SIST EN ISO 898-3:2018

Mechanical properties of fasteners made of carbon steel and alloy steel - Part 3: Flat washers with specified property classes (ISO 898-3:2018)

This part of ISO 898 specifies mechanical and physical properties of flat washers, designed to be used in bolted joints in combination with bolts, screws, studs and nuts with a specified property class in accordance with ISO 898-1 and ISO 898-2.
Washers that conform to the requirements of this part of ISO 898 are evaluated at an ambient temperature range of 10 °C to 35 °C. These washers are used in applications at low or high temperatures up to a maximum temperature of + 300 °C.
This part of ISO 898 is applicable to the following flat captive and non-captive washers made of carbon steel, alloy steel, spring or alloy spring steel, with thickness from 0,2 mm to 12 mm:
- plain washers (with or without knurls/chamfers);
- square washers;
- square hole washers;
- shaped plates.
It does not specify requirements for such properties as:
- corrosion resistance;
- weldability.

Mechanische Eigenschaften von Verbindungselementen aus Kohlenstoffstahl und legiertem Stahl - Teil 3: Scheiben (ISO 898-3:2018)

Dieses Dokument legt mechanische und physikalische Eigenschaften von flachen Scheiben fest, die für Schraubverbindungen in Kombination mit Schrauben und Muttern entsprechend der in ISO 898-1 und ISO 898-2 festgelegten Festigkeitsklasse vorgesehen sind.
ANMERKUNG 1 Diese Arten von Scheiben können auch mit anderen Verbindungselementen verwendet werden, z. B. mit gewindefurchenden Schrauben.
Scheiben, die die Anforderungen dieses Dokumentes erfüllen, werden bei einem Raumtemperaturbereich von 10 °C bis 35 °C bewertet. Es könnte sein, dass sie bei erhöhten Temperaturen und/oder niedrigeren Temperaturen nicht die festgelegten mechanischen und physikalischen Eigenschaften beibehalten.
ANMERKUNG 2 Scheiben, die die Anforderungen dieses Dokumentes erfüllen, werden in Anwendungen im Bereich von −50 °C bis +150 °C verwendet. Für Temperaturen außerhalb dieses Bereiches und bis zu einer Höchsttemperatur von +300 °C wird den Benutzern empfohlen, bei der Ermittlung der geeigneten Auswahl oder bei kritischen Anwendun-gen einen erfahrenen Fachmann für Verbindungselemente hinzuzuziehen.
Dieses Dokument ist bei den folgenden flachen unverlierbaren und verlierbaren Scheiben aus Kohlenstoff-stahl oder legiertem Stahl mit einer Dicke von 0,2 mm bis 12 mm anwendbar:
— einfache Scheiben (mit oder ohne Rändelung, Rippen oder Fasen);
— Vierkantscheiben;
— Scheiben mit Vierkantloch;
— Formbleche.
Es legt keine Anforderungen an folgende Eigenschaften fest:
— Korrosionsbeständigkeit;
— Schweißbarkeit.

Caractéristiques mécaniques des fixations en acier au carbone et en acier allié - Partie 3: Rondelles de forme plane de classes de qualité spécifiées (ISO 898-3:2018)

Le présent document spécifie les caractéristiques mécaniques et physiques des rondelles de forme plane, conçues pour être utilisées dans des assemblages vissés en combinaison avec des vis, des goujons, des tiges filetées et des écrous de classes de qualité spécifiées conformément à l'ISO 898-1 et à l'ISO 898-2.
NOTE 1    Ces types de rondelles peuvent être utilisés également avec d'autres fixations, telles que les vis formant leur propre filetage.
Les rondelles conformes aux exigences du présent document sont évaluées dans la plage de température ambiante de 10 °C à 35 °C. Elles peuvent ne pas conserver les caractéristiques mécaniques et physiques spécifiées à des températures élevées et/ou à des températures basses.
NOTE 2    Les rondelles conformes aux exigences du présent document sont utilisées pour des applications dans la plage de température de − 50 °C à + 150 °C. Il est conseillé aux utilisateurs de consulter un spécialiste expérimenté en fixations pour des températures en dehors de cette plage et jusqu'à une température maximale de + 300 °C, afin de déterminer les choix appropriés, ou pour des applications critiques.
Le présent document s'applique aux rondelles de forme plane suivantes, imperdables ou libres, en acier au carbone ou en acier allié, d'épaisseur de 0,2 mm à 12 mm:
—          rondelles plates (striées ou non striées, crantées ou non crantées, ou avec ou sans chanfreins);
—          rondelles carrées;
—          rondelles à trou carré;
—          plaquettes de forme spéciale.
Il ne spécifie pas d'exigence pour les caractéristiques suivantes:
—          la résistance à la corrosion;
—          la soudabilité.

Mehanske lastnosti veznih elementov, narejenih iz ogljikovega jekla in jeklene zlitine - 3. del: Ploščate podložke z določenimi razredi trdnosti (ISO 898-3:2018)

Ta del standarda ISO 898 določa mehanske in fizikalne lastnosti ploščatih podložk, namenjenih za uporabo v vijačnih spojih v kombinaciji s sorniki, vijaki, zatiči ter maticami z določenim razredom trdnosti v skladu s standardoma ISO 898-1 in ISO 898-2. Podložke, skladne z zahtevami iz tega dela standarda ISO 898, so ocenjene pri sobni temperaturi od 10 °C do 35 °C. Te podložke se uporabljajo pri nizkih ali visokih temperaturah, pri čemer je najvišja temperatura 300 °C. Ta del standarda ISO 898 se uporablja za spodaj navedene ploščate robljene podložke in tiste, ki niso robljene, izdelane iz ogljikovega jekla, jeklene zlitine, vzmetnega jekla ali zlitine vzmetnega jekla, z debelino od 0,2 mm do 12 mm: – ploščate podložke (z rebričenjem/posnetji ali brez njih); – kvadrataste podložke; – podložke s kvadratno odprtino; – oblikovane plošče. Ta standard ne določa zahtev za lastnosti, kot sta: – korozijska odpornost; – varivost.

General Information

• Status: Published
• Public Enquiry End Date: 02-Apr-2017
• Publication Date: 10-Sep-2018
• ICS: 21.060.30 - Washers, locking elements
• Technical Committee: ISEL - Mechanical elements
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 26-Jul-2018
• Due Date: 30-Sep-2018
• Completion Date: 11-Sep-2018
• Ref Project: EN ISO 898-3:2018 - Mechanical properties of fasteners made of carbon steel and alloy steel - Part 3: Flat washers with specified property classes (ISO 898-3:2018)

Relations

• Amended By: SIST EN ISO 898-3:2018/A1:2021 - Mechanical properties of fasteners made of carbon steel and alloy steel - Part 3: Flat washers with specified property classes - Amendment 1 (ISO 898-3:2018/Amd 1:2020)
• Effective Date: 02-Oct-2019

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN ISO 898-3:2018
01-oktober-2018
0HKDQVNHODVWQRVWLYH]QLKHOHPHQWRYQDUHMHQLKL]RJOMLNRYHJDMHNODLQMHNOHQH
]OLWLQHGHO3ORãþDWHSRGORåNH]GRORþHQLPLUD]UHGLWUGQRVWL,62
Mechanical properties of fasteners made of carbon steel and alloy steel - Part 3: Flat
washers with specified property classes (ISO 898-3:2018)
Mechanische Eigenschaften von Verbindungselementen aus Kohlenstoffstahl und
legiertem Stahl - Teil 3: Scheiben (ISO 898-3:2018)
Caractéristiques mécaniques des fixations en acier au carbone et en acier allié - Partie
3: Rondelles de forme plane de classes de qualité spécifiées (ISO 898-3:2018)
Ta slovenski standard je istoveten z: EN ISO 898-3:2018
ICS:
21.060.30 Podložke, varovalni elementi Washers, locking elements
SIST EN ISO 898-3:2018 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 898-3:2018

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SIST EN ISO 898-3:2018


EN ISO 898-3
EUROPEAN STANDARD

NORME EUROPÉENNE

June 2018
EUROPÄISCHE NORM
ICS 21.060.20
English Version

Mechanical properties of fasteners made of carbon steel
and alloy steel - Part 3: Flat washers with specified
property classes (ISO 898-3:2018)
Caractéristiques mécaniques des fixations en acier au Mechanische Eigenschaften von
carbone et en acier allié - Partie 3: Rondelles de forme Verbindungselementen aus Kohlenstoffstahl und
plane de classes de qualité spécifiées (ISO 898-3:2018) legiertem Stahl - Teil 3: Flache Scheiben mit
festgelegten Festigkeitsklassen (ISO 898-3:2018)
This European Standard was approved by CEN on 16 May 2018.

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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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
© 2018 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 898-3:2018 E
worldwide for CEN national Members.

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SIST EN ISO 898-3:2018
EN ISO 898-3:2018 (E)
Contents Page
European foreword . 3

2

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SIST EN ISO 898-3:2018
EN ISO 898-3:2018 (E)
European foreword
This document (EN ISO 898-3:2018) has been prepared by Technical Committee ISO/TC 2 "Fasteners"
in collaboration with Technical Committee CEN/TC 185 “Fasteners” the secretariat of which is held by
BSI.
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 2018, and conflicting national standards
shall be withdrawn at the latest by December 2018.
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.
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,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Endorsement notice
The text of ISO 898-3:2018 has been approved by CEN as EN ISO 898-3:2018 without any modification.


3

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SIST EN ISO 898-3:2018

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SIST EN ISO 898-3:2018
INTERNATIONAL ISO
STANDARD 898-3
First edition
2018-05
Mechanical properties of fasteners
made of carbon steel and alloy steel —
Part 3:
Flat washers with specified property
classes
Caractéristiques mécaniques des fixations en acier au carbone et en
acier allié —
Partie 3: Rondelles de forme plane de classes de qualité spécifiées
Reference number
ISO 898-3:2018(E)
©
ISO 2018

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SIST EN ISO 898-3:2018
ISO 898-3:2018(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

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SIST EN ISO 898-3:2018
ISO 898-3:2018(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols . 2
5 Designation system for property classes of washers and combination with property
classes of bolts, screws, studs and nuts . 2
6 Materials . 3
7 Mechanical and physical properties . 4
8 Test methods . 5
8.1 Hardness test . 5
8.1.1 General. 5
8.1.2 Hardness test on the washer bearing surface. 6
8.1.3 Hardness determined on a transverse radial section through the washer . 9
8.2 Decarburization test .10
8.2.1 General.10
8.2.2 Microscopic method . .10
8.2.3 Hardness method .11
8.3 Carburization test .12
8.3.1 General.12
8.3.2 Test procedure .12
8.3.3 Requirements .12
8.4 Retempering test .12
8.4.1 General.12
8.4.2 Test procedure .12
8.4.3 Requirements .12
9 Marking .13
9.1 General .13
9.2 Marking of washers .13
9.3 Marking of packages .13
Annex A (normative) Ductility test for washers of property class 380HV .14
Bibliography .17
© ISO 2018 – All rights reserved iii

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SIST EN ISO 898-3:2018
ISO 898-3:2018(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 2, Fasteners.
A list of all parts in the ISO 898 series can be found on the ISO website.
iv © ISO 2018 – All rights reserved

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SIST EN ISO 898-3:2018
ISO 898-3:2018(E)

Introduction
ISO 898 consists of the following parts, under the general title “Mechanical properties of fasteners made
of carbon steel and alloy steel”:
— Part 1: Bolts, screws and studs with specified property classes — Coarse thread and fine pitch thread
— Part 2: Nuts with specified property classes — Coarse thread and fine pitch thread
— Part 5: Set screws and similar threaded fasteners with specified hardness classes — Coarse thread and
fine pitch thread
— Part 7: Torsional test and minimum torques for bolts and screws with nominal diameters 1 mm to 10 mm
This document in the ISO 898 series provides a single point of reference for flat washers, in order to
standardize market expectations for users, distributors and manufacturers.
This document only deals with flat washers made of carbon steel or alloy steel.
Washers made of stainless steel are not addressed in this document due to their different characteristics
and test methods.
© ISO 2018 – All rights reserved v

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SIST EN ISO 898-3:2018

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SIST EN ISO 898-3:2018
INTERNATIONAL STANDARD ISO 898-3:2018(E)
Mechanical properties of fasteners made of carbon steel
and alloy steel —
Part 3:
Flat washers with specified property classes
1 Scope
This document specifies mechanical and physical properties of flat washers, designed to be used
in bolted joints in combination with bolts, screws, studs and nuts with a specified property class in
accordance with ISO 898-1 and ISO 898-2.
NOTE 1 These types of washers can also be used with other fasteners such as screws forming their own
mating thread.
Washers that conform to the requirements of this document are evaluated at an ambient temperature
range of 10 °C to 35 °C. They might not retain the specified mechanical and physical properties at
elevated temperatures and/or lower temperatures.
NOTE 2 Washers conforming to the requirements of this document are used in applications ranging from
−50 °C to +150 °C. Users are advised to consult an experienced fastener expert for temperatures outside this
range and up to a maximum temperature of +300 °C when determining appropriate choices, or for critical
applications.
This document is applicable to the following flat captive and non-captive washers made of carbon steel
or alloy steel, with thickness from 0,2 mm to 12 mm:
— plain washers (with or without knurls, ribs or chamfers);
— square washers;
— square hole washers;
— shaped plates.
It does not specify requirements for the following properties:
— corrosion resistance;
— weldability.
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.
ISO 1891-4, Fasteners — Terminology — Part 4: Controls, inspection, delivery, acceptance and quality
ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method
ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method
ISO 10644, Screw and washer assemblies made of steel with plain washers — Washer hardness classes 200
HV and 300 HV
© ISO 2018 – All rights reserved 1

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SIST EN ISO 898-3:2018
ISO 898-3:2018(E)

ISO 10669, Plain washers for tapping screw and washer assemblies — Normal and large series —
Product grade A
ISO 10673, Plain washers for screw and washer assemblies — Small, normal and large series — Product
grade A
ISO 10684, Fasteners — Hot dip galvanized coatings
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https: //www .iso .org/obp
— IEC Electropedia: available at http: //www .electropedia .org/
4 Symbols
For the purposes of this document, the following symbols apply.
d clearance hole, mm
1
d outside diameter, mm
2
F force, N
G depth of the complete decarburization, mm
r radius of the supporting part and pressure part for the ductility test, mm
t nominal thickness of flat washer, mm
t effective thickness of the material measured on the washer, mm
eff
α angle of the supporting part and pressure part for the ductility test, °
5 Designation system for property classes of washers and combination with
property classes of bolts, screws, studs and nuts
The symbol for property classes of washers is composed of two parts:
— the number to the left is the minimum Vickers hardness value in accordance with Table 3;
— the letters HV to the right represent Vickers hardness.
EXAMPLE A steel flat washer with a minimum Vickers hardness of 200 according to Table 3 has the property
class designation 200HV.
The designation system of this document may be applied for sizes outside its scope (e.g. for washers with
thickness t > 12 mm) provided all applicable requirements in accordance with Tables 2 and 3 are met.
Although a great number of property classes is specified in this document, this does not mean that
all property classes are appropriate for all washers and/or for all bolts/nuts/washers assemblies.
The combination of property classes for flat washers with bolts, screws, studs and nuts is specified in
Table 1.
2 © ISO 2018 – All rights reserved

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SIST EN ISO 898-3:2018
ISO 898-3:2018(E)

Table 1 — Combination of property classes of flat washers (e.g. plain washers) with property
classes of bolts, screws, studs and nuts
Threaded fasteners in accordance with ISO 898-1
Mating property classes for flat washers
and ISO 898-2
Property classes
a a b,c
100HV 200HV 300HV 380HV
Bolts, screws and studs Regular and high nuts
e e e e
4.6, 4.8, 5.6, 5.8 5 RC
d,e e e e
6.8 6 RC
f e e e
8.8 8 RC
f d, e e e
9.8, 10.9 10 RC
f f d,e e
12.9, 12.9 12 RC
Key
RC = recommended combination.
a
  Only 200HV and 300HV property classes are standardized for captive washers in bolts and washers assemblies; they
shall be in accordance with ISO 10644 or ISO 10673.
b
  Property class 380HV is currently not included in existing ISO product standards; if required, the use of this property
class shall be agreed between the purchaser and the supplier.
c
  The design of the bolted joint with a washer with property class 380HV shall prevent bending effect and tensile stress
in the washer, especially with regard to slotted and enlarged holes.
d d
  RC represents the optimal combination; however, other combinations marked with footnote may also be used
provided joint design and/or installation conditions are checked.
e
The combinations above the stepped thick line can be used for bolted joints.
f
The combinations under the stepped thick line (grey zone) shall not be used.
For screws forming their own mating thread and screws for soft material (e.g. plastic, wood …),
combination with washer property classes shall be determined based on the intended appli
...