1、BSI Standards PublicationBS EN 4234:2015Aerospace series Clamps,worm drive Dimensions,massesBS EN 4234:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 4234:2015. Itsupersedes BS EN 4234:2009 which is withdrawn.The UK participation in its preparation was ent
2、rusted to TechnicalCommittee ACE/12, Aerospace fasteners and fastening systems.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correc
3、tapplication. The British Standards Institution 2015. Published by BSI StandardsLimited 2015ISBN 978 0 580 87959 3ICS 49.030.99Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy C
4、ommittee on 31 July 2015.Amendments issued since publicationDate Text affectedBS EN 4234:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 4234 July 2015 ICS 49.030.99 Supersedes EN 4234:2009English Version Aerospace series - Clamps, worm drive - Dimensions, masses Srie arospatiale - Colliers
5、 vis tangente - Dimensions, masses Luft- und Raumfahrt - Schellen mit Schneckentrieb - Mae, Massen This European Standard was approved by CEN on 5 December 2014. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
6、 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 CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, F
7、rench, 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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgar
8、ia, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turk
9、ey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. R
10、ef. No. EN 4234:2015 EBS EN 4234:2015EN 4234:2015 (E) 2 Contents Page European foreword .3 1 Scope 4 2 Normative references 4 3 Design .4 4 Required characteristics .4 4.1 Configuration Dimensions Masses 4 4.2 Materials and surface treatment .7 4.3 Tightening torque 7 5 Designation 8 6 Marking .8 6.
11、1 Field 1 8 6.2 Field 2 8 7 Technical specification .8 Annex A (informative) Standard evolution form .9 Figures Figure 1 5 Tables Table 1 Dimensions5 Table 2 Clamp ranges and masses 6 Table 3 Configuration 6 Table 4 Materials and surface treatment .7 BS EN 4234:2015EN 4234:2015 (E) 3 European forewo
12、rd This document (EN 4234:2015) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations a
13、nd the Official Services of the member countries of ASD, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 2016, and conflicting national standards shall be
14、 withdrawn at the latest by January 2016. This document supersedes EN 4234:2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. Accor
15、ding to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany,
16、 Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 4234:2015EN 4234:2015 (E) 4 1 Scope This European Standard specifies the characteristi
17、cs of worm drive clamps designed for use with suitable rubber hoses to form joints in fluid system pipelines for aerospace applications. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dat
18、ed references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 2424, Aerospace series Marking of aerospace products EN 2465, Aerospace series Steel FE-PA3901 (X2CrNi18-9) Softened 450 MPa Rm 680 MPa Bar for
19、machining 4 mm De 100 mm EN 2516, Aerospace series Passivation of corrosion resisting steels and decontamination of nickel base alloys EN 3077, Aerospace series Clamps worm drive Technical specification 1)EN 3487, Aerospace series Steel FE-PA3601 (X6CrNiTi18-10) Air melted Softened Bar for machining
20、 a or D 250 mm 500 MPa Rm 700 MPa EN 3488, Aerospace series Steel FE-PA3601 (X6CrNiTi18-10) Air melted Softened Sheet and strip a 6 mm 500 MPa Rm 700 MPa EN 10088 (all parts), Stainless steels 3 Design The housing shall be firmly attached to the band. NOTE Clamps of form N are only equipped with a s
21、tamped band and undrilled, round-headed screw. 4 Required characteristics 4.1 Configuration Dimensions Masses The configuration shall correspond with Figure 1. Details of form not defined are at the manufacturers option. Dimensions shall correspond with Figure 1 and Table 1 to Table 3. Sharp edges a
22、re not permissible and the inner edges should be rounded or beaded. 1)Published as ASD-STAN Prestandard at the date of publication of this standard (http:/www.asd-stan.org/).BS EN 4234:2015EN 4234:2015 (E) 5 Key 1 Field 1 for marking 2 Field 2 for marking The band is serrated or not according the ma
23、nufacturer. Figure 1 Table 1 Dimensions Dimensions in millimetres Form b1b2b3b4b5b6d2d3e l1s t max. max. min. max. + 0,3 0 h13 0,05 max. h12 L 16 11,3 12 0,15 1,6 1,9 3,6 0,1 4 0,1 1,2 8 0,7 30 7 2,75 0,25 M a 10/16 to 16/27 10,9 8,9 8 0,15 1 1,2 2,7 0,1 3030,+6 20,8 1,35 0,27 M a23/35 to 380/400 12
24、 10 2,6 020,+7 22 1,6200,N 7,5 7,3 5 0120,+0,9 1 4 0,4 13 1,2020,+aAlternative tolerances for M 27; e = 0,6 0,05. BS EN 4234:2015EN 4234:2015 (E) 6 Table 2 Clamp ranges and masses Size code d1Mass a Size code d1Mass a min. max. N L M min. max. L M mm g/piece mm g/piece 011 7 11 3,6 190 170 190 55,0
25、39,4 014 9 14 3,8 200 180 200 56,0 016 10 16 7,9 210 190 210 58,0 019 10 19 4,0 220 200 220 60,0 022 12 b22 24,0 8,5 230 210 230 62,0 027 16 27 25,0 10,6 240 220 240 63,0 44,5 035 23 35 25,5 14,6 250 230 250 64,0 045 25 45 28,0 14,3 260 240 260 66,0 050 32 50 29,0 16,6 270 250 270 68,0 060 40 60 31,
26、0 17,9 280 260 280 70,0 49,5 070 50 70 33,0 19,3 290 270 290 72,0 080 60 80 35,0 20,6 300 280 300 74,0 090 70 90 38,0 21,9 310 290 310 75,0 100 80 100 40,0 24,7 320 300 320 76,0 54,5 110 90 110 41,0 26,1 330 310 330 77,0 120 100 120 44,0 27,1 340 320 340 79,0 130 110 130 45,0 30,7 350 330 350 80,0 1
27、40 120 140 47,0 360 340 360 82,0 59,5 150 130 150 49,0 34,8 370 350 370 83,0 160 140 160 50,0 380 360 380 84,0 170 150 170 52,0 390 370 390 85,0 180 160 180 54,0 400 380 400 86,0 64,5 a Calculated on the basis of a density of 7,85 kg/dm3.bFor form L: d1min. = 14. Table 3 Configuration Details of for
28、m Code Locking wire hole H (with locking wire hole) (without locking wire hole) Shape of head R (round) S (hexagonal) BS EN 4234:2015EN 4234:2015 (E) 7 4.2 Materials and surface treatment See Table 4. Table 4 Materials and surface treatment Material Corrosion resisting steel Surface treatment Code B
29、and Housing Screw According to EN 3488aAccording to EN 3488aAccording to EN 3487 a passivated according to EN 2516 According to EN 2465apassivated according to EN 2516 A According to EN 3487awithout B According to EN 2465awithout C aAlternative material according to EN 10088. 4.3 Tightening torque F
30、orm L: max. 6 Nm. Form M: max. 2,5 Nm. Form N: max. 0,8 Nm. BS EN 4234:2015EN 4234:2015 (E) 8 5 Designation EXAMPLE Description block CLAMP Identity block EN4234M035HRA Number of this standard Code letter for form (see Table 1) Size code (see Table 2) Code for locking wire hole (see Table 3) Code fo
31、r shape of head (see Table 3) Code optional for material and surface treatment (see Table 4) NOTE If necessary, the code I9005 shall be placed between the description block and the identity block. 6 Marking 6.1 Field 1 According to Figure 1. According to EN 2424, style C plus code letter of form L a
32、nd M; style F plus code letter of form N. 6.2 Field 2 According to Figure 1. Indication of the clamping range (d1 min./d1 max.); e. g. 10/16. 7 Technical specification According to EN 3077. BS EN 4234:2015EN 4234:2015 (E) 9 Annex A (informative) Standard evolution form MODIFICATION REASON AND VALIDA
33、TION Added alternative material according to EN 10088 into Table 4. Allowing alternative materials. Moved Design clause after clause 2. Reordered Chapters (was 3.4, now 3) This is introductory preamble & should be at the start of the spec, not at the end. Added a Hex plain view (no drill hole) to Fi
34、gure 1. Save confusion. Three end views of screw head were shown. Round plain & drilled. Hex drilled only. Added a Hex plain view (no drill hole) to save confusion. Table 1 Dimensions b4min. was added. No control of slots minimum width was given. Needs to accept standard screwdriver blades. This pag
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