ISO INTERNATIONAL STANDARD 21670 Second edition 2014-05-15 Fasteners Hexagon weld nuts with flange Fixations - Ecrous hexagonaux a souder, a embase plate Reference number ISO 21670:2014(E) IS02014 IS0 21670:2014(E) COPYRIGHTPROTECTEDDOCUMENT ISO2014 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyrightoffice Case postale 56 : CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland ii @ IS0 2014 - All rights reserved IS0 21670:2014(E) Contents Page Foreword ..iv 1 Scope .1 2 Normative references 3 Dimensions. 4 Technical delivery conditions .3 4.1 General requirements .3 4.2 Material... .3 4.3 Tolerances .3 4.4 Mechanical properties 4.5 Surfacefinish .3 4.6 Surface integrity ..4 4.7 Acceptance inspection 4 5 Designation ..4 6 Marking. ..4 7 Connecting dimensions .4 @ IS0 2014 - All rights reserved iii