BS-EN-755-4-1996.pdf
BRITISH STANDARD BS EN 755-4:1996 Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 4: Square bars, tolerances on dimensions and form The European Standard EN 755-4:1995 has the status of a British Standard ICS 77.120.10; 77.140.90 BS EN 755-4:1996 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 June 1996 © BSI 12-1998 The following BSI references relate to the work on this standard: Committee reference NFE/35 Draft for comment 92/47294 DC ISBN 0 580 25789 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee NFE/35, Light metals and their alloys, upon which the following bodies were represented: Aluminium Federation Aluminium Stockholders Association London Metal Exchange Magnesium Industry Council The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Association of British Welded Aluminium Tube Makers Association of Light Alloy Refiners Limited Institution of Structural Engineers Metal Packaging Manufacturers Association Amendments issued since publication Amd. No.DateComments BS EN 755-4:1996 © BSI 12-1998i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN 755-43 BS EN 755-4:1996 ii © BSI 12-1998 National foreword This Part of BS EN 755 has been prepared by Technical Committee NFE/35 and is the English language version of EN 755-4:1995 Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 4: Square bars, tolerances on dimensions and form. This Part of BS EN 755 is published with: BS EN 755, Aluminium and aluminium alloys Extruded rod/bar, tube and profiles. BS EN 755-3, Round bars, tolerances on dimensions and form. BS EN 755-5, Rectangular bars, tolerances on dimensions and form. BS EN 755-6, Hexagonal bars, tolerances on dimensions and form. BS EN 754, Aluminium and aluminium alloys Cold drawn rod/bar and tube. BS EN 754-3, Round bars, tolerances on dimensions and form. BS EN 754-4, Square bars, tolerances on dimensions and form. BS EN 754-5, Rectangular bars, tolerances on dimensions and form. BS EN 754-6, Hexagonal bars, tolerances on dimensions and form. As a result, the following standards are partially superseded by those listed above. The European standards should be used in preference whenever possible. BS 1474:1987, Specification for wrought aluminium and aluminium alloys for general engineering purposes Bars, extruded round tubes and sections. BS 4300, Wrought aluminium alloys for general engineering purposes (supplementary series). BS 4300-4:1973, 6463 Solid extruded bars and sections suitable for bright trim/reflector applications. BS 4300-5:1973, 2011 Free cutting bar and wire. BS 4300-12:1969, 5454 Bars, extruded round tube and sections. BS 4300-15:1973, 7020 Bar, extruded round tube and sections. BS 2898:1970, Specification for wrought aluminium and aluminium alloys for electrical purposes Bars, extruded round tube and sections. When the following European Standards are published the above British Standards will be withdrawn. BS EN 755, Aluminium and aluminium alloys Extruded rod/bar, tube and profiles. BS EN 755-1, Technical conditions for inspection and delivery. BS EN 755-2, Mechanical properties. BS EN 754, Aluminium and aluminium alloys Cold drawn rod/bar and tube. BS EN 754-1, Technical conditions for inspection and delivery. BS EN 754-2, Mechanical properties. 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, pages i and ii, the EN title page, pages 2 to 5 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM EN 755-4 June 1995 ICS 77.120.10; 77.140.90 Descriptors: Extruded products, rolled products, aluminium, aluminium alloys, metal bars, square bars, dimensions, dimensional tolerances, form tolerances English version Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 4: Square bars, tolerances on dimensions and form Aluminium et alliages daluminium Barres, tubes et profilés filés Partie 4: Barres carrées, tolérances sur dimensions et forme Aluminium und Aluminiumlegierungen Stranggeprete Stangen, Rohre und Profile Teil 4: Vierkantstangen, Grenzabmae und Formtoleranzen This European Standard was approved by CEN on 1995-05-14. 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comité Européen de Normalisation Europäisches Komitee für Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels © 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members. Ref. No. EN 755-4:1995 E EN 755-4:1995 © BSI 1998 2 Foreword This European Standard has been prepared by the 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 December 1995, and conflicting national standards shall be withdrawn at the latest by December 1995. 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 755-4, Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 4: Square bars, tolerances on dimensions and form. This standard is part of a set of nine standards. The other standards deal with: EN 755-1, Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 1: Technical conditions for inspection and delivery. EN 755-2, Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 2: Mechanical properties. EN 755-3, Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 3: Round bars, tolerances on dimensions and form. EN 755-5, Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 5: Rectangular bars, tolerances on dimensions and form. EN 755-6, Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 6: Hexagonal bars, tolerances on dimensions and form. EN 755-7, Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 7: Seamless tubes, tolerances on dimensions and form. EN 755-8, Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 8: Porthole tubes, tolerances on dimensions and form. EN 755-9, Aluminium and aluminium alloys Extruded rod/bar, tube and profiles Part 9: Profiles, tolerances on dimensions and form. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland, United Kingdom. Contents Page Foreword2 1Scope3 2Tolerances on dimensions and form3 2.1Width across flats3 2.2Corner radii3 2.3Squareness3 2.4Convexity concavity3 2.5Straightness3 2.6Twist4 2.7Length4 2.8Squareness of cut ends5 3Alloy groups5 Figure 1 Measurement of deviation from square3 Figure 2 Measurement of deviation from straightness4 Figure 3 Measurement of twist4 Table 1 Width across flats tolerances3 Table 2 Maximum corner radii3 Table 3 Squareness tolerances3 Table 4 Straightness tolerances4 Table 5 Twist tolerances4 Table 6 Fixed length tolerances5 Table 7 Alloy groups5 EN 755-4:1995 © BSI 12-19983 1 Scope This Part of EN 755 specifies the tolerances on dimensions and form for aluminium and aluminium alloy extruded square bars having widths across flats from 10 mm up to 220 mm. 2 Tolerances on dimensions and form 2.1 Width across flats The tolerances on width across flats are specified in Table 1. For the purposes of this standard the alloys are distributed into two groups which correspond to varying 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 7. Table 1 Width across flats tolerances 2.2 Corner radii Maximum corner radii are specified in Table 2. Table 2 Maximum corner radii 2.3 Squareness The deviation from square shall be measured as shown in Figure 1. Squareness tolerances are specified in Table 3. Table 3 Squareness tolerances 2.4 Convexity concavity The convexity concavity for square bars shall be included within the width across flats tolerances. 2.5 Straightness Deviations from straightness, hs and ht, shall be measured as shown in Figure 2 with the bar placed on a horizontal baseplate so that its mass decreases the deviation. The straightness tolerances are specified in Table 4. The straightness tolerances apply to bars in all tempers except O and T × 510. If a straightness tolerance is required for either O or T × 510 temper, it shall be agreed between purchaser and supplier. Dimensions in millimetres Width across flats S Tolerances OverUp toAlloy group IAlloy group II 1018± 0,22± 0,30 1825± 0,25± 0,35 2540± 0,30± 0,40 4050± 0,35± 0,45 5065± 0,40± 0,50 6580± 0,45± 0,70 80100± 0,55± 0,90 100120± 0,65± 1,0 120150± 0,80± 1,2 150180± 1,0± 1,4 180220± 1,15± 1,7 Dimensions in millimetres Width across fiats SMaximum corner radii OverUp toAlloy group IAlloy group II 10251,01,5 25501,52,0 50802,03,0 801202,53,0 1201802,54,0 1802203,55,0 Dimensions in millimetres Width across flats S Maximum deviation from square Z OverUp to 101000,01 × width 1001801,0 1802201,5 Figure 1 Measurement of deviation from square EN 755-4:1995 4 © BSI 12-1998 Table 4 Straightness tolerances 2.6 Twist The twist measurement shall be carried out as shown in Figure 3. The twist tolerances are specified in Table 5. The twist tolerances apply to bars in all tempers except O and T × 510. If a twist tolerance is required for either O or T × 510 temper, it shall be agreed between purchaser and supplier. Table 5 Twist tolerances 2.7 Length If fixed lengths are to be supplied, this shall be stated on the order. The fixed length tolerances are specified in Table 6. Figure 2 Measurement of deviation from straightness Figure 3 Measurement of twist Dimensions in millimetres Width across flats SMaximum deviation from straightness ht mm/m Maximum localised kink in any 300 mm portion hs OverUp to 108020,8 8012021,0 12022031,5 Dimensions in millimetres Width across flats STwist tolerances T OverUp toPer 1 000 mm of length Over the total length 103013 30501,54 5012025 12022036 EN 755-4:1995 © BSI 12-19985 Table 6 Fixed length tolerances If no fixed or minimum length is specified in the order, square extruded bars may be delivered in random lengths. The actual lengths and tolerances on random lengths shall be agreed between purchaser and supplier. 2.8 Squareness of cut ends The squareness of cut ends shall be within half of the fixed-length tolerance range (Table 6) for both fixed and random lengths, e.g. for a fixed length tolerance of the squareness of cut ends shall be within 5 mm. 3 Alloy groups The division into group I and group II of the most commonly used general engineering alloys is specified in Table 7. Grouping of other alloys is subject to agreement between purchaser and supplier. Table 7 Alloy groups Dimensions in millimetres Width across flats STolerances on length OverUp toL 2 0002 000 5 000 10100 100200 200220 0 +5 0 +7 0 +10 0 +7 0 +9 0 +12 0 +8 0 +11 0 +14 0 +10mm Group IEN 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-5015A, EN AW-5251 EN AW-6101A, EN AW-6101B, EN AW-6005, EN AW-6005A, EN AW-6106, EN AW-6012, EN AW-6018, EN AW-6351, EN AW-6060, EN AW-6061, EN AW-6261, EN AW-6262, EN AW-6063, EN AW-6063A, EN AW-6463, EN AW-6081, EN AW-6082 Group IIEN 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-5019a EN AW-5052, EN AW-5154A, EN AW-5454, EN AW-5754, EN AW-5083, EN AW-5086 EN AW-7003, EN AW-7005A, EN AW-7020, EN AW-7022, EN AW-7049A, EN AW-7075 a EN AW-5019 is the new designation for EN AW-5056A. 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