Geometrical product specifications (GPS) - Surface texture: Areal - Part 1: Indication of surface texture (ISO 25178-1:2016)

ISO 25178-1:2016 specifies the rules for indication of areal surface texture in technical product documentation (e.g. drawings, specifications, contracts, reports) by means of graphical symbols.

Geometrische Produktspezifikation (GPS) - Oberflächenbeschaffenheit: Flächenhaft - Teil 1: Angabe von Oberflächenbeschaffenheit (ISO 25178-1:2016)

Spécification géométrique des produits (GPS) - État de surface: Surfacique - Partie 1: Indication des états de surface (ISO 25178-1:2016)

ISO 25178-1:2016 spécifie les règles pour l'indication des états de surface surfaciques dans la documentation technique de produits (par exemple dessins, spécifications, contrats, rapports) au moyen de symboles graphiques.

Specifikacija geometrijskih veličin izdelka (GPS) - Tekstura površine: ravna - 1. del: Označevanje površinskih tekstur (ISO 25178-1:2016)

Ta del standarda ISO 25178 določa pravila za označevanje površinskih tekstur v tehnični dokumentaciji izdelkov (npr. risbe, specifikacije, pogodbe, poročila) z grafičnimi simboli.

General Information

Status
Published
Publication Date
19-Apr-2016
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
20-Apr-2016
Completion Date
20-Apr-2016

Buy Standard

Standard
EN ISO 25178-1:2016
English language
34 pages
sale 10% off
Preview
sale 10% off
Preview

e-Library read for
1 day

Standards Content (sample)

SLOVENSKI STANDARD
SIST EN ISO 25178-1:2016
01-julij-2016

6SHFLILNDFLMDJHRPHWULMVNLKYHOLþLQL]GHOND *36 7HNVWXUDSRYUãLQHUDYQD

GHO2]QDþHYDQMHSRYUãLQVNLKWHNVWXU ,62

Geometrical product specifications (GPS) - Surface texture:Areal - Part 1: Indication of

surface texture (ISO 25178-1:2016)

Geometrische Produktspezifikation (GPS) - Oberflächenbeschaffenheit: Flächenhaft -

Teil 1: Eintragung von Oberflächenbeschaffenheit (ISO 25178-1:2016)

Spécification géométrique des produits (GPS) - État de surface: Surfacique - Partie 1:

Indication des états de surface (ISO 25178-1:2016)
Ta slovenski standard je istoveten z: EN ISO 25178-1:2016
ICS:
17.040.20 Lastnosti površin Properties of surfaces
17.040.40 6SHFLILNDFLMDJHRPHWULMVNLK Geometrical Product
YHOLþLQL]GHOND *36 Specification (GPS)
SIST EN ISO 25178-1:2016 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

---------------------- Page: 1 ----------------------
SIST EN ISO 25178-1:2016
---------------------- Page: 2 ----------------------
SIST EN ISO 25178-1:2016
EN ISO 25178-1
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2016
EUROPÄISCHE NORM
ICS 17.040.30
English Version
Geometrical product specifications (GPS) - Surface texture:
Areal - Part 1: Indication of surface texture (ISO 25178-
1:2016)

Spécification géométrique des produits (GPS) - État de Geometrische Produktspezifikation (GPS) -

surface: Surfacique - Partie 1: Indication des états de Oberflächenbeschaffenheit: Flächenhaft - Teil 1:

surface (ISO 25178-1:2016) Eintragung von Oberflächenbeschaffenheit (ISO
25178-1:2016)
This European Standard was approved by CEN on 3 October 2015.

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, 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: Avenue Marnix 17, B-1000 Brussels

© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 25178-1:2016 E

worldwide for CEN national Members.
---------------------- Page: 3 ----------------------
SIST EN ISO 25178-1:2016
EN ISO 25178-1:2016 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

---------------------- Page: 4 ----------------------
SIST EN ISO 25178-1:2016
EN ISO 25178-1:2016 (E)
European foreword

This document (EN ISO 25178-1:2016) 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 October 2016, and conflicting national standards shall

be withdrawn at the latest by October 2016.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN [and/or CENELEC] 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, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom.
Endorsement notice

The text of ISO 25178-1:2016 has been approved by CEN as EN ISO 25178-1:2016 without any

modification.
---------------------- Page: 5 ----------------------
SIST EN ISO 25178-1:2016
---------------------- Page: 6 ----------------------
SIST EN ISO 25178-1:2016
INTERNATIONAL ISO
STANDARD 25178-1
First edition
2016-04-15
Geometrical product specifications
(GPS) — Surface texture: Areal —
Part 1:
Indication of surface texture
Spécification géométrique des produits (GPS) — État de surface:
Surfacique —
Partie 1: Indication des états de surface
Reference number
ISO 25178-1:2016(E)
ISO 2016
---------------------- Page: 7 ----------------------
SIST EN ISO 25178-1:2016
ISO 25178-1:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland

All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
---------------------- Page: 8 ----------------------
SIST EN ISO 25178-1:2016
ISO 25178-1:2016(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ................................................................................................................................................................................................................................vi

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Graphical symbols for the indication of areal surface texture ............................................................................. 1

5 Composition of complete graphical symbol for areal surface texture ..........................................................3

5.1 General ........................................................................................................................................................................................................... 3

5.2 Positions of surface texture requirements ...................................................................................................................... 3

6 Indication of areal surface parameters ........................................................................................................................................ 4

6.1 Definition of the tolerance ............................................................................................................................................................ 4

6.2 Definition of the parameter ......................................................................................................................................................... 5

6.3 Indication of manufacturing method or related information ......................................................................... 5

6.4 Indication of surface lay .................................................................................................................................................................. 5

6.5 Indication of machining allowance ........................................................................................................................................ 7

6.6 Position on drawings and other technical product documentation.......................................................... 7

6.7 Proportions and dimensions of graphical symbols ................................................................................................. 7

6.8 Orientation of the evaluation area ......................................................................................................................................... 7

7 Coordinate system .............................................................................................................................................................................................. 7

8 Digital product definition data .............................................................................................................................................................. 8

Annex A (normative) Proportions and dimensions of graphical symbols ....................................................................9

Annex B (normative) Indications for unambiguous surface texture specifications ........................................11

Annex C (informative) Examples of indications of areal surface texture requirements .............................15

Annex D (informative) Recommended procedures for indication of intersection planes.........................19

Annex E (informative) ISO special specification elements for areal surface texture ......................................22

Annex F (informative) Relation to the GPS matrix model ............................................................................................................24

Bibliography .............................................................................................................................................................................................................................25

© ISO 2016 – All rights reserved iii
---------------------- Page: 9 ----------------------
SIST EN ISO 25178-1:2016
ISO 25178-1:2016(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. 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. 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. The committee responsible for this document is ISO/TC 213, Dimensional

and geometrical product specifications and verification.

This document was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical product

specifications and verification.

ISO 25178 consists of the following parts, under the general title Geometrical product specifications

(GPS) — Surface texture: Areal:
— Part 1: Indication of surface texture
— Part 2: Terms, definitions and surface texture parameters
— Part 3: Specification operators
— Part 6: Classification of methods for measuring surface texture
— Part 70: Physical measurement standards
— Part 71: Software measurement standards
— Part 72: XML file format x3p
— Part 601: Nominal characteristics of contact (stylus) instruments

— Part 602: Nominal characteristics of non-contact (confocal chromatic probe) instruments

— Part 603: Nominal characteristics of non-contact (phase shifting interferometric microscopy)

instruments

— Part 604: Nominal characteristics of non-contact (coherence scanning interferometry) instruments

— Part 605: Nominal characteristics of non-contact (point autofocus probe) instruments

— Part 606: Nominal characteristics of non-contact (focus variation) instruments

— Part 701: Calibration and measurement standards for contact (stylus) instruments

The following parts are planned:
— Part 4: Comparison rules
iv © ISO 2016 – All rights reserved
---------------------- Page: 10 ----------------------
SIST EN ISO 25178-1:2016
ISO 25178-1:2016(E)
— Part 5: Verification operators
— Part 600: Metrological characteristics for areal-topography measuring methods

— Part 607: Nominal characteristics of non-contact (confocal microscopy) instruments

— Part 700: Calibration and verification of metrological characteristics of areal-topography measuring

instruments

1) Part 600 is intended to contain provisions that are in common with the other 600-level parts of ISO 25178.

Once Part 600 has been submitted as a Final Draft International Standard, provisions of the other 600-level parts

that are then redundant with provisions of Part 600 will be removed from them.
© ISO 2016 – All rights reserved v
---------------------- Page: 11 ----------------------
SIST EN ISO 25178-1:2016
ISO 25178-1:2016(E)
Introduction

This part of the ISO 25178- series standards is a geometrical product specification standard and is to

be regarded as a general GPS standard (see ISO 14638). It influences the chain link A of the chains of

standards on areal surface texture.

The ISO GPS Masterplan given in ISO 14638 gives an overview of the ISO GPS system of which this

document is a part. The fundamental rules of ISO GPS given in ISO 8015 apply to this document.

The default decision rules given in ISO 14253-1 apply to specifications made in accordance with this

document, unless otherwise stated.

For more detailed information of the relation of this standard to the GPS matrix model, see Annex F.

This part of ISO 25178 covers the indication of areal surface texture
vi © ISO 2016 – All rights reserved
---------------------- Page: 12 ----------------------
SIST EN ISO 25178-1:2016
INTERNATIONAL STANDARD ISO 25178-1:2016(E)
Geometrical product specifications (GPS) — Surface
texture: Areal —
Part 1:
Indication of surface texture
1 Scope

This part of ISO 25178 specifies the rules for indication of areal surface texture in technical product

documentation (e.g. drawings, specifications, contracts, reports) by means of graphical symbols.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 1101:2012, Geometrical product specifications (GPS) — Geometrical tolerancing — Tolerances of form,

orientation, location and run-out

ISO 1302:2002, Geometrical Product Specifications (GPS) — Indication of surface texture in technical

product documentation

ISO 3098-2, Technical product documentation — Lettering — Part 2: Latin alphabet, numerals and marks

ISO 14406, Geometrical product specifications (GPS) — Extraction

ISO 16792, Technical product documentation — Digital product definition data practices

ISO 25178-2:2012, Geometrical product specifications (GPS) — Surface texture: Areal — Part 2: Terms,

definitions and surface texture parameters

ISO 25178-3:2012, Geometrical product specifications (GPS) — Surface texture: Areal — Part 3:

Specification operators

ISO 81714-1, Design of graphical symbols for use in the technical documentation of products — Part 1:

Basic rules
3 Terms and definitions

For the purpose of this document, the terms and definitions given in ISO 1101, ISO 1302, ISO 14406,

ISO 16792, ISO 25178-2 and ISO 25178-3 apply.
4 Graphical symbols for the indication of areal surface texture

Requirements for areal surface texture are indicated on technical product documentation by graphical

symbols, each having its own significant meaning. The symbols used are similar to the ones defined in

ISO 1302:2002, Clause 4. To identify that the requirement is an areal surface texture, a rhomb is added

to the symbol, see Table 1.
© ISO 2016 – All rights reserved 1
---------------------- Page: 13 ----------------------
SIST EN ISO 25178-1:2016
ISO 25178-1:2016(E)
Table 1 — Graphical symbols for the indication of areal surface texture
No. Description Symbol
1 Basic graphical symbol for areal surface texture
2 Expanded graphical symbol indicating removal of material required
3 Expanded graphical symbol indicating removal of material not permitted
4 Complete graphical symbol.
Any manufacturing process permitted
5 Complete graphical symbol
Material shall be removed
6 Complete graphical symbol
Material shall not be removed
7 Complete graphical symbol
With “all around” modifier

When the same surface texture is required on all surfaces around a workpiece outline (integral

features), represented on the drawing by a closed outline of the workpiece, a circle shall be added to the

complete graphical symbol as illustrated in Table 1 and shown in Figure 1.

Surfaces shall be indicated independently if any ambiguity may arise from the all-around indication.

Figure 1 — Areal surface requirement for all six surfaces represented by outline on workpiece

2 © ISO 2016 – All rights reserved
---------------------- Page: 14 ----------------------
SIST EN ISO 25178-1:2016
ISO 25178-1:2016(E)

The outline on the drawing in Figure 1 represents the six surfaces shown on the 3 D-representation of

the workpiece (the front and rear surfaces not included).

NOTE In 3-D annotation, it might be helpful to add an intersection plane indicator to make the annotation

drawing plane independent. For further instructions, see Annex D.
5 Composition of complete graphical symbol for areal surface texture
5.1 General

In order to ensure that an areal surface texture requirement is unambiguous, it is necessary, in addition

to the indication of both a surface texture parameter and its numerical value, to specify additional

requirements (e.g. type of scale limitation, transmission band, type of filters, manufacturing process,

surface lay and possible machining allowances). It may also be necessary to set up requirements for

several different surface texture parameters in order that the surface texture requirements ensure the

functional properties of the surface. (Examples of indications of areal surface texture requirements are

given in Annex C.)
5.2 Positions of surface texture requirements

The mandatory positions of the various surface texture requirements in the complete graphical symbol

are shown in Figure 2.

Figure 2 — Positions of surface texture requirements in the complete graphical symbol

The complementary surface texture requirements in the form of
— surface texture parameters
— numerical values, and
— a transmission band

shall be located at the specific positions in the complete graphical symbol in accordance with the

following.
a) Position a – Single surface texture requirement

Indicate the type of specification limit, the type of scale limited surface and its nesting indices, the

areal surface texture parameter designation with its limit value and other non-defaults in this order.

Generally, the different parts of the indication are separated by a single space but to avoid

misinterpretation, a double space (double blank) shall be inserted between the parameter

designation and the limit value. Oblique strokes (/) are used to separate the specification sections,

see Annex B.

For more information on the contents of position “a”, consult Annex B. Also see ISO 1302:2002,

Clause 6.

EXAMPLE S-L 0,025-0,8/Sz 6,8 (minimum content example with mandatory indication of type of scale-

limited surface and its nesting indices)
© ISO 2016 – All rights reserved 3
---------------------- Page: 15 ----------------------
SIST EN ISO 25178-1:2016
ISO 25178-1:2016(E)
b) Position a and b – Two or more surface texture requirements
Indicate the first surface texture requirement at position “a” as in a).
Indicate the second surface texture requirement at position “b”.

If a third requirement or more is to be indicated, the graphical symbol is to be enlarged accordingly

in the vertical direction, to make room for more lines. The positions “a” and “b” are to be moved

upwards when the symbol is enlarged. See also ISO 1302:2002, Clause 6.

The orientation of the evaluation area and the orientation of the lay are determined by the position

of the graphical symbol on the drawing.

NOTE 1 To make the annotation drawing plane independent, it might be helpful to add an intersection

plane indicator, for further instruction see Annex D

c) Position c – Intersection plane for indication of orientation of the evaluation area

If helpful, indicate intersection plane for orientation of the evaluation area, see Annex D.

NOTE 2 If the orientation of the lay is the same as the orientation of the evaluation area, this intersection

plane indicator covers both.
d) Position d– Manufacturing requirements

Indicate the manufacturing method, treatment, coatings or other requirements for the

manufacturing process to produce the surface, for example, turned, ground, plated. See also

ISO 1302:2002, Clause 7.
e) Position e– Surface lay

Indicate the required surface lay symbol in position e, for example, “=”, “X”, “M”. See Table 2. Like

the orientation of the evaluation area, the orientation of the lay is determined by the position of the

graphical symbol on the drawing.

NOTE 3 If another orientation of the lay is required, it can be indicated in position f by an intersection

plane indicator, see Annex D.

f) Position f - Intersection plane indicator for indication of orientation of the surface lay

If the orientation of the surface lay differs from the orientation of the surface texture symbol, it can

be indicated here by an intersection plane indicator. See Annex D.
g) Position g – Machining allowance

Indicate the required machining allowance, if any, as a numerical value given in millimetres. See

also ISO 1302:2002, Clause 9.
6 Indication of areal surface parameters
6.1 Definition of the tolerance
In the normal case, two conditions are given:
— the type of tolerance, upper or lower limit, designations U or L;

— the type of scale-limited surface, S-F or S-L, as defined in ISO 25178-2:2012, 3.1.5 and 3.1.6.

In the normal case, the upper limit is specified. The designation “U” is then an implicit default and can be

left out. For some parameters where there is no normal case, i.e. material ratio parameters and feature

parameters, it is recommended always to use the designations U or L. See also ISO 1302:2002, 6.6.

4 © ISO 2016 – All rights reserved
---------------------- Page: 16 ----------------------
SIST EN ISO 25178-1:2016
ISO 25178-1:2016(E)

If not otherwise specified, the parameter value indicated is the largest or smallest value allowed.

For bilateral tolerances, see 5.2 b).
6.2 Definition of the parameter

The chosen surface texture areal parameter value shall be supplemented with the information

necessary for a correct and unambiguous specification.
In the normal case, three types of information are given:
— filters and nesting indexes;
— parameter and parameter value;
— non-defaults.
For examples, see Annex B.
Defaults according to ISO 25178-2 and -3 are normally not explicitly specified.

Every areal surface texture parameter has its own default control elements and information

requirements for specification of non-default elements as given in ISO 25178-3.

The order of the information items follows in principle the order found in ISO 1302 for profile

parameters.
For filter designations, see Annex E.
6.3 Indication of manufacturing method or related information

The surface texture parameter value of an actual surface is strongly influenced by the detailed form

of the surface texture. A parameter designation, parameter value and transmission band — indicated

solely as a surface texture requirement — do not therefore necessarily result in an unambiguous

function of the surface.

It is consequently sometimes necessary to complement the specification with a statement of the

manufacturing process.
For examples, see ISO 1302:2002, Clause 7.
6.4 Indication of surface lay
Standard lay symbols and their indication are shown in Table 2.
© ISO 2016 – All rights reserved 5
---------------------- Page: 17 ----------------------
SIST EN ISO 25178-1:2016
ISO 25178-1:2016(E)
Table 2 — Indication of surface lay
Graphical symbol Interpretation Examples
Parallel to plane of projection of view in
which symbol is used
Perpendicular to plane of projection of
view in which symbol is used
Crossed in two oblique directions relative
to plane of projection of view in which
symbol is used
Multi-directional
Approximately circular relative to centre
of surface to which symbol applies
Approximately radial relative to centre
of surface to which symbol applies
Lay is particulate, non-directional or
protuberant
1 Direction of lay
6 © ISO 2016 – All rights reserved
---------------------- Page: 18 ----------------------
SIST EN ISO 25178-1:2016
ISO 25178-1:2016(E)

If it is necessary to specify a surface pattern which is not clearly defined by the symbols in Table 2, this

shall be achieved by the addition of a suitable note to the drawing.
6.5 Indication of machining allowance
See ISO 1302:2002, Clause 9.
6.6 Position on drawings and other technical product documentation
See ISO 1302:2002, Clause 11.
6.7 Proportions and dimensions of graphical symbols
See Annex A.
6.8 Orientation of the evaluation area

The position and orientation of the symbol, as exemplified in ISO 1302:2002, Clause 11, determine the

orientation of the evaluation area. See also ISO 25178-3:2012, 4.2.1.1.

NOTE 1 This is a difference from the procedure for profile evaluation where it is stipulated that the

measurement direction is chosen as the one expected to give the largest value for the assessed parameter,

normally found perpendicular to any dominant surface lay. See also ISO 4288.

NOTE 2 In 3-D annotation, it might be helpful to add an intersection plane indicator to make the annotation

drawing plane independent, for further instruction see Annex D.
7 Coordinate system

The usual coordinate system in which areal surface texture parameters are defined is a rectangular

coordinate system in which the axes form a right-handed Cartesian set, the x-axis being the direction

of tracing as indicated by the position of the graphical symbol on the drawing and nominally lying on

the real surface, the y-axis also nominally lying on the real surface and the z-axis being in the outward

direction (from the material to the surrounding medium). See Figure 3.

By convention when areal surface texture requirements are the same in both the x- and y-directions,

the x-axis requirements are shown; see Annex B for further details.

This local coordinate system is not to be confused with the coordinate system used for the complete

drawing, which may be different.

Defining the exact orientation of the evaluation area (on which the surface texture parameter is

defined) is only necessary when the requirements are different in the x- and y-directions.

NOTE Normally, the information on the drawing is enough for the orientation of the evaluation area and the

lay orientation. If not one or two intersection plane indicators can be used, see Annex D.

© ISO 2016 – All rights reserved 7
---------------------- Page: 19 ----------------------
SIST EN ISO 25178-1:2016
ISO 25178-1:2016(E)
a) 2-D drawing b) 3-D drawing

Figure 3 — Example of local coordinate system directions in a 2-D and a 3-D drawing

8 Digital product definition data

All advice given in ISO 16792 is also, when applicable, valid for specifications made according to this

International Standard.
When specifications are made on 3-D
...

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.