1、BRITISH STANDARD AEROSPACE SERIES BS EN 3611:1995 Spigots Dimensionsand fit selection Designstandard The European Standard EN 3611:1995 has the status of a British Standard ICS: 49.040.20BSEN3611:1995 This British Standard, having been prepared under the directionof the Engineering SectorBoard, was
2、published underthe authority of the Standards Board and comes intoeffect on 15 November 1995 BSI 10-1999 The following BSI references relate to the work on this standard: Committee reference ACE/14 Draft for comment 88/76176 DC ISBN 0 580 24488 1 Committees responsible for this British Standard The
3、preparation of this British Standard was entrusted to Technical Committee ACE/14, Aerospace details and parts, upon which the following bodies were represented: British Iron and Steel Producers Association Civil Aviation Authority (Airworthiness Division) Federation of Wire Rope Manufacturers of Gre
4、at Britain Institute of Petroleum Ministry of Defence Society of British Aerospace Companies Limited Amendments issued since publication Amd. No. Date CommentsBSEN3611:1995 BSI 10-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 0 Introduction 3 1 Scope
5、3 2 Design 3 3 Required characteristics 4 4 Designation 5 5 Indication on drawings 5 Figure 1 External spigot code V 3 Figure 2 Internal spigot code W 3 Figure 3 External spigots 4 Figure 4 Internal spigots 4 Figure 5 5 Table 1 Spigot dimensions and fit selection 5BSEN3611:1995 ii BSI 10-1999 Nation
6、al foreword This British Standard has been prepared by Technical Committee ACE/14 and is the English language version of EN3611:1995 Aerospace series Spigots Dimensions and fit selection Design standard, published by the European Committee for Standardization (CEN). EN 3611 was produced as a result
7、of international discussions in which the United Kingdom took an active part. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself con
8、fer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages2 to5 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in t
9、he amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3611 July 1995 ICS 49.040.20 Descriptors: Aircraft industry, positioning, case, dimension, fit, design, designation English version Aerospace series Spigots Dimensions and fit selection Design standard
10、Srie arospatiale Pices de centrage Dimensions et slection dadjustement Norme de conception Luft und Raumfahrt Zentrierbunde Mae und Passungsauswahl Konstrucktionsnorm This European Standard was approved by CEN on1995-03-18. CEN members are bound to comply with the CEN/CENELEC Internal Regulations wh
11、ich stipulate the conditions for giving 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 Central Secretariat or to any CEN member. This European St
12、andard exists in three official versions (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 Central Secretariat has the same status as the official versions. CEN members are the national st
13、andards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung C
14、entral Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members. Ref. No. EN 3611:1995 EEN3611:1995 BSI 10-1999 2 Foreword This European Standard has been prepared by the European
15、Association of Aerospace Manufacturers (AECMA). After inquiries and votes carried out in accordance with the rules of this Association, this standard has successively received the approval of the National Associations and the Official Services of the member countries of AECMA, prior to its presentat
16、ion 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 January1996, and conflicting national standards shall be withdrawn at the lastest by January1996. According to the CEN/CENELEC Internal
17、Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.EN3611:1995 BSI 10-1999 3 0 Introduct
18、ion Tight fitting spigots may be used with casing flanges made of metallic materials to eliminate the need for close fitted bolts for radial location. 1 Scope This standard specifies the dimensions and fit selection of tight fitting spigots for locating casings and other major components for aerospa
19、ce applications. 2 Design The flanges shall be sufficiently flexible to accommodate the tight fitting spigot, together with differential strain when present, without permanent distortion. Three or more equally spaced jacking screw locations, or other features, shall be provided so that the flanges c
20、an readily be dismantled. Where jacking screws are to be used to bear onto light alloy faces, protection for the light alloy shall be provided to avoid damage. Two forms of spigot joints are shown inFigure 1 andFigure 2: external and internal. Advantages for the external spigot: it prevents lever be
21、ing used to separate; it stiffens the flange at the periphery; it can reduce the pitch circle diameter of the bolts thus improving the “heeling” factor. Advantages for internal spigot: it is less likely to be shop damaged and can be more easily protected; under pressure the use of an interference fi
22、t (seeTable 1) maintains a better seal; the flanges may be scalloped and are therefore lighter. Figure 1 External spigot code V Figure 2 Internal spigot code WEN3611:1995 4 BSI 10-1999 3 Required characteristics SeeFigure 3 andFigure 4 andTable 1. Dimensions and tolerances are in millimetres. 1)Tole
23、rances, seeTable 1. Figure 3 External spigots 1)Tolerances, seeTable 1. Figure 4 Internal spigotsEN3611:1995 BSI 10-1999 5 Table 1 Spigot dimensions and fit selection 4 Designation EXAMPLE: 5 Indication on drawings EXAMPLE: Alternatively, the spigot may be fully dimensioned on the drawing. A Fits B
24、C Tolerance classes Interference a Transition nom. male feature female feature Code Y Code Z min. 200 A k 500 r6 or k6 H7 H7/r6 H7/k6 4,5 0,15 4,5 500 A k 1 000 p7 or k7 H7/p7 H7/k7 5 0,25 5 1 000 A k 3 150 6,5 0,25 7 a Suitable for flanges having similar thermal expansion rates. Where these differ
25、significantly, it may be necessary to alter the diameter A of the male feature in order to ensure this fit at normal operating temperature. Figure 5 BS EN 3611:1995 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing
26、BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisions BritishStandards are updated by amendment or revision. Users of BritishStandards should make sure that they possess the latest amendments or editions. It is
27、 the constant aim of BSI to improve the quality of our products and services. We would be grateful if anyone finding an inaccuracy or ambiguity while using this BritishStandard would inform the Secretary of the technical committee responsible, the identity of which can be found on the inside front c
28、over. Tel:02089969000. Fax:02089967400. BSI offers members an individual updating service called PLUS which ensures that subscribers automatically receive the latest editions of standards. Buying standards Orders for all BSI, international and foreign standards publications should be addressed to Cu
29、stomer Services. Tel:02089969001. Fax:02089967001. In response to orders for international standards, it is BSI policy to supply the BSI implementation of those that have been published as BritishStandards, unless otherwise requested. Information on standards BSI provides a wide range of information
30、 on national, European and international standards through its Library and its Technical Help to Exporters Service. Various BSI electronic information services are also available which give details on all its products and services. Contact the Information Centre. Tel:02089967111. Fax:02089967048. Su
31、bscribing members of BSI are kept up to date with standards developments and receive substantial discounts on the purchase price of standards. For details of these and other benefits contact Membership Administration. Tel:02089967002. Fax:02089967001. Copyright Copyright subsists in all BSI publicat
32、ions. BSI also holds the copyright, in the UK, of the publications of the international standardization bodies. Except as permitted under the Copyright, Designs and Patents Act 1988 no extract may be reproduced, stored in a retrieval system or transmitted in any form or by any means electronic, phot
33、ocopying, recording or otherwise without prior written permission from BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols, and size, type or grade designations. If these details are to be used for any other purpose than implementation then the prior written permission of BSI must be obtained. If permission is granted, the terms may include royalty payments or a licensing agreement. Details and advice can be obtained from the Copyright Manager. Tel:02089967070.
