(ISO International Standard 657/19 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION+MEKAYHAPOAHAR OPFAHM3AMR IO CTAHAAPTW3ALMM+ORGANISATION INTERNATIONALE DE NORMALISATION Hot-rolled steel sections Part 19 : Bulb flats (metric series) - Dimensions, sectional properties and tolerances Profiles en acier lamines a chaud-Partie 19:Plats aboudin (serie metrique)-Dimensions,caracteristiques rapportees aux axesettolérances First edition - 1980-02-01 ISO 657/19-1980 (E) UDC669.14-422.2 Ref.No. 1SO 657/19-1980 (E) Descriptors : metal sections, steel products, hot rolled products, sectional properties, dimensions, dimensional tolerances. Price based on 3 pages 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 657/19 (formerly ISO/DIS 4974)was developed by Technical Committee ISo/Tc 17, Steel,and was circulated to the member bodies in January1978. It has been approved by the member bodies of the followingcountries : india Poland Australia Belgium Iran Romania Bulgaria Ireland South Africa, Rep. of Canada Italy Spain Czechoslovakia Korea, Dem. P. Rep. of Sweden Denmark Korea, Rep.of Switzerland Egypt, Arab Rep. of Mexico Turkey Finland Netherlands United Kingdom France New Zealand USSR Germany,F.R. Norway The member bodies of the following countries expressed disapproval of the document on technical grounds : Japan USA internationalOrganizationforStandardization1980 Printed in Switzerland INTERNATIONALSTANDARD ISO657/19-1980 (E) Hot-rolled steel sections Part 19 : Bulb flats (metric series) - Dimensions, sectional properties and tolerances 1 SCOPEANDFIELDOFAPPLICATION This International Standard specifies dimensions, sectional properties and dimensional tolerances for metric series hot-rolled steel bulb flats. 2DESIGNATION Hot-rolled steel bulb flats shall be designated by the width,b, and thickness, t. Example:200x10 3DIMENSIONS Thedimensionsof bulbflats shall beasgiven intable1.