ISO INTERNATIONAL STANDARD 8434-3 Second edition 2005-07-15 Metallic tube connections for fluid power and general use - Part 3: O-ring face seal connectors Raccordements de tubes métalliques pour transmissions hydrauliques et pneumatiques et applications générales - Partie 3: Connecteurs a joints faciaux toriques Reference number ISO 8434-3:2005(E) @ISO2005 ISO 8434-3:2005(E) Contents Page Foreword. Introduction 1 Scope 2 Normative references 3 Terms and definitions 4 Materials 4.1 General. 4.2 Connector bodies 4.3 4.4 O-rings. 5 Pressure/temperature requirements. 6 Designation of connectors . 7 Requirements for tubes. 8 Across-flats dimensions and tolerances 9 Design.. 8 9.1 Connectors 8 9.2 Dimensions. 8 9.3 Passage tolerance 9.4 Angular tolerances ... 9.5 Contour details... 9.6 Stud ends..... 9.7 10 Screw threads . 10.1 O-ring face seal ends... 10.2 Stud ends (connection ends) . 9 11 Manufacture. 11.1 Construction.... 9 11.2 Workmanship 11.3 Finish... 11.4 Connector protection 9 11.5 Corners. 12 Assembly instruction . 10 13 Procurement information. 14 Marking of components . 10 15 Performance and qualification test...... 15.1 Performance requirements .... 15.2 Test data form .......... 12 16 Identification statement (reference to this part of IsO 8434) .... 12 Annex A (normative) Specification for 1-14 UNs inch screw threads - Basic dimensions.... Annex B (normative) Reduction factors for reducing connectors... ... 46 Annex C (normative) Formed tube connection for Iso 8434-3 O-ring face seal connectors.... @ Is0 2005-All rights reserved ili ISO 8434-3:2005(E) Annex D (informative) O-ring face seal tube and hose connections with metric or inch tubing or swivel hose connector.... ...58 .... 59 Annex F (informative) Assembly instructions for adjustable connectors in Iso 6149-1 ports ..... 62 iv @ ISO 2005 - All rights reserved ISO 8434-3:2005(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 technicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnicalcommitteehasbeer 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. International Standards are drafted in accordance with the rules given in the ISO/lEC Directives, Part 2. The main task of technical committees is to prepare International Standards. 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. rights. Iso shall not be held responsible for identifying any or all such patent rights. ISO 8434-3 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 4, Connectors and similar products and components. revised. IsO 8434 consists of the following parts, under the general title Metallic tube connections for fluid power and generaluse: Part 1: 24° cone connectors Part 2: 37° flared fittings Part 3: O-ring face seal connectors Part 4: 24° cone connectors with O-ring weld-on nipples1) Part 5: Test methods for threaded hydraulic fluid power connections2) Part 6: 60° cone connectors with or without O-ring 1)ISO 8434-4 will be incorporated into the revision of IsO 8434-1. 2) ISO 8434-5 will be withdrawn once ISO 19879 is published @ ISO 2005 - All rights reserved ISO 8434-3:2005(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 applications, a fluid may be conveyed under pressure. hoses). Tubes are rigid conductors; hoses are flexible conductors. This part of ISO 8434 is based on the USA standard ANSI/SAE J1453. The threads for the O-ring face