ISO INTERNATIONAL STANDARD 9139 First edition 1998-12-15 Aerospace Nuts, plain or slotted (castellated) Procurement specification Aéronautique et espace - Ecrous ordinaires ou a créneaux- Spécificationd'approvisionnement ISO Reference number ISO9139:1998(E) by IHS under lic itted without license from IHS Not for Resale ISO 9139:1998(E) Contents 1Scope 2 Normative references 3 Terms and definitions 4 Quality assurance 4.1General. 4.1.1 Approval of manufacturers 3 4.1.2 Qualification of nuts 4.1.3 Production acceptance of nuts.. 4.2 Qualification inspection and test conditions. 4 4.3 Production acceptance inspection and test conditions.. 4.4 Use of "Statistical process control (SPC)".. .5 5 Technical requirement.. Annex A (normative) Types of permissible surface discontinuity. Annex B (informative) Cross-sectional area formula.. .18 @ISO1998 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 the publisher. International OrganizationforStandardization Case postale 56 . CH-1211 Geneve 20 · Switzerland Internet iso@iso.ch Printed in Switzerland Copyright International Organization for Standardization Not for Resale ISO 9139:1998(E) @ISO 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 committees. Each member body interested in a subject for which a technical committee has been established has liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission(lEC)onallmattersofelectrotechnicalstandardization. InternationalStandardsaredraftedinaccordancewiththerulesgivenintheISO/lECDirectives,Part3 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. International Standard ISO 9139 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles! Subcommittee SC 4, Aerospace fastener systems. Annex A forms an integral part of this International Standard. Annex B is for information only