SIST EN ISO 25178-1:2016

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: 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)

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
• Public Enquiry End Date: 29-Sep-2015
• Publication Date: 07-Jun-2016
• ICS: 17.040.20 - Properties of surfaces
• ICS: 17.040.40 - Geometrical Product Specification (GPS)
• Technical Committee: ISEL - Mechanical elements
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 25-May-2016
• Due Date: 30-Jul-2016
• Completion Date: 08-Jun-2016
• Ref Project: EN ISO 25178-1:2016 - Geometrical product specifications (GPS) - Surface texture: Areal - Part 1: Indication of surface texture (ISO 25178-1:2016)

Overview

EN ISO 25178-1:2016 - "Geometrical product specifications (GPS) - Surface texture: Areal - Part 1: Indication of surface texture" defines how to indicate areal (3D) surface texture requirements in technical product documentation. Published by CEN as the European adoption of ISO 25178-1:2016, this standard specifies the graphical symbols, composition rules and annotation practices used on drawings, specifications, contracts and reports to make areal surface texture requirements unambiguous.

Keywords: EN ISO 25178-1:2016, surface texture, areal, GPS, graphical symbols, technical product documentation.

Key topics

• Scope and purpose: Rules for indicating areal surface texture requirements by graphical symbols in technical documentation.
• Graphical symbols: Uses symbols similar to ISO 1302 with a distinguishing rhomb to identify areal surface texture; expanded symbols indicate whether material removal is permitted or not. An “all-around” modifier (circle) can mark integral features.
• Composition of complete symbols: Specifies positions for information items (e.g., parameter, tolerances, modifiers) so annotations are clear and consistent.
• Indication of parameters and tolerances: Rules for defining which areal surface texture parameters apply and how tolerances are shown to ensure measurable, enforceable requirements.
• Orientation and evaluation area: Guidance on evaluation-area orientation, intersection-plane indicators and coordinate-system declaration to avoid ambiguity.
• Digital product definition: Addresses use in digital CAD/PDM environments (see ISO 16792 compatibility).
• Normative annexes: Includes proportions/dimensions of symbols, examples for unambiguous specification, recommended procedures for intersection planes and relation to the GPS matrix model.

Relevant normative references include ISO 1101, ISO 1302, ISO 25178-2 and ISO 25178-3, ISO 14406 and ISO 16792.

Applications

• Engineering drawings and specifications where 3D surface texture matters (functional surfaces, sealing faces, optical components).
• Manufacturing and process planning to communicate whether material removal is permitted or required.
• Quality control, inspection planning and metrology reporting to specify which areal parameters and tolerances to measure.
• CAD/PDM and digital product-definition workflows that embed surface texture requirements in 3D models and technical data.
• Suppliers, OEMs and contract documents requiring consistent, unambiguous surface texture communication.

Who uses this standard

• Design and mechanical engineers
• Metrology and quality engineers
• Technical drafters and CAD specialists
• Manufacturing engineers and process planners
• Inspection labs and suppliers working to GPS (geometrical product specification) practices

Related standards

• ISO 25178-2 (terms & parameters) and ISO 25178-3 (specification operators)
• ISO 1302 (surface texture indication - legacy 2D symbols)
• ISO 1101 (geometrical tolerancing)
• ISO 16792 (digital product definition)

Using EN ISO 25178-1:2016 ensures consistent, machine-readable and legally defensible communication of areal surface texture requirements across design, manufacturing and inspection.

Standards Content (Sample)

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

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.

Contents Page
European foreword . 3
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.
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
ISO 25178-1:2016(E)
© 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.
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www.iso.org
ii © ISO 2016 – All rights reserved

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 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

ISO 25178-1:2016(E)
— Part 5: Verification operators
1)
— 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 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

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 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

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 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

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 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

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
...