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INTERNATIONALTANDARDINTERNATIONAL ORGANIZATION FOR STANDARDIZATION.ME~YHAPOCJHAR OPI-AHM3AL lR l-i0 CTAH~APTL13A~Wl.ORGANISATlON INTERNATIONALE DE NORMALISATION

Technical drawings - ScalesDessins techniques - lkhelles

First edition - 1979-02-15

UDC 744.4Descriptors : scale (ratio), designation, engineering drawings.

Ref. No. ISO 5455-1979 (E)

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All other uses prohibited.

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FOREWORDISO (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 and non-governmental, in liaison with ISO, also take part in the work.Draft International Standards adopted by the technical committee s are circulatedto the member bodies for approval before their acceptance as InternationalStandards by the ISO Council.

International Standard ISO 5455 was developed by Technical CommitteelSO/TC IO, Technical drawings, and was circulated to the member bodies inMay 1977.

lt has been approved by the member bodies of the foilowing countries LAustraliaAustriaBelgiumBrazilBulgariaCanadaChileDenmarkFinlandFrance

The member bod ies of thedocument on technical grounds

Germany, R. F.HungaryIndiaI relandItalyJapanMexicoNetherlandsNew ZealandNorway

PhilippinesRomaniaSouth Africa, Rep. ofSpainSwtizerlandTurkeyUnited KingdomU.S.A.U.S.S. R.Yugoslavia

following countries expressed disapproval of the

CzechoslovakiaPolandSweden

@J International Organkation for Standardkation, 1979 lPrinted in Switzeriand

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INTERNATIIONAL STANDARD ISO 5455-1979 (E)

Technical drawings - Scales

1 SCOPE AND FIELD OF APPLICATIONThis International Standard specifies recommended scalesand their designation for use on all technical drawings inany field of engineering.

2 DEFINITIONS2.1 scale : Ratio of the linear dimension of an elementof an Object as represented in the original drawing to thereal linear dimension of the Same element of the Objectitself.NOTE - The scale sf a print may be different from that of theoriginal drawing.

2.2 full size : A scale with the ratio 1 : 1.2.3 enlargernent scale : A scale where the ratio is largerthan 1 : 1. lt is said to be larger as its ratio increasesS.

2.4 reduction scale : A scale where the ratio is smallerthan 1 : 1. lt is said to be smaller as its ratio decreases.

3 DESIGNATIONThe complete designation of a scale shall consist of theword SCALE (or its equivalent in the language used onthe drawing) followed by the indication of its ratio, asfoIlows :

- SCALE 1 : 1 for full size;- SCALE X : 1 for enlargement scales;- SCALE 1 : X for reduction scales.

If there is no likelihood of misunderstanding, the wordSCALE may be omitted.

4 INSCRIPTION4.1 The designation of the scale used on the drawingshall be inscribed in the title block of the drawing.4.2 Where it is necessary to use more than one scale ona drawing, the main scale only shall be inscribed in the titleblock, and all other scales adjacent to the item referencenumber of the part concerned, or adjacent to the referenceletter of a detail view (or section).

5 SCALES5.1 The recommende d scales for use on technical drawingsare specified in the following table.

Category Recommended scalesEnlargementscal es

5O:l 20 : 1 IO:15:l 2:l

Full size

Reductionscal es

1 :l1:2 1:5 1 :lO1:20 1:50 1 :lOO1 :200 1 :500 1 : 1 0001 :2000 1 :5000 1 : 10000

NOTE - If, for special app lications, there is need for a larger en-largement scale or a smaller reduction scale than those shown in thetable, the recommended range of scales may be extended in eitherdirection, provided that the required scale be derived from a recom-mended scale by multiplying by whole number powers of 10. Inexceptional cases where for functional reasons the recommendedscales cannot be applied, intermediate scales may be Chosen.

5.2 The scale to be Chosen for a drawing will dependupon the complex ity of the Object to be depicted and thepurpose of the representation.In all cases, the selected scale shall be large enough topermit easy and clear interpretation of the informationdepicted.The scale and the size of the Object, in turn, will decidethe size of the drawing.

5.3 Details that are too small for complete dimensioningin the main representation shall be shown adjacent to themain representation in a separate detail view (or section)which is drawn to a larger sca le.

6 LARGE SCALE DRAWINGSlt is recommende d that, for information, a full size viewbe added to the large scale representation of a small Object.In this case the full size view may be simplified by showingthe outlines of the Object only.

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