ISO INTERNATIONAL STANDARD 3161 Third edition 1999-12-01 Aerospace UNJ threads General requirements and limit dimensions Aeronautique et espace - Filetage UNJ - Exigences générales et dimensions limites Reference number ISO 3161:1999(E) @ ISO 1999 ISO3161:1999(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this area. AdobeisatrademarkofAdobeSystems Incorporated Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. @ISO1999 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56. CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 734 10 79 E-mail [email protected] Web www.iso.ch Printed in Switzerland ii @ ISO 1999 - All rights reserved E"eqr[tkijvgf"d["WPG.'E1"1gpqxc.8I4:226"Ocftkf.'Urckp*cm'tkijvu'tgugtxgf+*"Uwp"Hgd’3:"22.37<75"WVE"4246 tnrtnfuoknni'ravint:Infl ISO 3161:1999(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (isO member bodies). The work of preparing International Standards is normally carried out through IsO technical liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. International Standard ISO 3161 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles, Subcommittee SC 4, Aerospace fastener systems. This third edition cancels and replaces the second edition (IsO 3161:1996), which has been technically revised. ii