ICS 01.100.20; 25.020Descriptors: Undercuts, types, dimensions, technical drawings.Freistiche – Formen, MaßeRef. No. DIN 509 : 1998-06English price group 07Sales No. 010704.99DEUTSCHE NORMJune 1998509{Continued on pages 2 to 6.© No part of this translation may be reproduced without the prior permission ofDIN Deutsches Institut für Normung e.V., Berlin.Beuth Verlag GmbH, D-10772 Berlin, has the exclusive right of sale for German Standards (DIN-Normen).Forms and dimensions of undercutsIn keeping with current practice in standards published by the International Organization for Standardization(ISO), a comma has been used throughout as the decimal marker.Translation by DIN-Sprachendienst.In case of doubt, the German-language original should be consulted as the authoritative text.SupersedesAugust 1966 edition.Forew ordThis standard has been prepared by the Normenausschuß Technische Grundl agen (Fundamentals inTechnology Standards Committee).AmendmentsThe standard has been completely revised.Previous editionDIN 509: 1956-04, 1966-01, 1966-08.Dimensions in mm1Scope and field of applicationThis standard specifies undercuts on turned parts and in bores, and gives details of the indication ofundercuts on drawings.2Normative referencesThis standard incorporates, by dated or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text and titles of the publications are listedbelow. For dated references, subsequent amendments to or revisions of any of these publications apply tothis standard only when incorporated in it by amendment or revision. For undated references, the latestedition of the publication referred to applies.DIN 250Rounding radiiDIN 4768Determination of surface rough...
