1、BS ISO 9974-4:2016Connections for general useand fluid power Ports andstud ends with ISO 261 threadswith elastomeric or metal-to-metal sealingPart 4: Dimensions, design, test methodsand requirements for external hex andinternal hex port plugsBSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.
2、indd 1 15/05/2013 15:06BS ISO 9974-4:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 9974-4:2016. It supersedes BS ISO 9974-4:2006 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee MCE/18/-/4, Connectors and as
3、sociated components.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016.Pub
4、lished by BSI Standards Limited 2016ISBN 978 0 580 94275 4 ICS 23.100.40 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 December 2016.Amendments/corrigenda i
5、ssued since publicationDate T e x t a f f e c t e dBS ISO 9974-4:2016 ISO 2016Connections for general use and fluid power Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing Part 4: Dimensions, design, test methods and requirements for external hex and internal hex po
6、rt plugsRaccordements pour applications gnrales et transmissions hydrauliques et pneumatiques Orifices et lments mles filetage ISO 261 et joint en lastomre ou tanchit mtal sur mtal Partie 4: Dimensions, conception, mthodes dessai et exigences des bouchons dorifice six pans externes et six pans inter
7、nesINTERNATIONAL STANDARDISO9974-4Second edition2016-12-01Reference numberISO 9974-4:2016(E)BS ISO 9974-4:2016ISO 9974-4:2016(E)ii ISO 2016 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in SwitzerlandAll rights reserved. Unless otherwise specified, no part of this publication m
8、ay be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of th
9、e requester.ISO copyright officeCh. de Blandonnet 8 CP 401CH-1214 Vernier, Geneva, SwitzerlandTel. +41 22 749 01 11Fax +41 22 749 09 47copyrightiso.orgwww.iso.orgBS ISO 9974-4:2016ISO 9974-4:2016(E)Foreword ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 24 Dimensions .
10、24.1 Plug dimensions . 24.2 Hex tolerances . 24.3 Screw threads. 25 Requirements 25.1 Working pressures and working temperatures 25.2 Performance 26 Elastomeric sealing 37 Test methods . 38 Designation of port plugs 39 Manufacture 39.1 Construction 39.2 Workmanship . 39.3 Finish . 410 Procurement in
11、formation . 411 Marking 412 Identification statement (reference to this document) . 4Annex A (informative) Elastomeric sealing for use with ISO 9974-4 port plugs 9Bibliography .10 ISO 2016 All rights reserved iiiContents PageBS ISO 9974-4:2016ISO 9974-4:2016(E)ForewordISO (the International Organiza
12、tion 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
13、has the right to be represented on that committee. International organizations, governmental 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.The
14、 procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the ed
15、itorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).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. Details of any patent ri
16、ghts identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents).Any trade name used in this document is information given for the convenience of users and does not constitute an endorsement.For an exp
17、lanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following URL: www.iso.org/iso/foreword.html.The committee res
18、ponsible for this document is 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 9974-4:2006), of which it constitutes a minor revision with the following changes: A caution note has been
19、added to Clause 7; ISO 9974-3 has been added to the Bibliography.A list of all parts in the ISO 9974 series can be found on the ISO website.iv ISO 2016 All rights reservedBS ISO 9974-4:2016ISO 9974-4:2016(E)IntroductionIn fluid power systems, power is transmitted and controlled through a fluid (liqu
20、id or gas) under pressure within an enclosed circuit. In general applications, a fluid can be conveyed under pressure.Components are connected through their threaded ports by stud ends on fluid conductor fittings to tubes and pipes or to hose fittings and hoses. Fluid ports are closed by inserting a
21、 plug into the port.For threaded ports and stud ends specified in new designs in hydraulic fluid power applications, ISO/TC 131/SC 4 recommends that the ISO 6149 series be used because these International Standards specify ports and stud ends with metric threads and O-ring sealing and because the su
22、bcommittee would like to help users by recommending one preferred system. ISO/TC 131/SC 4 further recommends that threaded ports and stud ends in accordance with the ISO 1179 series, ISO 9974 series and ISO 11926 series not be used for new designs in hydraulic fluid power applications; these Interna
23、tional Standards are maintained because they specify ports and stud ends that are currently used in hydraulic systems worldwide. ISO 2016 All rights reserved vBS ISO 9974-4:2016BS ISO 9974-4:2016Connections for general use and fluid power Ports and stud ends with ISO 261 threads with elastomeric or
24、metal-to-metal sealing Part 4: Dimensions, design, test methods and requirements for external hex and internal hex port plugs1 ScopeThis document specifies dimensions and performance requirements for metric external hex and internal hex port plugs for use with ISO 9974-1 ports.Port plugs in accordan
25、ce with this document can be used at working pressures up to 63 MPa 630 bar1). The permissible working pressure depends upon the plug end size, materials, design, working conditions, application, etc.Conformance to the dimensional information in this document does not guarantee rated performance.NOT
26、E The Introduction of this document gives recommendations for ports and stud ends to be used for new designs in hydraulic fluid power applications.2 Normative referencesThe following documents are referred to in the text in such a way that some or all of their content constitutes requirements of thi
27、s document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 48, Rubber, vulcanized or thermoplastic Determination of hardness (hardness between 10 IRHD and 100 IRHD)ISO 261:1998, ISO ge
28、neral purpose metric screw threads General planISO 1629, Rubber and latices NomenclatureISO 4042, Fasteners Electroplated coatingsISO 4759-1:2000, Tolerances for fasteners Part 1: Bolts, screws, studs and nuts Product grades A, B and CISO 9227, Corrosion tests in artificial atmospheres Salt spray te
29、stsISO 9974-1, 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 portsISO 9974-2, Connections for general use and fluid power Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sea
30、ling Part 2: Stud ends with elastomeric sealing (type E)ISO 10683, Fasteners Non-electrolytically applied zinc flake coatingsISO 19879, Metallic tube connections for fluid power and general use Test methods for hydraulic fluid power connections1) 1 bar = 0,1 MPa = 105Pa; 1 MPa = 1 N/mm2.INTERNATIONA
31、L STANDARD ISO 9974-4:2016(E) ISO 2016 All rights reserved 1BS ISO 9974-4:2016ISO 9974-4:2016(E)3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 5598 and the following apply.ISO and IEC maintain terminological databases for use in standardization at th
32、e following addresses: IEC Electropedia: available at http:/www.electropedia.org/ ISO Online browsing platform: available at http:/www.iso.org/obp3.1plugstud end without fluid passage, used to contain hydraulic fluid4 Dimensions4.1 Plug dimensionsExternal hex and internal hex plugs shall conform to
33、the dimensions shown in Figure 1 and Figure 2 and given in Table 1 and Table 2, respectively.4.2 Hex tolerancesExternal hex tolerances across flats shall be in accordance with ISO 4759-1:2000, product grade C. Minimum across corner dimensions are 1,092 times the nominal width across flats. The minim
34、um side flat is 0,43 times the nominal width across flats. Internal hex tolerances shall conform to ISO 4759-1:2000, product grade A. Unless otherwise specified or shown, hex corners shall be chamfered 10 to 30 to a diameter equal to the width across flats, with a tolerance of 040,mm.4.3 Screw threa
35、dsThe screw threads on the plug shall be metric screw threads conforming to ISO 261:1998, class 6g.5 Requirements5.1 Working pressures and working temperaturesExternal hex and internal hex plugs conforming to this document shall be suitable for use at the working pressures given in Table 3 when used
36、 at temperatures from 40 C to +120 C. For use at pressures and/or temperatures outside of this range, the manufacturer shall be consulted.Plugs conforming to this document may contain elastomeric seals. Unless otherwise specified, plugs are made and delivered with elastomeric seals for use within th
37、e specified working temperature range with petroleum-based hydraulic fluids. The use of these plugs and elastomeric seals with other hydraulic fluids can result in a reduced working temperature range or can render the plugs unsuitable for the application. Manufacturers may supply, upon request, plug
38、s with elastomeric seals for use with hydraulic fluids other than petroleum-based hydraulic fluids that meet the specified working temperature range of the plugs.5.2 PerformanceExternal hex and internal hex plugs conforming to this document shall meet the burst and impulse pressures given in Table 3
39、, and shall be capable of withstanding a vacuum of 6,5 kPa (0,065 bar) absolute pressure when tested in accordance with Clause 7.2 ISO 2016 All rights reservedBS ISO 9974-4:2016ISO 9974-4:2016(E)6 Elastomeric sealingUnless otherwise specified, for use at the pressure and temperature requirements in
40、5.1 and Table 3 and for testing, the elastomeric sealing shall be made of NBR (nitrile) with a hardness of (90 5) IRHD, measured in accordance with ISO 48, and conform to the relevant dimensions given in ISO 9974-2 (see Annex A).7 Test methodsCAUTION The use of plugs conforming to this document with
41、 ports conforming to ISO 1179-1, ISO 6149-1 and ISO 11926-1 could lead to a hazardous situation.Port plug tests shall be conducted in accordance with ISO 19879 for burst, cyclic endurance (impulse) and vacuum tests. The qualification test torques given in Table 4 shall be used in testing. Test resul
42、ts shall be reported on the test data form in ISO 19879.8 Designation of port plugsPort plugs shall be designated by an alphanumeric code to facilitate ordering. They shall be designated by the word “Plug”, then a space followed by ISO 9974-4, then a dash, followed by the shape code PLEH for externa
43、l hex plug or PLIH for internal hex plug, followed by sealing code S for plugs delivered with elastomeric sealing, then a dash, followed by the plug size. If desired, the code can be supplemented by a dash followed by the elastomeric sealing material code in accordance with ISO 1629, followed by a d
44、ash, followed by the plating code in accordance with ISO 4042 or ISO 10683.EXAMPLE 1 Plug with an external hex for an ISO 9974-1 port size M12 1,5 is designated as follows:Plug ISO 9974-4-PLEH-M12EXAMPLE 2 Plug with an external hex for an ISO 9974-1 port size M12 1,5, ordered assembled with elastome
45、ric sealing that conforms to the requirements of Clause 6 is designated as follows:Plug ISO 9974-4-PLEHS-M12EXAMPLE 3 Plug with an internal hex for an ISO 9974-1 port size M12 1,5, ordered assembled with elastomeric sealing that conforms to the requirements of Clause 6 but made of FKM instead of NBR
46、 is designated as follows:Plug ISO 9974-4-PLIHS-M12-FKMEXAMPLE 4 Plug with an internal hex for an ISO 9974-1 port size M12 1,5, ordered assembled with elastomeric sealing that conforms to the requirements of Clause 6 and plated with galvanized zinc in accordance with ISO 4042 is designated as follow
47、s:Plug ISO 9974-4-PLIHS-M12-A3C9 Manufacture9.1 ConstructionPlugs may be made from low carbon steel by forming or machined from bar stock, unless otherwise recommended.9.2 WorkmanshipWorkmanship shall conform to the best commercial practice to produce high quality plugs. Plugs shall be free from vis
48、ual contaminants, all hanging burrs, loose scale and slivers which can be dislodged in ISO 2016 All rights reserved 3BS ISO 9974-4:2016ISO 9974-4:2016(E)use, and any other defects that can affect the function of the parts. Unless otherwise specified, surface finish on all surfaces shall be Ra 6,3 m.
49、9.3 FinishThe external surface and threads on all port plugs shall be protected with an appropriate coating to pass a minimum 72-h salt spray test in accordance with ISO 9227, unless otherwise agreed upon by the manufacturer and the user. Any appearance of red rust during the salt spray test shall be considered failure.Corrosion protection requirements do not apply to corners or edges such as hex points, serrations, the crest of threads and areas where the parts are suspe
