Aluminium and aluminium alloys - Extruded rod/bar, tube and profiles - Part 6: Hexagonal bars, tolerances on dimensions and form

This document specifies the dimension and form tolerances for aluminium and aluminium alloy extruded hexagonal bars having widths across flats in the range from 10 mm up to 220 mm.
The temper designations used in this part are according to EN 515.

Aluminium und Aluminiumlegierungen - Stranggepresste Stangen, Rohre und Profile - Teil 6: Sechskantstangen, Grenzabmaße und Formtoleranzen

Dieses Dokument legt die Grenzabmaße und Formtoleranzen für stranggepresste Sechskantstangen aus Aluminium und Aluminiumlegierungen mit einer Schlüsselweite von 10 mm bis 220 mm fest.
Die in diesem Dokument verwendeten Bezeichnungen der Werkstoffzustände entsprechen EN 515.

Aluminium et alliages d'aluminium - Barres, tubes et profilés filés - Partie 6 : Barres hexagonales, tolérances sur dimensions et forme

Le présent document spécifie les tolérances sur dimensions et formes des barres hexagonales filées en aluminium et alliages d’aluminium de largeur sur plats comprise entre 10 mm et 220 mm inclus.
La désignation des états métallurgiques utilisés dans cette partie est conforme à l’EN 515.

Aluminij in aluminijeve zlitine - Iztiskane palice/drogovi, cevi in profili - 6. del: Palice s šesterokotnim prerezom, tolerance mer in oblike

General Information

Status
Published
Publication Date
03-Apr-2008
ICS
77.150.10 - Aluminium products
Technical Committee
INEK - Nonferrous metals
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
27-Mar-2008
Due Date
01-Jun-2008
Completion Date
04-Apr-2008
Ref Project
EN 755-6:2008 - Aluminium and aluminium alloys - Extruded rod/bar, tube and profiles - Part 6: Hexagonal bars, tolerances on dimensions and form

Relations

Replaces
SIST EN 755-6:1998 - Aluminium and aluminium alloys - Extruded rod/bar, tube and profiles - Part 6: Hexagonal bars, tolerances on dimensions and form
Effective Date
01-May-2008

Overview

SIST EN 755-6:2008 is a European Standard published by CEN that establishes the dimension and form tolerances for extruded aluminium and aluminium alloy hexagonal bars. This standard applies to bars with widths across flats ranging from 10 mm up to 220 mm. The temper designations referenced within the standard follow those outlined in EN 515.

This updated version from March 2008 supersedes the EN 755-6:1995 standard and reflects advances in alloy classifications and manufacturing precision for aluminium hexagonal profiles. It is part of the broader EN 755 series, which covers extruded rods, bars, tubes, and profiles in various cross-sectional shapes.

Key Topics

  • Scope & Alloy Groups
    SIST EN 755-6:2008 divides aluminium alloys into two groups (Group I and Group II) based on manufacturing characteristics and common engineering use. These groups influence the applicable tolerances for extrusion products.

    • Group I includes widely used alloys such as EN AW-1050A, EN AW-6061, EN AW-6082.
    • Group II covers alloys like EN AW-2024, EN AW-5083, EN AW-7075.

  • Tolerances on Dimensions
    The standard specifies precise tolerances for the following key dimensions:

    • Width across flats: Tolerances vary by alloy group and size, ranging from ±0.22 mm for small Group I bars to ±1.7 mm for the largest Group II bars.
    • Corner radii: Maximum allowable corner radii range from 1.5 mm to 5.0 mm depending on bar size.
    • Length: Fixed length bars have defined tolerance brackets depending on length ranges (up to 2,000 mm, 2,000–5,000 mm, over 5,000 mm).
    • Squareness of cut ends: Must be within half the fixed-length tolerance.

  • Tolerances on Form
    Form tolerances ensure the geometric integrity of hexagonal bars for precision engineering applications:

    • Straightness: Limits localised kink and general deviation per meter of length, essential for structural and machining performance.
    • Convexity and concavity: Address allowable deviations from flatness across the bar faces and are included within width tolerances.
    • Twist: Defined tolerances regulate the allowable rotational distortion over the length of the bar to maintain dimensional stability.

Applications

SIST EN 755-6:2008 is crucial for manufacturers, suppliers, and purchasers of extruded aluminium hexagonal bars used in various sectors including:

  • Mechanical engineering and manufacturing – where precision tolerances impact component fit and function.
  • Construction and architectural applications – for structural components requiring consistent dimensions and form stability.
  • Automotive and aerospace industries – where material integrity and adherence to strict tolerances affect safety and performance.
  • General engineering and fabrication – for machining parts with hexagonal cross sections that demand tight control on dimensions.

Adherence to SIST EN 755-6:2008 ensures reliable, consistent quality products that meet international standards for dimensional accuracy and form, reducing rework and improving interoperability of parts.

Related Standards

SIST EN 755-6:2008 is part of the EN 755 family of standards concerning extruded aluminium products:

  • EN 755-1: Technical conditions for inspection and delivery
  • EN 755-2: Mechanical properties of extruded products
  • EN 755-3 to EN 755-5: Tolerances for round, square, and rectangular bars
  • EN 755-7 and EN 755-8: Seamless and porthole tubes
  • EN 755-9: Profiles, tolerances on dimensions and form

Additionally, the temper designations referenced correspond to EN 515: Aluminium and aluminium alloys - Wrought products - Temper designations.

Keywords: EN 755-6, aluminium hexagonal bars, extruded aluminium alloys, dimension tolerances, form tolerances, extruded profiles, aluminium standards, CEN aluminium standards, aluminium bar tolerances, aluminium alloy extrusion, hexagonal aluminium bar specifications, engineering aluminium bars.

Frequently Asked Questions

SIST EN 755-6:2008 is a standard published by the Slovenian Institute for Standardization (SIST). Its full title is "Aluminium and aluminium alloys - Extruded rod/bar, tube and profiles - Part 6: Hexagonal bars, tolerances on dimensions and form". This standard covers: This document specifies the dimension and form tolerances for aluminium and aluminium alloy extruded hexagonal bars having widths across flats in the range from 10 mm up to 220 mm. The temper designations used in this part are according to EN 515.

This document specifies the dimension and form tolerances for aluminium and aluminium alloy extruded hexagonal bars having widths across flats in the range from 10 mm up to 220 mm. The temper designations used in this part are according to EN 515.

SIST EN 755-6:2008 is classified under the following ICS (International Classification for Standards) categories: 77.150.10 - Aluminium products. The ICS classification helps identify the subject area and facilitates finding related standards.

SIST EN 755-6:2008 has the following relationships with other standards: It is inter standard links to SIST EN 755-6:1998. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.

SIST EN 755-6:2008 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

Standards Content (Sample)


SLOVENSKI STANDARD
01-maj-2008
1DGRPHãþD
SIST EN 755-6:1998
Aluminij in aluminijeve zlitine - Iztiskane palice/drogovi, cevi in profili - 6. del:
Palice s šesterokotnim prerezom, tolerance mer in oblike
Aluminium and aluminium alloys - Extruded rod/bar, tube and profiles - Part 6:
Hexagonal bars, tolerances on dimensions and form
Aluminium und Aluminiumlegierungen - Stranggepresste Stangen, Rohre und Profile -
Teil 6: Sechskantstangen, Grenzabmaße und Formtoleranzen
Aluminium et alliages d'aluminium - Barres, tubes et profilés filés - Partie 6 : Barres
hexagonales, tolérances sur dimensions et forme
Ta slovenski standard je istoveten z: EN 755-6:2008
ICS:
77.150.10
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN 755-6
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2008
ICS 77.150.10 Supersedes EN 755-6:1995
English Version
Aluminium and aluminium alloys - Extruded rod/bar, tube and
profiles - Part 6: Hexagonal bars, tolerances on dimensions and
form
Aluminium et alliages d'aluminium - Barres, tubes et Aluminium und Aluminiumlegierungen - Stranggepresste
profilés filés - Partie 6: Barres hexagonales, tolérances sur Stangen, Rohre und Profile - Teil 6: Sechskantstangen,
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 755-6:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3
1 Scope.5
2 Alloy groups.5
3 Tolerances on dimensions .5
3.1 Width across flats.5
3.2 Corner radii.6
3.3 Length.6
3.4 Squareness of cut ends .7
4 Tolerances on form.7
4.1 Straightness.7
4.2 Convexity-Concavity.8
4.3 Twist.8
Bibliography .10

Foreword
This document (EN 755-6:2008) 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 755-6:1995.
Within its programme of work, Technical committee CEN/TC 132 entrusted CEN/TC 132/WG 5 "Extruded and
drawn products" to revise EN 755-6:1995.
The following technical modifications have been introduced during the revision:
 Clause 2: Alloys EN AW-3102, EN AW-6008, EN AW-6010A, EN AW-6014, EN AW-6023, EN AW-6360,
EN AW-6262A, EN AW-6065 and EN AW-6182 are added in Group I
 Clause 2: Alloys EN AW-5049, EN AW-7108, EN AW-7108A and EN AW-7021 are added in Group II
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 doc
...

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