ISO 1302-1978 - Technical drawings - Method of indicating surface texture on drawings

Oct 29, 2026

ISO 1302:1978 specifies the symbols and additional indications used to show surface texture on technical drawings. It defines how basic symbols are formed and interpreted, including cases where machining material removal is required or prohibited. The standard also describes how surface roughness values and special surface texture characteristics are added to the symbols, and how indications are placed on drawings to ensure consistent communication between engineering parties.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages11

Reading Time28 min

AccessFree to download

1 Scope and field of application

2 References

3 Symbols used for indication of surface texture

3.1 Basic symbol

3.2 Machining removal permitted/required

3.3 Machining removal not permitted

3.4 Use related to production process state

3.5 Indication of special surface characteristics

4 Indications added to the symbols

4.1 Indication of surface roughness

ISO 1302-1978(E) CA INTERNATIONAL ORGANIZATION FOR STANDARDIZATION·MEKIYHAPOIHAA OPTAHM3AIIM8 nO CTAHIAPTM3ALIMM·ORGANISATION INTERNATIONALE DE NORMALISATION Technical drawings -Method of indicating surface textureon drawings Dessins techniques-Indication des états de surface sur les dessins Second edition -1978-09-01h STANDARD PREVIEW(standards.iteh.ai) ISO 1302:1978 https:/standards.itehailcatalog/standards/sist/8884db63-e59b-4353-82c9-878bec69c210/iso-1302-1978 FOREWORD ISO(the International Organization for Standardization)is a worldwide federationof national standards institutes(ISO member bodies).The work of developingInternational Standards is carried out through ISO technical committees.Everymember body interested in a subject.for which a technical committee has been setup has the right to be represented on that committee.International organizations,governmental ard non-governmental,in liaison with ISO,also take part in the work. Draft International Standards adopted by the technical committees are circulatedto the member bodies for approval before their acceptance as InternationalStandards by the ISO Council. International Standard ISO 1302 was developed by Technical Committee ISO/TC10,Technical drawings.The first edition(ISO 1302-1974)had been approved by themember bodies of the following countries: HungaryPortugalAustraliaAustriaIndiaRomaniaBelgiumIranSouth Africa,Rep.ofBrazilIsraelSpainItalySwedenCanadaCzechoslovakiaSwitzerlandJapanDenmarkKorea,Rep.ofThailandEgypt,Arab Rep.ofNetherlandsNUnited KingdomREVIEWNew ZealandFinlandU.S.S.R.GermanyNorway (standards.iteh.ai)GreecePoland The member bodies of the following countries expressed disapproval of theRecommendation on technical grounds: standards.itehailcatalog/standards/sist/8884db63-e59b-4353-82c9-878bec69c210/iso-1302-1978FranceU.S.A. This second edition,which supersedes ISO 1302-1974,incorporates draftAddendum 1,which features at present as annex B,and which was circulated to themember bodies in October 1976.This draft addendum has been approved by themember bodies of the following countries: Australia Spain Korea,Rep.of Mexico Sweden Belgium Chile Netherlands Switzerland Denmark New Zealand Turkey Finland Poland United Kingdom India U.S.A. Romania ltaly South Africa,Rep.of U.S.S.R. The member bodies of the following countries expressed disapproval of thedocument on technical grounds: Canada France Germany Japan 5 International Organization for Standardization,1978· Printed in Switzerland CONTENTS Page 1 Scope and field of application…………………………………………………………………………………………1 2 References. . . . . . .. . . . . . .. . .. . . . . 1 3 Symbols used for indication of surface texture …………………………………………………………1 4 Indications added to the symbols……………………………………………………………………………2 4.1 Indication of surface roughness……………………………………………………………………………2 4.2 Indication of special surface texture characteristics . …………………………………3 4.3 Symbols for the direction of lay…………………………………………………………5 iTeh S 4.4 tndication of machining allowance…………………………………………………6 4.52Position bfthe specifications of surface texture in the symbol ……………6 5 Indications on drawings . …………………………………………………………………………………………6 https:/standards.it6almportant notessist84db63-e59b-4353-82c9………………………………………9 Anneesc69c210/iso-1302-1978 A Synoptic table. . . . .. . . . …………………………………………………………10 B Proportions and dimensions of symbols . …………………………………………………………12 iTeh STANDARD PREVIEW(standards.iteh.ai) ISO 1302:1978 https:/standards.itehailcataloglstandards/sist/8884db63-e59b-4353-82c9-878bec69c210/iso-1302-1978 # Technical drawings -Method of indicating surface textureon drawings ## 1 SCOPE AND FIELD OF APPLICATION This International Standard specifies the symbols and additional indications of surface texture to be indicated on technicaldrawings. NOTE -For uniformity all figures in this International Standar

FAQs

What does ISO 1302:1978 establish for technical drawings?

It specifies symbols and additional indications for communicating surface texture on technical drawings, including how they are constructed and interpreted.

How is the basic symbol for surface texture defined?

The basic symbol consists of two legs of unequal length inclined at approximately 60° to the line representing the considered surface, as shown in the standard’s figure.

When are machining-related additions made to the surface texture symbols?

A bar is added when removal of material by machining is required, while a circle is added when removal is not permitted. Special characteristics can also be indicated by adding a line to the longer arm.

Oct 29, 2026

Upload by EvelynWrites