1、ICS 17.040.30RadienIn keeping with current practice in standards published by the International Organization for Standardization(ISO), a comma has been used throughout as the decimal marker.Ref. No. DIN 250 : 2002-04English price group 05 Sales No. 010503.03DEUTSCHE NORM April 2002250Continued on pa
2、ges 2 and 3. No part of this translation may be reproduced without the prior permission ofDIN Deutsches Institut fr Normung e.V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).Radii on workpieces and their representationin technica
3、l drawingsTranslation by DIN-Sprachendienst.In case of doubt, the German-language original should be consulted as the authoritative text.SupersedesJuly 1972 edition.ForewordThis standard has been prepared by Technical Committee Technisches Zeichnen of the NormenausschussTechnische Grundlagen (Fundam
4、entals in Technology Standards Committee).The objective of this standard is to limit the number of tools, gauges and measuring instruments needed forthe manufacture and checking of radii. Therefore, only the radii specified in this standard should be usedin the design of workpieces.AmendmentsThis st
5、andard differs from the July 1972 edition in that it has been editorially revised and the examples havebeen brought into line with current practice.Previous editionsDIN 250: 1922-01, 1924-04, 1939-12, 1972-07.All dimensions are in millimetres.1 ScopeThis standard specifies radii on workpieces and gi
6、ves examples of their representation in technical draw-ings. The radii conform to the preferred number series R 5, R 10, and R 20 as in DIN 323-1, with some of thevalues taken from the corresponding rounded value series R” 5, R 10, and R” 10.2 Normative referencesThis standard incorporates, by dated
7、 or undated reference, provisions from other publications. Thesenormative references are cited at the appropriate places in the text, and the titles of the publications arelisted below. For dated references, subsequent amendments to or revisions of any of these publicationsapply to this standard onl
8、y when incorporated in it by amendment or revision. For undated references, thelatest edition of the publication referred to applies.DIN 323-1 Preferred numbers and preferred number series Basic, calculated and rounded valuesDIN 406-11 Engineering drawing practice Dimensioning Principles of applicat
9、ionPage 2DIN 250 : 2002-043 SizesSizes of radii on workpieces shall be as given in table 1. Series 1 sizes are to be given preference.Table 1: Sizes of radiiPage 3DIN 250 : 2002-04Annex AExamplesNOTE: Symbol r indicates a radius as a design feature and should not be confused with symbol R (cf.DIN 406-11) which is used for dimensioning radii on drawings (e.g. R 50).Figure A.1: Radii on ends and undercutsFigure A.2: Radii on holes and counterboresFigure A.3: Radii on an opening (eye)Figure A.4: Radii on flat platesFigure A.5: Radii on castings, forgings, and moulded parts
