NTERNATIONAL STANDARDTSO 5455 INTERNATIONALORGANIZATION FOR STANDARDIZATIONMEKAYHAPOAHAR OPTAHM3ALMAHO CTAHAAPTW3ALMW+ORGANISATION INTERNATIONALEDENORMALISATION Technical drawings -- Scales Dessins techniques-Echelles Firstedition-1979-02-15 5455-1979 (E) UDC 744.4 Ref.No. ISO5455-1979 (E) Descriptors : scale(ratio),designation, engineeringdrawings. CoovihtIntemainalOraanizationfor Stadadization FOREWORD Iso (the International Organization for Standardization) is a worldwide federation of national standards institutes (iso member bodies).The work of developing International Standards is carried out through Iso technical committees. Every member body interested in a subject for which a technical committee has been set up 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 committees are circulated to the member bodies for approval before their acceptance as International Standards by the ISO Council. International Standard ISO 5455 was developed by Technical Committee ISO/TC 10, Technical drawings, and was circulated to the member bodies in May 1977. It has been approved by the member bodies of the foilowing countries : Australia Germany, R. F. Philippines Austria Hungary Romania Belgium India South Africa, Rep. of Brazil Ireland Spain Bulgaria Italy Swtizerland Canada Japan Turkey Chile Mexico United Kingdom Denmark Netherlands U.S.A. Finland New Zealand U.S.S.R. France Norway Yugoslavia The member bodies of the following countries expressed disapproval of the document on technical grounds : Czechoslovakia Poland Sweden @International Organization for Standardization,1979 Printed in Switzerland Coovriaht International Oraanization for Standardization ISO5455-1979 (E) INTERNATIONALSTANDARD Technical drawings - Scales 1SCOPEANDFIELDOFAPPLICATION 5SCALES This International Standard specifies recommended scales 5.1 The recommended scales for use on technical drawings and their designation for use on all technical drawings in are specified in the following table. any field of engineering. Category Recommended scales 2 DEFINITIONS Enlargement 50 : 1 20 : 1 10:1 2.1 scale:Ratio of the linear dimension of an element scaies 5:1 2 :1 of an object as represented in the original drawing to the real linear dimension of the same element of the object Full size 1 :1 itself. 1:2 1 : 5 1 :10 NOTE - The scale of a print may be different from that of the Reduction 1 : 20 1 : 50 1 : 100 original drawing. scales 1 : 200 1 : 500 1:1000 1 :2000 1 : 5 000 1:10000 2.2 full size :A scale with theratio1:1. NOTE - If, for special applications, there is need for a larger en- largement scale or a smaller reduction scale than those shown in the 2.3 enlargement scale: A scale where the ratio is larger table, the recommended range of scales may be extended in either than 1 : 1. it is said to be larger as its ratio increases. direction, provided that the required scaie be cierivedi from a recom- mended scale by multipiying by whole number powers of 10. In 2.4 reduction scale: A scale where the ratio is smaller exceptional cases where for functional reasons the recommended scales cannot be applied, intermediate scales may be chosen. than1:1.It is said tobe smalleras its ratio decreases. 3DESIGNATION 5.2 The scale to be chosen for a drawing will depend upon the compiexity of the object to be diepictedi and the The complete designation of a scale shall consist of the purpose of the representation. word "SCALE" (or its equivalent in the language used on the drawing) followed by the indication of its ratio, as In all cases, the selected scale shall be large enough to permit easy and clear interpretation of the information depicted. SCALE 1 : 1 for full size; The scale and the size of the object, in turn, wili decide SCALE X : 1 for enlargement scales; the size of the drawing. SCALE 1 : X for reduction