1、BS ISO 9974-4:2016 Connections 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 port plugs BSI Standards Publication WB11885_BSI_StandardCov
2、s_2013_AW.indd 1 15/05/2013 15:06BS ISO 9974-4:2016 BRITISH STANDARD National foreword This 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 It supersedes BS ISO 9974-4:2006 which is withdrawn.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, Conn
3、ectors and associated 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 Insti
4、tution 2016. Published by BSI Standards Limited 2016 ISBN 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. Amen
5、dments/corrigenda issued since publication Date T e x t a f f e c t e dBS ISO 9974-4:2016 ISO 2016 Connections 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 he
6、x and internal hex port plugs Raccordements 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 exte
7、rnes et six pans internes INTERNATIONAL STANDARD ISO 9974-4 Second edition 2016-12-01 Reference number ISO 9974-4:2016(E)BS ISO 9974-4:2016ISO 9974-4:2016(E)ii ISO 2016 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2016, Published in Switzerland All rights reserved. Unless otherwise specified
8、, no part of this publication may 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 m
9、ember body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax +41 22 749 09 47 copyrightiso.org www.iso.orgBS ISO 9974-4:2016ISO 9974-4:2016(E)Foreword iv Introduction v 1 Scope . 1 2 Normative references 1
10、3 Terms and definitions . 2 4 Dimensions . 2 4.1 Plug dimensions . 2 4.2 Hex tolerances . 2 4.3 Screw threads. 2 5 Requirements 2 5.1 Working pressures and working temperatures 2 5.2 Performance 2 6 Elastomeric sealing 3 7 Test methods . 3 8 Designation of port plugs 3 9 Manufacture 3 9.1 Constructi
11、on 3 9.2 Workmanship . 3 9.3 Finish . 4 10 Procurement information . 4 11 Marking 4 12 Identification statement (reference to this document) . 4 Annex A (informative) Elastomeric sealing for use with ISO 9974-4 port plugs 9 Bibliography .10 ISO 2016 All rights reserved iii Contents PageBS ISO 9974-4
12、:2016ISO 9974-4:2016(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
13、 a subject for which a technical committee has been established 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 Commiss
14、ion (IEC) on all matters of electrotechnical standardization. The 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 sho
15、uld be noted. This document was drafted in accordance with the editorial 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 i
16、dentifying any or all such patent rights. Details of any patent rights 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 con
17、venience of users and does not constitute an endorsement. For an explanation on the meaning of ISO specific terms and expressions related to conformit y assessment, as well as information about ISOs adherence to the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) s
18、ee the following URL: www.iso.org/iso/foreword.html. The committee responsible 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 constitute
19、s a minor revision with the following changes: A caution note has been 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) Introduction In flui
20、d power systems, power is transmitted and controlled through a fluid (liquid 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
21、 pipes or to hose fittings and hoses. Fluid ports are closed by inserting a 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 p
22、orts and stud ends with metric threads and O-ring sealing and because the subcommittee 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
23、be used for new designs in hydraulic fluid power applications; these International 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 a
24、nd 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 port plugs 1 Scope This document specifies dimensions and performance requirements for metric external hex a
25、nd internal hex port plugs for use with ISO 9974-1 ports. Port plugs in accordance with this document can be used at working pressures up to 63 MPa 630 bar 1) . The permissible working pressure depends upon the plug end size, materials, design, working conditions, application, etc. Conformance to th
26、e dimensional information in this document does not guarantee rated performance. NOTE 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 references The following documents are referred to in th
27、e text in such a way that some or all of their content constitutes requirements of this 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 thermoplasti
28、c Determination of hardness (hardness between 10 IRHD and 100 IRHD) ISO 261:1998, ISO general purpose metric screw threads General plan ISO 1629, Rubber and latices Nomenclature ISO 4042, Fasteners Electroplated coatings ISO 4759-1:2000, Tolerances for fasteners Part 1: Bolts, screws, studs and nuts
29、 Product grades A, B and C ISO 9227, Corrosion tests in artificial atmospheres Salt spray tests ISO 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 ports ISO 9974-2, Connections for general use a
30、nd fluid power Ports and stud ends with ISO 261 threads with elastomeric or metal-to-metal sealing Part 2: Stud ends with elastomeric sealing (type E) ISO 10683, Fasteners Non-electrolytically applied zinc flake coatings ISO 19879, Metallic tube connections for fluid power and general use Test metho
31、ds for hydraulic fluid power connections 1) 1 bar = 0,1 MPa = 10 5Pa; 1 MPa = 1 N/mm 2 . INTERNATIONAL ST ANDARD ISO 9974-4:2016(E) ISO 2016 All rights reserved 1BS ISO 9974-4:2016ISO 9974-4:2016(E) 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 559
32、8 and the following apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: IEC Electropedia: available at http:/ /www.electropedia.org/ ISO Online browsing platform: available at http:/ /www.iso.org/obp 3.1 plug stud end without fluid passage, use
33、d to contain hydraulic fluid 4 Dimensions 4.1 Plug dimensions External hex and internal hex plugs shall conform to the dimensions shown in Figure 1 and Figure 2 and given in Table 1 and Table 2, respectively. 4.2 Hex tolerances External hex tolerances across flats shall be in accordance with ISO 475
34、9-1:2000, product grade C. Minimum across corner dimensions are 1,092 times the nominal width across flats. The minimum 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
35、shall be chamfered 10 to 30 to a diameter equal to the width across flats, with a tolerance of mm. 4.3 Screw threads The screw threads on the plug shall be metric screw threads conforming to ISO 261:1998, class 6g. 5 Requirements 5.1 Working pressures and working temperatures External hex and intern
36、al hex plugs conforming to this document shall be suitable for use at the working pressures given in Table 3 when used 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 conta
37、in elastomeric seals. Unless otherwise specified, plugs are made and delivered with elastomeric seals for use within the 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
38、 temperature range or can render the plugs unsuitable for the application. Manufacturers may supply, upon request, plugs 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 Performance Ex
39、ternal hex and internal hex plugs conforming to this document shall meet the burst and impulse pressures given in Table 3, 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 9974-4:2016IS
40、O 9974-4:2016(E) 6 Elastomeric sealing Unless otherwise specified, for use at the pressure and temperature requirements in 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 re
41、levant dimensions given in ISO 9974-2 (see Annex A). 7 Test methods CAUTION The use of plugs conforming to this document with 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, cyc
42、lic endurance (impulse) and vacuum tests. The qualification test torques given in Table 4 shall be used in testing. Test results shall be reported on the test data form in ISO 19879. 8 Designation of port plugs Port plugs shall be designated by an alphanumeric code to facilitate ordering. They shall
43、 be designated by the word “Plug”, then a space followed by ISO 9974-4, then a dash, followed by the shape code PLEH for external 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 c
44、ode can be supplemented by a dash followed by the elastomeric sealing material code in accordance with ISO 1629, followed by a dash, 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
45、: Plug ISO 9974-4-PLEH-M12 EXAMPLE 2 Plug with an external hex for an ISO 9974-1 port size M12 1,5, ordered assembled with elastomeric sealing that conforms to the requirements of Clause 6 is designated as follows: Plug ISO 9974-4-PLEHS-M12 EXAMPLE 3 Plug with an internal hex for an ISO 9974-1 port
46、size M12 1,5, ordered assembled with elastomeric sealing that conforms to the requirements of Clause 6 but made of FKM instead of NBR is designated as follows: Plug ISO 9974-4-PLIHS-M12-FKM EXAMPLE 4 Plug with an internal hex for an ISO 9974-1 port size M12 1,5, ordered assembled with elastomeric se
47、aling that conforms to the requirements of Clause 6 and plated with galvanized zinc in accordance with ISO 4042 is designated as follows: Plug ISO 9974-4-PLIHS-M12-A3C 9 Manufacture 9.1 Construction Plugs may be made from low carbon steel by forming or machined from bar stock, unless otherwise recom
48、mended. 9.2 Workmanship Workmanship shall conform to the best commercial practice to produce high quality plugs. Plugs shall be free from visual 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,
49、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. 9.3 Finish The 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 fai
