(ISO 6411 International Standard INTERNATIONALORGANIZATION FOR STANDARDIZATION MEKIYHAPOIHAA OPrAHW3AUMA IO CTAHAAPTW3ALWMORGANISATION INTERNATIONALE DENORMALISATION Technical drawings - Simplified representation of centre holes Dessins techniques -- Representation simplifiee des trous de'centre First edition - 1982-04-15 UDC 744.4 S0 6411-1982 (E) Ref. No. ISO 6411-1982 (E) Descriptors : engineering drawings, centre holes, graphic methods, generalities, designation. Price based on 5 pages without license from IHS Not for Resale Foreword Iso (the International Organization for Standardization) is a worldwide federation of national standards institutes (ISO member bodies). The work of developing Inter- national 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 6411 was developed by Technical Committee ISO/TC 10, Technical drawings, and was circulated to the member bodies in January 1980. It has been approved by the member bodies of the foliowing countries : :Australia France Poland Germany, F. R. Romania Austria India :Belgium South Africa, Rep. of Brazil Italy Spain Canada Japan Sweden China Korea, Dem. P. Rep. of Switzerland Czechoslovakia Korea, Rep. of United Kingdom Denmark Mexico USA Norway Finland USSR The member body of the following country expressed disapproval of the document on technical grounds : Netherlands @ International Organization for Standardization, 1982 Printed in Switzerland ed without license from IHS Not for Resale ISO 6411-1982 (E) INTERNATIONAL STANDARD Technical drawings - Simplified representation of centre holes Scope and field of application ISo 3098/1, Technical drawings - Lettering - Part 1 : 1 Currently used characters. This International Standard specifies the simplified represen- tation of centre holes and their designation. Simplified ISO 6428, Technical drawings -- Requirements for micro- representation of centre holes may be used particularly when it copying. 1) is not necessary to show the exact form and size and where the designation of standardized centre holes is sufficient for infor- mation. 3 Indication on drawings 2 References 3.1 Requirements ISO 128, Technical drawings - General principles of presen- Generally, three different requirements may be defined on tation. technical drawings for the form and size of centre holes, Iso 866, Centre drills for centre holes without protecting namely : chamfers -- Type A. a) centre hole is required on the finished part; Iso 2540, Centre drills for centre holes with protecting chamfers - Type B. b) centre hole can be accepted on the finished part, but is not a fundamental requirement; ISo 2541, Centre drills for centre holes with radius form -- c) centre hole shall not exist on the finished part. Type R. 1) At present at the stage of draft. CopyrightInternational Organization for Standardization d without license from IHS Not for Resale