ISO INTERNATIONAL STANDARD 11926-1 First edition 1995-05-01 Connections for general use and fluid power — Ports and stud ends with IsO 725 threads and O-ring sealing - Part 1: Ports with O-ring seal in truncated housing Raccordements pour applications génerales et transmissions hydrauliques et pneumatiques Orifices et élements males a filetage ISO 725 et joint Partie 1: Orifices a joint torique dans un logement tronconique ISO Reference number ISO 11926-1:1995(E) ISO11926-1:1995(E) 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 the right to be and non-governmental, in liaison with IsO, also take part in the work. IsO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. 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 11926-1 was prepared jointly by Technical Committees :ISO/TC 131,Fluid power systems, Subcommittee SC 4, Connectors and similar products and components and isO/TC 5, Ferrous metal pipes and metallic fittings. nections for general use and fluid power -Ports and stud ends with IsO 725 threads and O-ring sealing: Part 1: Ports with O-ring seal in truncated housing - Part 2: Heavy-duty (S series) stud ends Part3:Light-duty(Lseries)studends Annex A of this part of ISO 11926 is for information only. ISO 1995 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 Organization for Standardization Case Postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland ii SO ISO 11926-1:1995(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 connec- 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. i