EN ISO 21920-2:2022

Geometrical product specifications (GPS) - Surface texture: Profile - Part 2: Terms, definitions and surface texture parameters (ISO 21920-2:2021, Corrected version 2022-06)

This document specifies terms, definitions and parameters for the determination of surface texture by profile methods.
NOTE 1    The main changes to previous ISO profile documents are described in Annex I.
NOTE 2    An overview of profile and areal standards in the GPS matrix model is given in Annex J.
NOTE 3    The relation of this document to the GPS matrix model is given in Annex K.

Geometrische Produktspezifikation (GPS) - Oberflächenbeschaffenheit: Profile - Teil 2: Begriffe und Kenngrößen für die Oberflächenbeschaffenheit (ISO 21920 2:2021, korrigierte Fassung 2022-06)

Dieses Dokument legt Begriffe und Parameter für die Bestimmung der Oberflächenbeschaffenheit nach dem Tastschnittverfahren fest.
ANMERKUNG 1 Die wesentlichen Änderungen an früheren ISO-Profildokumenten werden in Anhang I beschrieben.
ANMERKUNG 2 Anhang J enthält einen Überblick über Normen zu profilhaften und flächenhaften Oberflächenbeschaffenheiten im GPS-Matrix-Modell.
ANMERKUNG 3 Anhang K enthält den Zusammenhang zwischen diesem Dokument und dem GPS-Matrix-Modell.

Spécification géométrique des produits (GPS) - État de surface: Méthode du profil - Partie 2: Termes, définitions et paramètres d'état de surface (ISO 21920-2:2021, Version corrigée 2022-06)

Le présent document spécifie les termes, définitions et paramètres applicables à la détermination de l’état de surface au moyen de méthodes de profil.
NOTE 1        Les principales modifications apportées aux précédents documents sur les profils ISO sont décrites à l'Annexe I.
NOTE 2        Une vue d'ensemble des normes de profil et des normes de surface dans le modèle matriciel GPS est donnée à l'Annexe J.
NOTE 3        La relation entre le présent document et le modèle de matrice GPS est donnée à l'Annexe K.

Specifikacija geometrijskih veličin izdelka (GPS) - Tekstura površine: profil - 2. del: Izrazi, definicije in parametri teksture površine (ISO 21920-2:2021, popravljena različica 2022-06)

Ta dokument določa izraze, definicije in parametre za ugotavljanje teksture površine s profilnimi metodami.
OPOMBA 1: Glavne spremembe prejšnjih dokumentov o profilu ISO so opisane v dodatku I.
OPOMBA 2: Pregled standardov o profilnih in ploskovnih metodah v matričnem modelu GPS je podan v dodatku J.
OPOMBA 3: Povezava tega dokumenta z matričnim modelom GPS je podana v dodatku K.

General Information

• Status: Published
• Publication Date: 18-Jan-2022
• Withdrawal Date: 30-Jul-2022
• ICS: 01.040.17 - Metrology and measurement. Physical phenomena (Vocabularies)
• ICS: 17.040.40 - Geometrical Product Specification (GPS)
• Technical Committee: CEN/TC 290 - Dimensional and geometrical product specification and verification
• Drafting Committee: CEN/TC 290 - Dimensional and geometrical product specification and verification
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 19-Jan-2022
• Completion Date: 19-Jan-2022
• Ref Project: SIST EN ISO 21920-2:2022 - Geometrical product specifications (GPS) - Surface texture: Profile - Part 2: Terms, definitions and surface texture parameters (ISO 21920-2:2021, Corrected version 2022-06)

Relations

• Replaces: EN ISO 12085:1997 - Geometrical product specification (GPS) - Surface texture: Profile method - Motif parameters (ISO 12085:1996)
• Effective Date: 08-Jun-2022
• Replaces: EN ISO 4287:1998/AC:2008 - Geometrical product specifications (GPS) - Surface texture: Profile method - Terms, definitions and surface texture parameters (ISO 4287:1997/Cor 1:1998/Cor 2:2005)
• Effective Date: 26-Jan-2022
• Replaces: EN ISO 12085:1997/AC:2008 - Geometrical product specification (GPS) - Surface texture: Profile method - Motif parameters (ISO 12085:1996/Cor 1:1998)
• Effective Date: 26-Jan-2022
• Replaces: EN ISO 4287:1998 - Geometrical product specifications (GPS) - Surface texture: Profile method - Terms, definitions and surface texture parameters (ISO 4287:1997)
• Effective Date: 26-Jan-2022
• Replaces: EN ISO 4287:1998/A1:2009 - Geometrical Product Specifications (GPS) - Surface texture: Profile method - Terms, definitions and surface texture parameters - Amendment 1: Peak count number (ISO 4287:1997/Amd 1:2009)
• Effective Date: 26-Jan-2022
• Replaces: EN ISO 13565-3:2000 - Geometrical Product Specifications (GPS) - Surface texture: Profile method; surfaces having stratified functional properties - Part 3: Height characterization using the material probability curve (ISO 13565-3:1998)
• Effective Date: 30-Nov-2016
• Replaces: EN ISO 13565-2:1997 - Geometrical product specifications (GPS) - Surface texture: Profile method; surfaces having stratified functional properties - Part 2: Height characterization using the linear material ratio curve (ISO 13565-2:1996)
• Effective Date: 30-Nov-2016

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2022
Nadomešča:
SIST EN ISO 12085:2000
SIST EN ISO 12085:2000/AC:2008
SIST EN ISO 13565-2:2000
SIST EN ISO 13565-3:2002
SIST EN ISO 4287:2000
SIST EN ISO 4287:2000/A1:2011
SIST EN ISO 4287:2000/AC:2008
Specifikacija geometrijskih veličin izdelka (GPS) - Tekstura površine: profil - 2. del:
Izrazi, definicije in parametri teksture površine (ISO 21920-2:2021)
Geometrical product specifications (GPS) - Surface texture: Profile - Part 2: Terms,
definitions and surface texture parameters (ISO 21920-2:2021)
Geometrische Produktspezifikation (GPS) - Oberflächenbeschaffenheit: Profile - Teil 2:
Begriffe und Parameter für die Oberflächenbeschaffenheit (ISO 21920-2:2021)
Spécification géométrique des produits (GPS) - État de surface: Méthode du profil -
Partie 2: Termes, définitions et paramètres d'état de surface (ISO 21920-2:2021)
Ta slovenski standard je istoveten z: EN ISO 21920-2:2022
ICS:
01.040.17 Meroslovje in merjenje. Metrology and measurement.
Fizikalni pojavi (Slovarji) Physical phenomena
(Vocabularies)
17.040.20 Lastnosti površin Properties of surfaces
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 21920-2
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2022
EUROPÄISCHE NORM
ICS 01.040.17; 17.040.40 Supersedes EN ISO 12085:1997, EN ISO 4287:1998,
EN ISO 13565-2:1997, EN ISO 13565-3:2000, EN ISO
4287:1998/A1:2009, EN ISO 4287:1998/AC:2008, EN
ISO 12085:1997/AC:2008
English Version
Geometrical product specifications (GPS) - Surface texture:
Profile - Part 2: Terms, definitions and surface texture
parameters (ISO 21920-2:2021)
Spécification géométrique des produits (GPS) - État de Geometrische Produktspezifikation (GPS) -
surface: Méthode du profil - Partie 2: Termes, Oberflächenbeschaffenheit: Profile - Teil 2: Begriffe
définitions et paramètres d'état de surface (ISO 21920- und Parameter für die Oberflächenbeschaffenheit (ISO
2:2021) 21920-2:2021)
This European Standard was approved by CEN on 27 November 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21920-2:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 21920-2:2022) has been prepared by Technical Committee ISO/TC 213
"Dimensional and geometrical product specifications and verification" in collaboration with Technical
Committee CEN/TC 290 “Dimensional and geometrical product specification and verification” 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 July 2022, and conflicting national standards shall be
withdrawn at the latest by July 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 ISO 12085:1997, EN ISO 4287:1998, EN ISO 13565-2:1997 and
EN ISO 13565-3:2000.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, 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.
Endorsement notice
The text of ISO 21920-2:2021 has been approved by CEN as EN ISO 21920-2:2022 without any
modification.
INTERNATIONAL ISO
STANDARD 21920-2
First edition
2021-12
Geometrical product specifications
(GPS) — Surface texture: Profile —
Part 2:
Terms, definitions and surface texture
parameters
Spécification géométrique des produits (GPS) — État de surface:
Méthode du profil —
Partie 2: Termes, définitions et paramètres d’état de surface
Reference number
ISO 21920-2:2021(E)
ISO 21920-2:2021(E)
© ISO 2021
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]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 21920-2:2021(E)
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 General terms . 1
3.2 Geometrical parameter terms . 10
3.3 Geometrical feature terms . . 14
4 Field parameters .22
4.1 General .22
4.2 Height parameters. 22
4.2.1 General .22
4.2.2 Arithmetic mean height .22
4.2.3 Root mean square height . 22
4.2.4 Skewness . 22
4.2.5 Kurtosis . 22
4.2.6 Total height . 23
4.2.7 Maximum height per section . 23
4.3 Spatial parameters . 24
4.3.1 General . 24
4.3.2 Autocorrelation length. 24
4.3.3 Dominant spatial wavelength . 24
4.4 Hybrid parameters . . . 25
4.4.1 General . 25
4.4.2 Root mean square gradient . 25
4.4.3 Arithmetic mean of absolute gradient . 25
4.4.4 Maximum absolute gradient . 25
4.4.5 Developed length . 25
4.4.6 Developed length ratio .26
4.5 Material ratio functions and related parameters . 26
4.5.1 Material ratio functions .26
4.5.2 Material ratio parameters. 31
4.5.3 Parameters for stratified surfaces using the material ratio curve .33
4.5.4 Parameters for stratified surfaces using the material probability curve .35
4.5.5 Volume parameters .36
5 Feature parameters .38
5.1 Parameters based on peak heights and pit depths .38
5.1.1 General .38
5.1.2 Maximum peak height .39
5.1.3 Mean peak height . 39
5.1.4 Maximum pit depth .39
5.1.5 Mean pit depth .
...

SLOVENSKI STANDARD
01-marec-2022
Nadomešča:
SIST EN ISO 12085:2000
SIST EN ISO 12085:2000/AC:2008
SIST EN ISO 13565-2:2000
SIST EN ISO 13565-3:2002
SIST EN ISO 4287:2000
SIST EN ISO 4287:2000/A1:2011
SIST EN ISO 4287:2000/AC:2008
Specifikacija geometrijskih veličin izdelka (GPS) - Tekstura površine: profil - 2. del:
Izrazi, definicije in parametri teksture površine (ISO 21920-2:2021, popravljena
različica 2022-06)
Geometrical product specifications (GPS) - Surface texture: Profile - Part 2: Terms,
definitions and surface texture parameters (ISO 21920-2:2021, Corrected version 2022-
06)
Geometrische Produktspezifikation (GPS) - Oberflächenbeschaffenheit: Profile - Teil 2:
Begriffe und Parameter für die Oberflächenbeschaffenheit (ISO 21920-2:2021,
korrigierte Fassung 2022-06)
Ta slovenski standard je istoveten z: EN ISO 21920-2:2022
ICS:
01.040.17 Meroslovje in merjenje. Metrology and measurement.
Fizikalni pojavi (Slovarji) Physical phenomena
(Vocabularies)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 21920-2
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2022
EUROPÄISCHE NORM
ICS 01.040.17; 17.040.40 Supersedes EN ISO 12085:1997, EN ISO 13565-
2:1997, EN ISO 13565-3:2000, EN ISO 4287:1998
English Version
Geometrical product specifications (GPS) - Surface texture:
Profile - Part 2: Terms, definitions and surface texture
parameters (ISO 21920-2:2021, Corrected version 2022-06)
Spécification géométrique des produits (GPS) - État de Geometrische Produktspezifikation (GPS) -
surface: Méthode du profil - Partie 2: Termes, Oberflächenbeschaffenheit: Profile - Teil 2: Begriffe
définitions et paramètres d'état de surface (ISO 21920- und Parameter für die Oberflächenbeschaffenheit (ISO
2:2021, Version corrigée 2022-06) 21920-2:2021, korrigierte Fassung 2022-06)
This European Standard was approved by CEN on 27 November 2021.

This European Standard was corrected and reissued by the CEN-CENELEC Management Centre on 20 July 2022.

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, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATIO N

EUROPÄISCHES KOMITEE FÜR NORMUN G

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 21920-2:2022 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 21920-2:2022) has been prepared by Technical Committee ISO/TC 213
"Dimensional and geometrical product specifications and verification" in collaboration with Technical
Committee CEN/TC 290 “Dimensional and geometrical product specification and verification” 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 July 2022, and conflicting national standards shall be
withdrawn at the latest by July 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 ISO 12085:1997, EN ISO 4287:1998, EN ISO 13565-2:1997 and
EN ISO 13565-3:2000.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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, 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.
Endorsement notice
The text of ISO 21920-2:2021, Corrected version 2022-06 has been approved by CEN as EN ISO 21920-
2:2022 without any modification.

INTERNATIONAL ISO
STANDARD 21920-2
First edition
2021-12
Corrected version
2022-06
Geometrical product specifications
(GPS) — Surface texture: Profile —
Part 2:
Terms, definitions and surface texture
parameters
Spécification géométrique des produits (GPS) — État de surface:
Méthode du profil —
Partie 2: Termes, définitions et paramètres d’état de surface
Reference number
ISO 21920-2:2021(E)
ISO 21920-2:2021(E)
© ISO 2021
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]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 21920-2:2021(E)
Contents Page
Foreword .v
Introduction . vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 General terms . 1
3.2 Geometrical parameter terms . 10
3.3 Geometrical feature terms . . 14
4 Field parameters .22
4.1 General .22
4.2 Height parameters. 22
4.2.1 General .22
4.2.2 Arithmetic mean height .22
4.2.3 Root mean square height . 22
4.2.4 Skewness . 22
4.2.5 Kurtosis .22
4.2.6 Total height .23
4.2.7 Maximum height per section . 23
4.3 Spatial parameters . 24
4.3.1 General . 24
4.3.2 Autocorrelation length. 24
4.3.3 Dominant spatial wavelength . 24
4.4 Hybrid parameters . . . 25
4.4.1 General . 25
4.4.2 Root mean square gradient . 25
4.4.3 Arithmetic mean of absolute gradient . 25
4.4.4 Maximum absolute gradient . 25
4.4.5 Developed length . 25
4.4.6 Developed length ratio .26
4.5 Material ratio functions and related parameters . 26
4.5.1 Material ratio functions .26
4.5.2 Material ratio parameters. 31
4.5.3 Parameters for stratified surfaces using the material ratio curve .33
4.5.4 Parameters for stratified surfaces using the material probability curve . 35
4.5.5 Volume parameters .36
5 Feature parameters .38
5.1 Parameters based on peak heights and pit depths .38
5.1.1 General .38
5.1.2 Maximum peak height . 39
5.1.3 Mean peak height . 39
5.1.4 Maximum pit depth . 39
5.1.5 Mean pit depth .
...