ISO INTERNATIONAL STANDARD 17420-3 First edition 2012-10-15 Respiratory protective devices Performance requirements - Part 3: Thread connection Appareils de protection respiratoire - Exigences de performances Partie 3: Raccord normalisé Reference number IS017420-3:2012(E) LSO @ISO2012 HS under ted without license from IHS Not for Resale IS0 17420-3:2012(E) COPYRIGHTPROTECTEDDOCUMENT ISO2012 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 addressbeloworIso'smemberbodyinthecountryoftherequester. ISO copyright office Case postale 56:CH-1211 Geneva 20 Tel.+41227490111 Fax +41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland @ IS0 2012 - All rights reserved No reproductic networking permited without license from IHS Not for Resale IS0 17420-3:2012(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references ..1 3 Terms, definitions and symbols. 3.1 Terms and definitions .1 3.2 Symbols 1 4 Requirements .2 4.1 Elements of thread connection 2 4.2 Sealing element .2 4.3 Geometry of thread profile 2 4.4 Physical and mechanical requirements of the thread connection .7 5 Testing. .8 5.1 Visual inspection ..8 5.2 Circularity of threads. ..8 5.3 Geometry of male thread connector. ..9 5.4 Geometry of female thread connector. ..12 5.5 Beginning of the effective thread of the male connection ..16 5.6 Resistance of the connectors to pull forces .16 6 Marking and identification .17 Bibliography .18 iii ded by IHS under lic ense with ISt ithout license from IHS Not for Resale