1、BRITISH STANDARD BS EN 20273: 1992 ISO 273:1979 Fasteners Clearance holes for bolts and screws The European Standard EN 20273:1991 has the status of a British StandardBSEN 20273:1992 This British Standard, having been prepared under the directionof the General MechnicalEngineering StandardsPolicy Co
2、mmittee, waspublished under the authorityof the Standards Boardand comes into effect on 1April1992 BSI 12-1998 The following BSI references relate to the work on this standard: Committee reference GME/9 Draft for comment 78/70483 DC ISBN 0 580 20714 5 Cooperating organizations The European Committee
3、 for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries. Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation Denmark Dansk Standardiseringsraad Finland Suomen Sta
4、ndardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority of Ireland Italy Ente Nazionale Italiano di Unificazione Lu
5、xembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Sweden Standardiseringskommissionen i Sverige Switzerland Association suisse
6、 de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN 20273:1992 BSI 02-1999 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 Text of EN 20273 3 National annex NA (informative) Inside
7、back coverBSEN20273:1992 ii BSI 02-1999 National foreword This British Standard has been prepared under the direction of the General Mechanical Engineering Standards Policy Committee and is the English language version of EN20273:1991, “Fasteners Clearance holes for bolts and screws”, published by t
8、he European Committee for Standardization (CEN). It is identical with ISO273:1979, published by the International Organization for Standardization (ISO). EN20273:1991 was produced as a result of international discussion in which the UK took an active part. BS4186:1984 was identical to ISO273:1979 bu
9、t is now superseded and withdrawn. 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 confer immunity from legal obligations. Summar
10、y of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages2to4, 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
11、theinside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 20273 October 1991 UDC 621.882.2:621.882.15 Descriptors: Fasteners, bolts, screws, dimensions, hole size, dimensional tolerances English version Fasteners Clearance holes for bolts and screws (ISO 273:1979) Elments de fixatio
12、n Trous de passage pour boulons et vis (ISO 273:1979) Mechanische Verbindungselemente Durchgangslcher fr Schrauben (ISO273:1979) This European Standard was approved by CEN on 1991-10-10. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for givi
13、ng 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 Standard exists in three official versi
14、ons (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 standards bodies of Austria, Belgium, D
15、enmark, 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 Central Secretariat: rue de Stassart 3
16、6, B-1050 Brussels CEN 1991 Copyright reserved to all CEN members Ref. No. EN 20273:1991 EEN20273:1991 BSI 02-1999 2 Foreword In 1990, ISO273:1979 was submitted to the CEN P.Q. procedure. Following the positive result of the P.Q., CEN/BT agreed to submitISO 273:1979 with the following modifications
17、to Formal Vote. In the French version, replace “boulon” by “vis”, “boulon, vis” by “vis”. In accordance with the Common CEN/CENELEC Rules, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxe
18、mbourg, Netherlands, Norway, Portugal, Spain, Sweden, Swtizerland and United Kingdom. Contents Page Foreword 2 1 Scope and field of application 3 2 Dimensions 3EN20273:1991 BSI 02-1999 3 1 Scope and field of application This International Standard specifies clearance hole diameters for general purpo
19、se applications. These values result from bearing area calculations in connection with ISO bolt and nut product standards. NOTEClearance holes for special applications should be selected on the basis of design requirements. 2 Dimensions Dimensions in milimetres Thread diameter d Clearance hole d h T
20、hread diameter d Clearance hole d h Series: Series: fine medium coarse fine medium coarse 1 1,1 1 2 1,3 42 43 45 48 1,2 1,3 1,4 1,5 45 46 48 52 1,4 1,5 1,6 1,8 48 50 52 56 1,6 1,7 1,8 2 52 54 56 62 1,8 2 2,1 2,2 56 58 62 66 2 2,2 2,4 2,6 60 62 66 70 2 5 2,7 2,9 3,1 64 66 70 74 3 3,2 3,4 3,6 68 70 74
21、 78 3,5 3,7 3,9 4,2 72 74 78 82 4 4,3 4,5 4,8 76 78 82 86 4,5 4,8 5 5,3 80 82 86 91 5 5,3 5,5 5,8 85 87 91 96 6 6,4 6,6 7 90 93 96 101 7 7,4 7,6 8 95 98 101 107 8 8,4 9 10 100 104 107 112 10 10,5 11 12 105 109 112 117 12 13 13,5 14,5 110 114 117 122 14 15 15,5 16,5 115 119 122 127 16 17 17,5 18,5 12
22、0 124 127 132 18 19 20 21 125 129 132 137 20 21 22 24 130 134 137 144 22 23 24 26 140 144 147 155 24 25 26 28 150 155 158 165 27 28 30 32 30 31 33 35 33 34 36 38 36 37 39 42 39 40 42 45EN20273:1991 4 BSI 02-1999 The following tolerance fields are given for information only, for use where it is desir
23、able to specify tolerances: fine series: H12 medium series: H13 coarse series: H14 In cases where it is necessary to avoid interference between the edge of the hole and the underhead fillet of the bolt, a chamfer is recommended.BSEN 20273:1992 BSI 02-1999 National annex NA (informative) Committees r
24、esponsible The United Kingdom participation in the preparation of this European Standard was entrusted by the General Mechanical Engineering Standards Policy Committee (GME/-) to Technical Committee GME/9, upon which the following bodies were represented: BEAMA Ltd. British Constructional Steelwork
25、Association Ltd. British Industrial Fasteners Federation British Railways Board British Steel Industry British Steel Industry (Wire Section) Gauge and Tool Makers Association Ministry of Defence Society of Motor Manufacturers and Traders Ltd. Washer Manufacturers Association of GreatBritain The foll
26、owing bodies also participated in the preparation of the standard, through subcommittees and panels: Defence Manufacturers Association General Municipal Boilermaker and Allied Trades Union Screw Thread Tool Manufacturers Association Society of British Aerospace Companies Ltd.BSI 389 Chiswick High Ro
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