ISO INTERNATIONAL STANDARD 9974-3 Firstedition 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 3: Stud ends with metal-to-metal sealing (type B) Raccordements pourapplications genérales et transmissions hydrauliques -Orificesetélementsmalesafiletage/SO261et joint etpneumatiques- enélastomereouétancheitemetalsurmetal- Partie3:Elements males avec étancheite métal surmetal (type B) OSI Referencenumber ISO9974-3:1996(E) ISO9974-3:1996(E) Foreword erationof national standardsbodies(iSOmemberbodies).Theworkof preparing International Standards is normally carried out through IsO resentedonthatcommittee.Internationalorganizations,governmentaland non-governmental, in liaisonwithisO,alsotakepart inthework.isOcol- laboratescloselywiththeInternational ElectrotechnicalCommission (IEC) onallmattersof electrotechnical standardization. Draft International Standards adopted bythetechnical committees are cir- culated to the member bodies for voting.Publication as an International Standardrequiresapprovalbyatleast75%ofthememberbodiescasting a vote. International CommitteesISO/TC5,Ferrous metal pipesandmetallic fittings,Sub- committee SC5, Threaded or plain end butt-welding fittings, threads, gaugingofthreads,andsO/TC131,Fluidpowersystems,Subcommittee SC4,Connectorsandsimilarproductsandcomponents ISO9974consistsofthefollowingparts,underthegeneral titleConnec- tions forgeneral use and fluid power-Ports and stud endswithiO261 threads withelastomeric ormetal-to-metalsealing. Part1:Threadedports Part2:Studends with elastomeric sealing (type E) Part3:Studendswithmetal-to-metalsealing (typeB) The performance requirements,dimensions and designs are defined for port and stud end connections for the LandS series in ISO9974-2 and for the LL,LandS series inISO9974-3.Significanttestingover more than portandstud endconnections. StudendsconformingtoISO9974-2and9974-3areidentical to those conforming to DIN3852-1.ISO 9974-2 stud ends are used onISO8434-1 andiSO8434-4fittings,andISO9974-3studendsareusedonISO8434-1 fittings. AnnexAforms an integral part of thispart of ISO9974.AnnexB is for informationonly. ISO1996 All rights reserved.Unless otherwisespecified,nopart of thispublication maybe reproduced or utilized in any formorbyanymeans.electronic ormechanical,including photocopying and microfilm, without permission in writing from the publisher. InternationalOrganizationforStandardization CasePostale56.CH-1211Geneve20.Switzerland Printed in Switzerland Canvrinht Intarn @ISO IS09974-3:1996(E) Introduction Influidpowersystems,poweristransmitted and controlledthroughafluid (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 stud ends on fluid conductor fittings to tubes and pipes orto hose fittings and hoses. ii nizatinn fnr Stanrlarrlizatinr