291 9006590 E06759h 96 1-h266 051 INTERNATIONAL ISO STANDARD 9974-1 First edition 1996-04-15 Connections for general use and fluid power --- Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing -- Part 1: Threaded ports Raccordements pour applications generales et transmissions hydrauliques et pneumatiques - Orifices et élements males a filetage IsO 261 et joint en élastomere ouétanchéite métal sur meétal - Partie 1: Orifices filetés ISO Reference number ISO9974-1:1996(E) Copyright International Organization for Standardization No reproduc Not for Resale 4851903 0659007 I50 9974-1 96 919 ISO 9974-1:1996(E) Foreword ISO (the International Organization for Standardization) is a worldwide fed- preparing International Standards is normally carried out through IsO technical committees.Eachmemberbodyinterestedinasubjectfor resented on that committee. International organizations, governmental and non-governmental, in liaison with isO, aiso take part in the work. IsO col- laborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standards adopted by the 'technical committees are cir- culated to the member bodies for voting.. Publication as an International Standard requires approval by at least 75 % of the member bodies casting avote. Committees iSO/TC 5, Ferrous metal pipes and metallic fittings, Sub- committee sc 5, Threaded or plain end butt-welding fittings, threads, gauging of threads, and IsO/TC 131, Fluid power systems, Subcommittee Sc 4, Connectors and similar products and components. IsO 9974 consists of the following parts, under the general title Connec- threads with elastomeric or metal-to-metal sealing. Part 1: Threaded ports Part 2: Stud ends with elastomeric sealing (type E) Part 3: Stud ends with metal-to-metal sealing (type B) The performance requirements, dimensions and designs are defined for port and stud end connections for the L and S series in ISO 9974-2 and for the LL, L and S series in ISO 9974-3. Significant testing over more than 3o years of use has confirmed the performance requirements of these portand stud end connections. Stud ends conforming to ISO 9974-2 and 9974-3 are identical to those conforming to DIN 3852-1. ISO 9974-2 stud ends are used on ISO 8434-1 and ISO 8434-4 fittings, and ISO 9974-3 stud ends are used on ISO 8434-1 fittings. Annex A of this part of ISO 9974 is for information only. @ISO1996 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. InternationalOrganizationfor Standardization CasePostale56·CH-1211Geneve20.Switzerland Printed in Switzerland Copyright International Organization for Standardizatior out license from IHS Not for Resale 96 {-h26b OSI 48519030659008855 @ISO IS09974-1:1996(E) Introduction In fluid power systems, power is transmitted and controlled through a fluid (liquid or gas) under pressure within an enclosed circuit. In general appli- cations, a fluid may be conveyed under pressure. Components are connected through their threaded ports by fluid conduc- tor fittings to tubes and pipes or to hose fittings and hoses. Ports are an integral part of fluid power components, such as pumps. motors, valves, cylinders, etc. ii Not for Resale