(1SO) 3443/2 International Standard INTERNATIONAL ORGANIZATION FOR STANDARDIZATION MEXAYHAPOAHAH OPTAHW3ALMR HO CTAHAAPTW3AUWV-ORGANISATION INTERNATIONALE DE NO RMALISATION Tolerances for building - Part 2 : Statistical basis for predicting fit between components having a normal distribution of sizes Tolerancespourle batiment- Partie 2 : Base statistique pour la preévision de possibilités d'assemblage entre composants, relevantd'unedistributionnormaledes dimensions First edition - 1979-07-15 3443/2-1979 (E) UDC 69 : 721.01 Ref. No. 1SO 3443/2-1979 (E) Descriptors : buildings, construction, joints, compatibility, fits, dimensional tolerances, statistical analysis. Copyright International Organization for Standardization Price based on 5 pages 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 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 the member bodies for approval before their acceptance as International to Standards by the ISO Council. International Standard jSO 3443/2 was developed by Technical Committee ISO/TC 59, Building construction, and was circulated to the member bodies in October 1977. It has been approved by the member bodies of the following countries : Hungary Australia Portugal Austria Israel Romania Belgium Italy South Africa, Rep. of Canada Japan Spain Czechoslovakia Korea, Rep. of Sweden Denmark Mexico United Kingdom Egypt, Arab Rep. of USSR New Zealand Finland Norway Poland Germany, F.R. The bodies of the following countries expressed disapproval of the member document on technical grounds : France Netherlands @ International Organization for Standardization, 1979 : Printed in Switzerland d without license from IHS Not for Resale This International Standard forms one of a series concerning tolerances for components and construction of predictable variability. This series includes the following : ISO 1803, Tolerances for building - Vocabulary.1) IsO 3443/1, Tolerances for building - Part 1 : Basic principles for evaluation and specification.2) ISO 4464, Tolerances for building -- ldentification of tolerances and their relationship.3) It is envisaged that a group of standards in the series will deal with calcu- lation. methods for relating tolerances, work sizes and joint width.4) This Inter- national Standard describes the statistical basis of such calculation methods, and subsequent standards within the group will describe modifications and additions to this statistical basis to take account of various factors that arise in practice. The annex is for information and does not form an integral part of this International Standard. 1) Under revision. At present at the stage of draft. 2) 3) In preparation. The expression joint width" is used in this International Standard as it is the term 4) currently used. In this case, it should be made clear that it indicates the notion which is expressed in Iso 2444 by the less commonly used term "joint clearance" as follows : joint clearance : The distance between the joint faces of two components set side by side, i.e. the distance considered in order to achieve fit. iii Not for Resale d without license from IHS