ISO INTERNATIONAL STANDARD 7226 Second edition 1988-05-15 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEKAYHAPOAHAROPIAHM3ALMRNOCTAHAAPTM3ALMM Hexagonal dienuts Filieres hexagonales de filetage a main Reference number ISO 7226 : 1988 (E) Copyright Intemational Organization for Standardization nited without license from IHS Not for Resale ISO 7226-1988 (E) Foreword national standards bodies (iSO member bodies). The work of preparing International Standards isnormallycarried outthroughIsOtechnical committees.Eachmember the right to be represented on that committee. Internationai organizations, govern- mental and non-governmental, in liaison with ISO, also take part in the work. ISo collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. 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. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 7226 was prepared by Technical Committee ISO/TC 29, Small tools. This second edition cancels and replaces the first edition (IS0 7226 : 1985), of which it constitutes a minor revision. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latestedition,unlessotherwisestated. InternationalOrganizationforStandardization,1988 Printed in Switzerland Copyright International Organization for Standardization No reproductio permited without license from IHS Not for Resale ISO7226:1988(E) INTERNATIONALSTANDARD Hexagonal dienuts Introduction ISO263,/SOinchscrewthreads-Generalplanandselection forscrews,boltsandnuts-Diameterrange0,06to6in. Circular screwing dies are specified for certain thread forms in ISO2568,ISO4230andISO4231.Forcertainsizesofthese ISo2568,Hand-andmachine-operatedcircularscrewingdies threads, it is convenient for some purposes to use hexagonal and hand-operated die stocks. dienuts instead of circular dies and, for purposes connected with their manufacture and use, it is desirable that certain ISo4230,Hand-andmachine-operated circular screwingdies dimensions of these dienuts should be standardized. fortaperpipethreads-Rseries. IS0 4231,Hand-and machine-operated circular screwing dies for parallel pipe threads -G series. 1 Scope and field of application 3 Dimensions and tolerances This International Standard specifies the general dimensions of hexagonal dienuts for certain sizes of iso metric threads (coarse and fine pitch series - see iSO 68 and ISO 261), ISO See the figure, and tables 1 and 2. inch threads (UNC and UNF series - see ISO 68 and ISO263), and pipe threads (G andRseries IsO 7-1 and see 4 Marking IS 228-1), as well as the non-preferred thread series BSW, BSFand BA. Dienuts having dimensions in accordance with those given in table 1 shall be marked with the relevant thread designation specified in IS0 2568. References Dienuts having dimensions in accordance with those given in table 2 shall be marked with the letter R immediately followed Iso 7-1, Pipe threads where pressure-tight joints are made on by the designation of the thread. thethreads Part 1:Designation, dimensionsand tolerances. Example: Iso68,/sogeneralpurposescrewthreads-Basicprofile A hexagonal dienut for R series pipe threads with designation 1/8 shall be marked as follows: ISo 228-1, Pipe threads where pressure-tight joints are not made on the threads -Part 1: Designation, dimensions and R 1/8 tolerances. Where tools comply in all respects with the relevant Inter- IsO261,/SOgeneralpurposemetricscrewthreads-General national Standards, the symbol iso may be appended to the plan. mark at the discretion of the manufacturer. 1 Copyright International Organization fo