SIST EN 603-3:2021

Aluminium and aluminium alloys - Wrought forging stock - Part 3: Tolerances on dimensions and form

This document specifies the tolerances on dimensions and form of wrought aluminium and aluminium alloy forging stock.
It applies to extruded and rolled products.

Aluminium und Aluminiumlegierungen - Stranggepresstes oder gewalztes Schmiedevormaterial - Teil 3: Grenzabmaße und Formtoleranzen

Dieses Dokument legt die Grenzabmaße und Formtoleranzen von stranggepresstem oder gewalztem Aluminium-Schmiedevormaterial und Schmiedevormaterial von Aluminiumlegierungen fest.
Es ist anzuwenden für stranggepresste oder gewalzte Produkte.

Aluminium et alliages d'aluminium - Produits corroyés destinés à la forge - Partie 3: Tolérances sur dimensions et forme

Le présent document spécifie les tolérances sur dimensions et forme des produits corroyés en aluminium et en alliages d'aluminium destinés à la forge.
Il s'applique aux produits filés et laminés.

Aluminij in aluminijeve zlitine - Gneteni surovci za kovanje - 3. del: Odstopki mer in tolerance oblike

General Information

• Status: Published
• Public Enquiry End Date: 19-Oct-2020
• Publication Date: 05-Oct-2021
• ICS: 77.150.10 - Aluminium products
• Technical Committee: INEK - Nonferrous metals
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 29-Sep-2021
• Due Date: 04-Dec-2021
• Completion Date: 06-Oct-2021
• Ref Project: EN 603-3:2021 - Aluminium and aluminium alloys - Wrought forging stock - Part 3: Tolerances on dimensions and form

Relations

• Replaces: SIST EN 603-3:2002 - Aluminium and aluminium alloys - Wrought forging stock - Part 3: Tolerances on dimensions and form
• Effective Date: 29-Sep-2021

Overview

EN 603-3:2021 (CEN) specifies the tolerances on dimensions and form for wrought aluminium and aluminium‑alloy forging stock. The standard applies to extruded and hot‑rolled products, defining acceptable limits for bars and plates used as forging raw material. It updates and supersedes previous editions and is intended for use across CEN member countries.

Key scope details:

• Applies to extruded round bars (diameter up to 320 mm), square bars (width up to 220 mm), rectangular bars (widths up to 600 mm, thickness up to 240 mm) and hot‑rolled plate (widths up to 3 500 mm, thicknesses 10–200 mm).
• Covers tolerances on geometry (diameter, width, thickness), form (ovality, straightness, flatness, twist, convexity/concavity), cut end perpendicularity and fixed/random length tolerances.
• Recognises alloy Groups I and II (manufacturing difficulty) and refers to chemical composition limits in EN 573-3.

Key Topics and Requirements

• Dimensional tolerances: Tables provide specific tolerances for diameters, widths and thicknesses. For example, small extruded round bars (≤18 mm) have a typical diameter tolerance around ±0.22 mm (Group I, normal).
• Form tolerances: Includes ovality (maximum = 50% of the diameter tolerance range), straightness, twist, corner radius and convexity/concavity rules. Straightness measurement is described (bar on horizontal baseplate with straightedge - see Figure in standard).
• Length and cut ends: Fixed length tolerances are specified (examples: small lengths +5 to +12 mm ranges depending on length) and perpendicularity of cut ends is limited (max deviation typically within half the fixed length tolerance).
• Manufacturing method effects: Tolerances vary with extrusion method (direct vs indirect) and die type (single‑hole vs multi‑hole). Group II alloys may permit tighter tolerances using indirect extrusion or single‑hole dies.
• Applicability and limits: For dimensions outside listed ranges, tolerances are by agreement between purchaser and supplier.

Applications and Users

EN 603-3:2021 is practical for:

• Forging stock suppliers and extruders/rollers setting production tolerances.
• Purchasers and procurement engineers specifying acceptable dimensional/form limits on orders and drawings.
• Quality control and inspection teams verifying conformance to tolerance tables and measurement procedures.
• Design and process engineers selecting appropriate alloys and manufacturing routes for forging feedstock.

Using the standard helps reduce disputes, ensure interchangeability of forging stock, and support consistent quality for downstream forging and manufacturing.

Related Standards

• EN 603-1 - Technical conditions for inspection and delivery (wrought forging stock)
• EN 603-2 - Mechanical properties of wrought forging stock
• EN 573-3 - Chemical composition and form of wrought products
• EN 12258-1 - Terms and definitions (aluminium products)

Keywords: EN 603-3:2021, aluminium forging stock tolerances, wrought forging stock tolerances, extruded aluminium tolerances, rolled aluminium plate tolerances, CEN standard.

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2021
Nadomešča:
SIST EN 603-3:2002
Aluminij in aluminijeve zlitine - Gneteni surovci za kovanje - 3. del: Odstopki mer in
tolerance oblike
Aluminium and aluminium alloys - Wrought forging stock - Part 3: Tolerances on
dimensions and form
Aluminium und Aluminiumlegierungen - Stranggepresstes oder gewalztes
Schmiedevormaterial - Teil 3: Grenzabmaße und Formtoleranzen
Aluminium et alliages d'aluminium - Produits corroyés destinés à la forge - Partie 3:
Tolérances sur dimensions et forme
Ta slovenski standard je istoveten z: EN 603-3:2021
ICS:
77.150.10 Aluminijski izdelki Aluminium products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 603-3
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2021
EUROPÄISCHE NORM
ICS 77.150.10 Supersedes EN 603-3:2000
English Version
Aluminium and aluminium alloys - Wrought forging stock -
Part 3: Tolerances on dimensions and form
Aluminium et alliages d'aluminium - Produits corroyés Aluminium und Aluminiumlegierungen -
destinés à la forge - Partie 3: Tolérances sur Stranggepresstes oder gewalztes Schmiedevormaterial
dimensions et forme - Teil 3: Grenzabmaße und Formtoleranzen
This European Standard was approved by CEN on 4 July 2021.

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-CENELEC 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-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 603-3:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Dimensional ranges . 5
5 Alloys . 5
5.1 Chemical composition . 5
5.2 Alloy groups . 5
6 Tolerances on dimensions and form . 6
6.1 General. 6
6.2 Extruded round bar . 7
6.2.1 Diameter . 7
6.2.2 Ovality . 7
6.2.3 Length. 8
6.2.4 Perpendicularity of cut ends. 8
6.2.5 Straightness . 8
6.3 Extruded square bar . 9
6.3.1 Width across flats . 9
6.3.2 Corner radius . 10
6.3.3 Perpendicularity . 11
6.3.4 Convexity - concavity . 12
6.3.5 Straightness . 12
6.3.6 Twist . 13
6.3.7 Length. 14
6.3.8 Perpendicularity of cut ends. 14
6.4 Extruded rectangular bar . 15
6.4.1 Thickness and width . 15
6.4.2 Corner radius . 18
6.4.3 Perpendicularity . 18
6.4.4 Convexity - concavity . 19
6.4.5 Straightness . 20
6.4.6 Twist . 21
6.4.7 Length . 22
6.4.8 Perpendicularity of cut ends . 23
6.5 Hot rolled plate . 23
6.5.1 Thickness . 23
6.5.2 Length and width . 23
6.5.3 Perpendicularity . 24
6.5.4 Flatness and lateral curvature . 25
Bibliography . 26

European foreword
This document (EN 603-3:2021) 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 March 2022, and conflicting national standards shall
be withdrawn at the latest by March 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 603-3:2000.
Compared to the previous edition, Table 20 has been modified.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
1 Scope
This document specifies the tolerances on dimensions and form of wrought aluminium and aluminium
alloy forging stock.
It applies to extruded and rolled products.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 573-3, Aluminium and aluminium alloys - Chemical composition and form of wrought products -
Part 3: Chemical composition and form of products
EN 603-1, Aluminium and aluminium alloys - Wrought forging stock - Part 1: Technical conditions for
inspection and delivery
EN 603-2, Aluminium and aluminium alloys - Wrought forging stock - Part 2: Mechanical properties
EN 12258-1, Aluminium and aluminium alloys - Terms and definitions - Part 1: General terms
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 12258-1 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
• IEC Electropedia: available at https://www.electropedia.org/
• ISO Online browsing platform: available at https://www.iso.org/obp
4 Dimensional ranges
The tolerances on dimensions and form expressed in this document cover extruded products of regular
cross-section in the form of round bars having diameters up to and including 320 mm, square bars
having width across flats up to and including 220 mm, rectangular bars having widths up to and
including 600 mm in thicknesses up to and including 240 mm and hot rolled plate in widths up to and
including 3 500 mm in thicknesses from 10 mm up to and including 200 mm.
Tolerances on dimensions and form of such products in excess of these ranges shall be subject to
agreement between supplier and purchaser and stated on the order or drawing.
5 Alloys
5.1 Chemical composition
The chemical composition limits of the alloys shall be as specified in EN 573-3.
5.2 Alloy groups
For the purposes of this document, the alloys are divided into two groups which correspond to varying
difficulty when manufacturing the extruded forging stock. The division into Group I and Group II of
these alloys is specified in Table 1.
The division into Class A and Class B alloys shall be as specified in EN 573-3. Class A covers aluminium
and aluminium alloys produced in large volume as wrought forging stock for which mechanical
properties are specified in EN 603-2. Class B covers aluminium and aluminium alloys produced in
limited volume as wrought forging stock for which mechanical properties are not specified.
Table 1 — Alloy Groups
Alloy Group I (extrude with ease) Alloy Group II (difficult to extrude)
Alloy designation Class Alloy designation Class
EN AW-1050A [Al 99,5] B EN AW-2011 [Al Cu6BiPb] B
EN AW-2014 [Al Cu4SiMg] A
EN AW-6005A [Al SiMg(A)] B EN AW-2017A [Al CuMgSi(A)] B
EN AW-2618A [Al Cu2Mg1,5Ni] B
EN AW-6060 [Al MgSi] B EN AW-2219 [Al Cu6Mn] B
EN AW-2024 [Al Cu4Mg1] A
EN AW-6061 [Al Mg1SiCu] B EN AW-2031 [Al Cu2,5NiMg] B
EN AW-4032 [Al Si12,5MgCuNi] B
EN AW-6082 [Al Si1MgMn] A EN AW-5454 [Al Mg3Mn] B
EN AW-5754 [Al Mg3] A
EN AW-5019 [Al Mg5] B
EN AW-5083 [Al Mg4,5Mn0,7] A
EN AW-7010 [Al Zn6MgCu] B
EN AW-7012 [Al Zn6Mg2Cu] B
EN AW-7020 [Al Zn4,5Mg1] B
EN AW-7075 [Al Zn5,5MgCu] A
Other alloys shall be grouped as follows:
Alloy Group I:
— unalloyed aluminium;
— alloys Al Mn;
— alloys Al Mg with a maximum of 2,8 % Mg;
— alloys Al MgSi.
Alloy Group II:
— alloys Al Mg with more than 2,8 % Mg;
— alloys Al CuMg;
— alloys Al ZnMg.
6 Tolerances on dimensions and form
6.1 General
The technical conditions for inspection and delivery of wrought forging stock are specified in EN 603-1.
NOTE These products are normally supplied in the F temper as defined in EN 515.
6.2 Extruded round bar
6.2.1 Diameter
Tolerances on diameter shall be as specified in Table 2.
Tolerances on diameter can vary dependent on the method of extrusion (direct or indirect) and the type
of extrusion die used (single hole or multi hole).
With Group II alloys closer tolerances are possible when the indirect method of extrusion is employed
using either a single hole or multi hole die at the discretion of the supplier.
In diameters up to and including 120 mm, however, the forging requirement can demand restricted
tolerances combined with a more uniform material structure obtainable only with the use of a single
hole die. In such cases the purchaser shall specify this special requirement on the order.
Table 2 — Tolerances on diameter
Dimensions in millimetres
Diameter Tolerances
Alloy Group I Alloy Group II
Over Up to  Direct Indirect extrusion
extrusion
and
Normal tolerance Restricted tolerance
including
Single or Multi hole die Single hole die only
a
18 ±0,22 ±0,30 ±0,20 ±0,15
18 25 ±0,25 ±0,35 ±0,23 ±0,20
25 40 ±0,30 ±0,40 ±0,27 ±0,22
40 50 ±0,35 ±0,45 ±0,30 ±0,25
50 65 ±0,40 ±0,50 ±0,35 ±0,27
65 80 ±0,45 ±0,70 ±0,40 ±0,30
80 100 ±0,55 ±0,90 ±0,45 ±0,35
100 120 ±0,65 ±1,0 ±0,50 ±0,40
b
120 150 ±0,80 ±1,2 —
...