up to and 2,5 % of outside parameter: 1,5 3 tolerance; Ð wall thickness over 1,5 % up to and 2, % of outside parameter: 2, 3 tolerance; Ð wall thickness over 1, % up to and 1,5 % of outside parameter: 3, 3 tolerance; Ð wall thickness over,5 % up to and 1, % of outside parameter: 4, 3 tolerance. group II 2) These tolerances do not apply to tempers O and Tx51. For these tempers the tolerances shall be subject to agreement between the supplier and the purchaser. Table 4 Ð Tolerances on wall thickness for round tubes Nominal wall thickness t mm Over $,5 2 ±1 2 3 ±9 3 Ð ±8 Tolerance on wall thickness measured at any point % 3.5 Length If fixed lengths are to be supplied, this shall be stated on the order. The maximum allowable tolerances on fixed length are specified in Table 6.

8 Page 6 Table 5 Ð Tolerances on wall thickness for other than round tubes Nominal wall thickness t Over group I Tolerances on wall thickness for circumscribing circle CD CD # 1 1 < CD # 3 3 < CD # 35 group II group I group II group I $,5 1,5 ±,25 ±,35 ±,35 ±,5 Ð Ð 1,5 3 ±,3 ±,45 ±,5 ±,65 ±,75 ±,9 3 6 ±,5 ±,6 ±,75 ±,9 ±1, ±1,2 6 1 ±,75 ±1, ±1, ±1,3 ±1,2 ±1, ±1, ±1,3 ±1,2 ±1,7 ±1,5 ±1, ±1,5 ±1,9 ±1,9 ±2,2 ±2, ±2,5 2 3 ±1,9 ±2,2 ±2,2 ±2,7 ±2,5 ±3,1 3 4 Ð Ð ±2,5 Ð ±2,7 Ð group II Outside diameter or diameter of circumscribing circle Over $ Table 6 Ð Tolerances on fixed length L # 2 2 < L # Tolerances on fixed length < L # < L # < L # 25 If no fixed length is specified in the order, seamless tubes may be delivered in random lengths. The length range and the tolerances on the random length shall be subject to agreement between purchaser and supplier. 3.6 Squareness of cut ends The squareness of cut ends shall be within half of the fixed-length tolerance range specified in Table 6 for both fixed and random lengths, e.g. for a fixed-length +1 tolerance of mm, the squareness of cut ends shall be within 5 mm. 4 Tolerances on form 4.1 General Tolerances on form for O and Tx51 tempers shall be subject to agreement between purchaser and supplier. 4.2 Straightness Deviations from straightness, h s and h t, shall be measured as shown in Figure 3 with the tube placed on a horizontal baseplate so that its mass decreases the deviation. The straightness tolerances of round tubes are specified in Table 7. The straightness tolerance h t of other than round tubes shall not exceed 1,5 mm/m length. Local deviations h s from straightness shall not exceed,6 mm/3 mm length.

9 Page 7 Figure 3 Ð Measurement of the deviation from straightness Table 7 Ð Straightness tolerances of round tube Outside diameter Over Maximum deviation from straightness h t in mm/m $ ,5, ,5 1, ,5 1,8 Maximum localized kink in any 3 mm portion h s 4.3 Convexity±concavity The convexity±concavity of other than round tube shall be measured as shown in Figure 4. The convexity±concavity tolerances are specified in Table Twist The twist measurement shall be carried out as shown in Figure 5 with the tube resting under its own mass on a flat base plate. The twist tolerances are specified in Table 9 as a function of the width W and the length L of the tube. 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.

10 Page 8 Figure 4 Ð Measurement of convexity Ð concavity Table 8 Ð Convexity Ð concavity tolerances Width W Maximum allowable deviation f Over Wall thickness # 5 Wall thickness > 5 Ð 3,3,2 3 6,4,3 6 1,6,4 1 15,9, ,2, ,8 1,2

11 Page 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 1 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 Over Width W Table 9 Ð Twist tolerances Per 1 mm of length 1) Twist tolerance T On total tube length L 6 $ 1 3 1,2 2,5 3, 3 5 1,5 3, 4, 5 1 2, 3,5 5, 1 2 2,5 5, 7, ,5 6, 8, 1) Twist tolerances for lengths less than 1 mm shall be subject to agreement between purchaser and supplier. Over 6 Figure 6 Ð Measurement of deviation from square Table 1 Ð Squareness tolerances for square and rectangular tubes Over Depth b Ð 3,4 3 5, , , , , ,1 Maximum allowable deviation z from square

12 Page 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 Wall thickness Maximum allowable corner and fillet radii group I group II 1) # 5,6,8 > 5 1, 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 mm # 5 ±,5 mm >5 ±1 % Maximum allowable deviation from nominal value of the radius 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.

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