1、BRITISH STANDARD BS7417:1991 Specification for Interface dimensions of flat face “O”-ring seal hydraulic couplingsBS7417:1991 This British Standard, having been prepared under the directionof the Machinery andComponents Standards PolicyCommittee, was publishedunder the authorityofthe Standards Board
2、and comes intoeffect on 30April1991 BSI11-1999 The following BSI references relate to the work on this standard: Committee reference MCE/18 Draft for comment90/71490 DC ISBN 0 580 19386 1 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the M
3、achinery and Components Standards Policy Committee (MCE/-) to Technical Committee MCE/18, upon which the following bodies were represented: Advanced Manufacturing Technology Research Institute Association of British Mining Equipment Companies Bath University Library British Compressed Air Society Br
4、itish Fluid Power Association British Hydromechanics Research Association British Steel Industry Department of Trade and Industry (National Engineering Laboratory) Institution of Mechanical Engineers Ministry of Defence The following bodies were also represented in the drafting of the standard, thro
5、ugh subcommittees and panels: British Industrial Truck Association British Rubber Manufacturers Association Engineering Equipment and Materials Users Association Amendments issued since publication Amd. No. Date CommentsBS7417:1991 BSI 11-1999 i Contents Page Committees responsible Inside front cove
6、r Foreword ii 1 Scope 1 2 Dimensions 1 3 Screw threads 1 4 Thread undercuts 1 5 “O”-ring sealing surfaces 1 Appendix A Examples of flat face “O”-ring seal component combinations 4 Figure 1 Details of fitting end, sleeve and nut interfaces 2 Figure 2 Examples of component combinations 4 Table 1 Inter
7、face dimensions for fitting end, sleeve and nut 3 Publications referred to Inside back coverBS7417:1991 ii BSI 11-1999 Foreword This British Standard has been prepared under the direction of the Machinery and Components Standards Policy Committee. It is based upon proposals under consideration by Co
8、mmittee TC131/SC4 of the International Organization for Standardization (ISO) and also upon the Society of Automotive Engineers Inc. publication SAE Standard J1453 JUL87. Methods of testing hydraulic couplings are described in DD195-1 and DD195-2. A British Standard does not purport to include all t
9、he necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pagesi andii,
10、pages1 to4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS7417:1991 BSI 11-1999 1 1 Scope This British Standard specifies the basic interfa
11、ce dimensions necessary to ensure interchangeability of hydraulic connectors and adaptors for connecting rigid and flexible tubing to hydraulic fluid power system components. Examples of flat face “O”-ring seal component combinations are given in Appendix A. NOTEThe titles of the publications referr
12、ed to in this standard are listed on the inside back cover. 2 Dimensions The dimensions and details of the interface dimensions of the fitting end, the sleeve (or hose nipple) and nut shall be as shown in Figure 1 and in accordance with those given in Table 1. 3 Screw threads All screw threads shall
13、 comply with BS1580-1 b) class2B for internal threads. 4 Thread undercuts All thread undercuts shall be of form B complying with BS1936-1. 5 “O”-ring sealing surfaces When measured in accordance with BS1134-1, all “O”-ring sealing surfaces shall have a surface texture of3.2m R a . BS 7417:1991 2 BSI
14、 11-1999 NOTEDimensions J and K are critical for high pressure applications. Figure 1 Details of fitting end, sleeve and nut interfacesBS 7417:1991 BSI 11-1999 3 Table 1 Interface dimensions for fitting end, sleeve and nut Thread adesignation Hose inside diameter A B C D E F G H J K L “O”-ring size
15、no. b Tolerances nom. min. nom. min. +0 0.13 nom. 0.13 0.13 0.13 0.13 mm mm mm mm mm mm mm mm mm mm mm mm 6.3 9.4 8.2 2.1 11.00 0.08 12.75 17 4.0 12.27 0.13 1.00 9.5 011 10.0 10.8 9.5 2.4 12.60 0.08 15.75 22 4.5 15.21 0.13 1.00 9.5 012 12.5 12.4 11.0 2.4 15.77 0.08 18.92 24 5.0 18.39 0.13 1.00 9.5 0
16、14 114UNS 16.0 15.1 13.5 2.7 19.00 0.08 23.44 30 6.0 22.86 0.25 1.50 10.5 22.61 016 19.0 16.6 14.5 3.2 22.17 0.10 27.86 36 6.5 27.25 0.25 1.50 14.0 27.00 018 25.0 17.1 14.8 3.2 26.87 0.10 34.21 41 7.0 33.60 0.25 1.50 15.5 33.35 021 31.5 17.1 14.8 3.2 33.25 0.13 40.56 50 7.0 39.98 0.25 1.50 15.5 39.7
17、3 025 212UN 38.1 17.1 14.8 3.2 41.17 0.13 48.51 60 7.0 47.90 0.25 1.50 15.3 47.65 029 a In accordance with BS1580-1 & BS1580-2. b In accordance with BS1806. 9 16 -18 UNF 11 16 -16 UNF 13 16 -16 UN 1 3 16 -12 UN 1 7 16 -12 UN 1 11 16 - 12 UN BS7417:1991 4 BSI 11-1999 Appendix A Examples of flat face
18、“O”-ring seal component combinations Examples of how metric or inch tubing can be accommodated with the same fitting and nut by means of different sleeves are shown in Figure 2. Also shown in Figure 2 is a sleeve/nipple for hose assemblies. Figure 2 Examples of component combinationsBS7417:1991 BSI
19、11-1999 Publications referred to BS1134, Assessment of surface texture. BS1134-1, Methods and instrumentation. BS1580, Specification for unified screw threads. BS1580-1 & BS1580-2, Diameter ! in and larger. BS1806, Specification for dimensions of toroidal sealing rings (“O”-rings) and their housings
20、 (inch series). BS1936, Specification for undercuts and runouts for screw threads. BS1936-1, Inch screw threads. DD195, Hydraulic couplings. DD195-1, Method of test for coupling port threads and their seals intended for use in fluid power systems 1) . DD195-2, Method of test for couplings intended f
21、or use in fluid power systems 1) . SAE J1453 JUL87, Fitting “O”-ring face seal 1)2) . 1) Referred to in the foreword only. 2) Published by the Society of Automotive Engineers Inc.,400 Commonwealth Drive, Warrendale, PA15096, USA.BS7417:1991 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandard
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