1、O-ring Grooves Dimensions The European Standard EN 3748:2001 has the status of a British Standard ICs 49.030.99 BS EN 3748:2001 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 3748:2001 Amd. No. National foreword Date Comments This British Standard, having been prepared
2、under the direction of the Engineering Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 14 December 2001 This British Standard is the official English language version ofEN 3748:2001. The UKparticipation in its preparation was
3、entrusted to Technical Committee ACE/l2/l, Aerospace Fasteners, Fastening Systems, Details and Parts (International), which has the responsibility to: - - aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change,
4、 and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. - A list of organizations represented on this committee can be obtained on request to its secretary. Cr oss-r e fer enc e s The British Standards which implement international
5、or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all t
6、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, the EN title p
7、age, pages 2 to 29 and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. O BSI 14 December 2001 ISBN O 580 38773 9 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3748 November 2001 ICs 49.080 English version Aerospace series - O-ring g
8、rooves - Dimensions Srie arospatiale - Gorges pour joints toriques - Dimensions Luft- und Raumfahrt - Nuten fr O-Ringe - Mae This European Standard was approved by CEN on 11 August 2001. CEN members are bound to comply with the CENKENELEC Internal Regulations which stipulate the conditions for givin
9、g this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Management Centre or to any CEN member. This European Standard exists in three official versions
10、 (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech
11、Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION EUROPISCHES KOMITEE FR NORMUNG COMIT EUROPEN DE NORMALISATION Management Centre: rue de Stass
12、art, 36 B-1050 Brussels O 2001 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3748:2001 E EN 3748:2001 (E) Foreword This European Standard has been prepared by the European Association of Aerospace Manufacturers (AECMA). After inq
13、uiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentation to CEN. This European Standard shall be given the status of a nati
14、onal standard, either by publication of an identical text or by endorsement, at the latest by May 2002, and conflicting national standards shall be withdrawn at the latest by May 2002. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries a
15、re bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page 1 Scope 3 2 Normative references . 3 3 Symbo
16、ls . 3 4 4.1 4.1 .I 4.1.2 4.1.3 4.1.4 5 6 6.1 6.2 6.3 6.4 Required characteristics 3 Configuration - Dimensions - Tolerances . 3 Radial sealing - Rod housing: Configuration code A . 4 Radial sealing - Bore housing: Configuration code B 10 Axial sealing for internal pressure: Configuration code C . 1
17、6 Axial sealing for external pressure: Configuration code D 22 Designation 28 Drawing presentation . 28 Configuration code A 28 Configuration code B 28 Configuration code C 29 Configuration code D 29 2 EN 3748:2001 (E) 1 Scope This standard specifies the dimensions of grooves for use with O-rings ac
18、cording to EN-standards for aerospace applications: radial sealing: rod or bore mounted O-rings; axial sealing: internal or external pressure source. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These normative reference
19、s are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references, the lat
20、est edition of the publication referred to applies (including amendments) IS0 286-2 IS0 system of limits and fits - Part 2: Tables of standard tolerance grades deviations for holes and shafts EN 3049 Aerospace series - O-rings, in fluorocarbon rubber (FKM), low compression set - 80 IRHD and limit Ha
21、rdness EN 3746 Aerospace series - O-rings, in fluorosilicone rubber (FVMQ) - Hardness 80 IRHD 1) TR 4271 Aerospace series - O-rings grooves - Design criteria for O-ring grooves - Basic calculations 2) Symbols O-ring groove width O-ring inside diameter O-ring section diameter O-ring groove diameter,
22、rod mounted bore diameter, rod mounted rod outside diameter, bore mounted O-ring groove diameter, bore mounted O-ring groove outside diameter, internal pressure O-ring groove inside diameter, external pressure rod outside diameter, rod mounted bore diameter, bore mounted groove height edge radius on
23、 groove corner radius on groove housing depth lead-in chamfer length Required characteristics Configuration - Dimensions - Tolerances Only recommended sizes are given in the tables. They are applicable to EN 3049 and EN 3746. For other groove or O-ring, refer to TR 4271. Dimensions and tolerances ar
24、e in millimetres. Surface roughness values are in micrometres. 1) Published as AECMA Prestandard at the date of publication of this standard 2) Published as AECMA Technical Report at the date of publication of this standard 3 EN 3748:2001 (E) continuous pressure g5MPa 5MPa 32 1,6 1,6 4.1 .I This con
25、figuration corresponds to radial grooves in static applications, rod mounted. See figure 1 and tables 1 to 7 Radial sealing - Rod housing: Configuration code A with pressure variation g5MPa 5MPa 1,6 1,6 0,8 -+- continuous press u re g5MPa 5MPa 12,5 63 63 Key 1 O“to5“ 2 Bore 3 Rod 4 a See table 1. No
26、 burrs permitted in this area Groove diameter d3 2 50: maximum run-out tolerance Y = 0,025 Groove diameter d3 50: maximum run-out tolerance Y = 0.05 b with pressure variation g5MPa 5MPa 63 63 32 Figure 1 Table 1 Surface Side surfaces diameter Groove Homologous surface Roughness 4 EN 3748:2001 (E) d2
27、 nom. Table 2 b Z f-I max. I min. min. max. I min. R ,i. 1,80 2,65 3,515 5,30 7,OO 2,65 2,40 1 ,I 3,85 3,60 13 5,05 4,80 1,8 7,35 7,lO 2,7 9,45 9,20 36 12 08 0,4 02 0,8 0,4 A0280 A0315 28,OO 28,94 31,70 31,70 31,50 32,54 35,30 35,30 A0355 A0365 35,50 36,64 39,40 39,40 36,50 37,64 40,40 40,40 A0375 A
28、0387 37,50 38,64 41,40 41,40 38,70 39,84 42,60 42,60 4.1 .I .I Section diameter d2 = 1,80 Table 3 d4 d9 f7 di d3 Code” I nom. 0,06 O 7,00 A0040 A0050 8,03 I 1 9,06 9,06 A0060 A0069 10,oo 10,00 11,88 11,88 A0087 A01 06 13,78 13,78 10,60 11 ,o2 A0125 12,50 12,97 t 14,OO 14,54 A0140 17,30 A01 60 A01 80
29、 A0212 A0236 23,60 27,20 I 1 I 1 I 1 I 1 to aerospace series EN standards. See IS0 286-2. 5 EN 3748:2001 (E) 4.1 .I .2 Section diameter d2 = 2,65 Table 4 Code” I nom. Co, I f7 E1090 I 109,OO 112,06 I 123,40 I 123,40 E1250 125,OO 128,46 139,80 E1450 145,OO 148,96 160,30 El 650 165,OO 169,46 180,80 E1
30、750 I 175,OO 179,76 I 191,lO I 191,lO E1850 I 185,OO 189,96 I 201,30 I 201,30 E1900 I 190,OO 195,16 I 206,510 I 206,510 E2000 I 200,OO E2120 I 212,OO 217,66 I 229,OO I 229,OO E2240 I 224,OO 229,86 I 241,20 I 241,20 E2300 I 230,OO 236,16 I 247,510 I 247,510 E2430 I 243,OO 249,46 I 260,80 I 260,80 E25
31、00 I 250,OO 256,66 I 268,OO I 268,OO E2580 I 258,OO E2720 I 272,OO 279,26 I 290,60 I 290,60 E2800 I 280,OO 287,46 I 298,80 I 298,80 E2900 I 290,OO 297,66 I 309,OO I 309,OO E3000 I 300,OO 307,96 I 319,30 I 319,30 E3150 I 315,OO 323,36 I 334,70 I 334,70 E3250 I 325,OO 333,56 I 344,90 I 344,90 E3350 I
32、335,OO 343,86 I 355,20 I 355,20 E3450 I 345,OO 354,06 I 365,40 I 365,40 E3550 I 355,OO 364,36 I 375,70 I 375,70 E3650 I 365,OO 374,56 I 385,90 I 385,90 E3750 I 375,OO 384,86 I 396,20 I 396,20 E3870 I 387,OO 397,16 I 408,50 I 408,50 E4000 I 400,OO 410,46 I 421,80 I 421,80 a to aerospace series EN sta
33、ndards. Size code corresponding to the codification of O-rings, according See IS0 286-2. b 9 EN 3748:2001 (E) Surface Side surfaces Inside Groove 4.1.2 This configuration (not recommanded) corresponds to radial grooves in static applications, bore mounted. See figure 2 and tables 8 to 14. Radial sea
34、ling - Bore housing: Configuration code B Roughness Ra R continuous with pressure continuous with pressure pressure variation press u re variation g5MPa 5MPa g5MPa 5MPa g5MPa 5MPa g5MPa 5MPa max. 32 12,5 1,6 63 1,6 1,6 63 63 Key 1 O“to5“ 2 Rod 3 Bore 4 a See table 8. No burrs permitted in this area
35、Groove diameter d6 250: maximum run-out tolerance Y= 0,025 Groove diameter d6 50: maximum run-out tolerance Y= 0,05 b Figure 2 Table 8 10 EN 3748:2001 (E) 3,55 5,30 Table 9 5,05 4,80 1,8 7,35 7,lO 2,7 I d2 I b I= ri min. min. min. 7,OO I 9,45 I 9,20 I 3,6 4.1.2.1 Section diameter d2 = 1,80 Table 10
36、di Code” I nom. O - 0,04 + 0,06 O H8 A0040 I 4,OO 4,29 7,13 4,37 A0048 I 4.:8: A0056 5,15 7,99 5,23 5,84 8,68 5,92 A0067 I :7: A0080 6,86 9,70 6,94 8,24 8,16 11 ,o0 8,86 10,06 11,70 12,90 8,94 10,14 11,86 13,96 14,70 16,80 11,94 14,04 A0160 16,OO + A0180 18,OO 15,96 17,86 18,80 20,70 16,04 17,94 A02
37、00 20,OO + A0224 22,40 19,86 22,16 22,70 25,OO 19,94 22,24 A0250 25,OO + A0280 28,OO 24,66 27,66 27,50 30,50 24,74 27,74 A0325 32,50 + A0365 36,50 32,06 36,06 34,90 38,90 32,14 36,14 A0400 140,OO 39,36 42,20 39,44 a to aerospace series EN standards. Size code corresponding to the codification of O-r
38、ings, according See IS0 286-2. b 11 EN 3748:2001 (E) 4.1.2.2 Section diameter d2 = 2,65 Table 11 Code a + 0,07 O I H8b BO045 4,50 I 5,07 9,37 I 5,23 BO060 BO069 10,78 11,63 BO080 BO090 12,72 13,72 10,oo 10,32 + 11,80 12,12 14,62 10,48 + 16,42 12,28 BO1 O0 BO118 BO140 18,512 114,38 BO1 50 15,OO 115,2
39、2 19,52 115,38 BO1 80 18,OO 118,12 22,42 118,28 BO200 20,oo 120,12 24,42 120,28 BO224 22,40 122,42 26,72 122,58 BO250 25,OO 124,92 29,22 125,08 BO280 28,OO 127,92 32,22 128,08 BO325 32,50 132,12 36,42 132,28 BO365 36,50 136,12 40,42 136,28 BO400 40,OO 139,52 43,82 139,68 BO450 45,OO 144,42 48,72 144
40、,58 BO500 50,OO 149,32 53,62 149,48 BO560 56,OO 155,12 59,42 155,28 a to aerospace series EN standards. Size code corresponding to the codification of O-rings, according See IS0 286-2. b 12 EN 3748:2001 (E) CO300 CO355 4.1.2.3 Section diameter d2 = 335 30,OO 30,19 35,89 30,41 35,50 35,49 41,19 35,71
41、 Table 12 CO400 CO450 O + 0,08 Code” I nom. l-O,O6 I O I H8b 40,OO 39,89 4539 40,11 45,OO 44,79 50,49 45,01 CO250 I25,OO I25,29 I30,99 I25,51 CO500 CO560 50,OO 49,69 55,39 49,91 56,OO 55,49 61,19 55,71 CO630 I63,OO I62,29 I67,99 I62,51 CO710 I71,OO I70,19 17589 I70,41 co800 I80,oo I78,89 18439 I79,1
42、1 CO900 I90,OO I88,69 1943 I88,91 C1000 1100,OO I98,29 l103,99 19831 CI120 1112,OO 1109,99 1115,69 1110,21 a to aerospace series EN standards. Size code corresponding to the codification of O-rings, according See IS0 286-2. b 13 EN 3748:2001 (E) 4.1.2.4 Section diameter d2 = 5,30 Table 13 a to aeros
43、pace series EN standards. Size code corresponding to the codification of O-rings, according See IS0 286-2. b 14 EN 3748:2001 (E) E1250 E1400 4.1.2.5 Section diameter d2 = 7,OO 125,OO 125,78 137,56 126,22 140,OO 140,58 152,36 141 ,O2 Table 14 El 600 El 800 O + 0,11 Code” I nom. 1-0,09 I O I H8b 160,O
44、O 160,28 172,06 160,72 180,OO 179,98 191,76 180,42 E1090 I 109,OO I 109,98 I 121,76 I 110,42 E2000 E2240 200,oo 199,68 21 1,46 200,12 224,OO 223,48 235,26 223,92 E2500 I 250,OO I 248,98 I 260,76 I 249,42 E2800 I 280,OO I 278,48 I 290,26 I 278,92 E3250 I 325,OO I 322,98 I 334,76 I 323,42 E3650 I 365,
45、OO I 362,48 I 374,26 I 362,92 E4000 I 400,OO I 396,78 I 408,56 I 397,22 a to aerospace series EN standards. Size code corresponding to the codification of O-rings, according See IS0 286-2. b 15 EN 3748:2001 (E) h max. min. 1,38 1,28 2,07 1,97 2,85 2,75 4,34 4,24 5,82 5,72 4.1.3 This configuration co
46、rresponds to axial grooves in static applications, with internal pressure source. See figure 3 and tables 15 to 21. Axial sealing for internal pressure: Configuration code C ad2 f-I R max. min. max. min. o ,4 02 03 0,1 0,8 0,4 12 0,8 R n 7,OO P- 9,65 9,40 I 0 ri, k -I I ci Key 1 O“to5“ a See table 1
47、5. See table 15 for the homologous pressed on the seal. b Figure 3 Table 15 Surface Side surfaces diameter Groove Homologous surface continuous pressure 32 Roughness Ra I R min. 2,65 4,05 3,80 5,OO 7,30 max. with pressure continuous with pressure variation press u re variation Table 16 16 EN 3748:20
48、01 (E) 4.1.3.1 Section diameter d2 = 1,80 Table 17 a Size code corresponding to the codification of O-rings, according to aerospace series EN standards. See IS0 286-2. b 17 EN 3748:2001 (E) 4.1.3.2 Section diameter d2 = 2,65 Table 18 a Size code corresponding to the codification of O-rings, accordin
49、g to aerospace series EN standards. See IS0 286-2. b 18 EN 3748:2001 (E) 132,OO 4.1.3.3 Section diameter d2 = 335 139,lO Table 19 d7 HI1 1 di nom. I H:b I Code” I nom. Code ” Gpqm 140,OO 143,lO CO800 CO850 147,lO 152,IO CO900 CO950 157,IO 162,lO CI O00 CI 030 167,lO 172,lO CI 060 CI O90 177,lO 182,lO CI 120 CI150 187,lO 192,lO CI180 CI220 197,lO 125,OO Il32,lO I Ei: I 195,OO 128,OO 135,IO 200,oo CI250 CI280 202,lO 207,lO CI 320 ” Size code corresponding to the codification of O-rings, according to aerospace series EN standards. See IS0 286-2. b 19 EN 3748:2001 (E) 4.1.3.4
