ISO INTERNATIONAL STANDARD 8434-2 Second edition 2007-09-01 Metallic tube connections for fluid power and general use - Part 2: 37° flared connectors Raccordements de tubes métalliques pour transmissions hydrauliques et pneumatiques et applications générales - Partie 2: Connecteurs évasés a 37° Reference number ISO 8434-2:2007(E) @ ISO 2007 ISO 8434-2:2007(E) Contents Page Foreword IV Introduction 1 Scope 2 Normative references 3 Terms and definitions 4 Requirements for materials .. 5 Pressure/temperature requirements 6 Designation of connectors 7 Requirements for tubes 8 Across flats dimensions and tolerances 9 Design 0 10 Screw threads 10 11 Manufacture 12 Assembly instructions . 12 13 Procurement information. 12 14 Marking of components . 15 Performance and qualification test.... 16 Identification statement (reference to this part of ISO 8434)..... Annex A (normative) Length reduction factors for reducing connectors. 42 Bibliography.... @IsO 2007 -All rights reserved ii ISO 8434-2:2007(E) Foreword IsO (the International Organization for Standardization) is a worldwide federation of national standards bodies (lsOmember bodies).The work of preparing International Standards is normally carried out through SOtechnicalcommittees.Eachmemberbodyinterestedinasubjectforwhichatechnical committeehas 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. InternationalStandardsaredraftedinaccordancewiththerulesgivenintheISO/lECDirectives,Part2 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. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. IsO shall not be held responsible for identifying any or all such patent rights. ISO 8434-2 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 4, Connectors and similar products and components. This second edition cancels and replaces the first edition (IsO 8434-2:1994), which has been technically 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 connectors Part 3: O-ring face seal connectors Part 4: 24° cone connectors with O-ring weld-on nipple Part 6: 60° cone connectors with or without O-ring sealing @ ISO 2007 - All rights reserved ISO 8434-2:2007(E) Introduction In fluid power systems, power is transmitted and controlled through a fluid (liquid or gas) under pressure within rigid conductors; hoses are flexible conductors. This part of ISO 8434 is based on the US standard ANSI/SAE J514 [1]. The threads for the 37° flared connection are unified inch threads in accordance with IsO 263. The inch threads were not changed to metric existing applications without requiring a change to tube or hose assemblies. Also, the thread-to-nut overtorque themselves, connectors of this type match only to themselves and, other than having metric threads, no value in changing could be found. Major international companies that have used these connectors have adopted the design without noting any problems. All wrench flats specified in this part of IsO 8434 are dimensioned to be usedwithIsOstandardmetricwrenches @ Iso 2007 - All rights reserved INTERNATIONALSTANDARD ISO 8434-2:2007(E) Metallic tube connections for fluid power and general use - Part 2: 37° flared connectors Scope 37° flared connectors that are suitable for use with ferrous and non-ferrous tubes with outside diameters from limits of pressure and temperature specified in this part of isO 8434. performs satisfactorily, these values shall not be understood as guaranteed minimums. For every application, sufficient testing will need to be c