1、BRITISH STANDARD Fasteners - Clearance holes for bolts and screws The European Standard EN 20273 : 1991 has the status of a British Standard Elments de fixation - Trous de passage pour boulons et -is Mechanische Verbindungselemente - Durchgangslcher fr Schrauben BS EN 20273 : 1992 IS0 273 : 1979 BSI
2、 BS*EN*20273 92 Lb24bb9 0284075 5 E BS EN 20273 : 1992 This British Standard, having been prepared under the direction of the General Mechnical Engineering Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 1 April 1992 O BSI 1992 The follow
3、ing BSI references relate to the work on this standard: Committee reference GME/9 Draft for comment 78170483 DC ISBN O 580 20714 5 Cooperating organizations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, compi-ises the national standard
4、s organizations of the following countries. Austria Belgium Denmark Finland France Germany Greece Iceland Ireland Italy Luxembourg Netherlands Norway Portugal Spain Sweden Switzerland United Kingdom Oesterreichisches Normungsinstitut Institut belge de normalisation Dansk Standardiseiingsraad Suomen
5、Standardisoimisliito, r. y. Association francaise de normalisation Deutsches Institut fr Normung e.V. Hellenic Organization for Standardization Technological Institute of Iceland National Standards Authority of Ireland Ente Nazionale Italiano di Unificazione Inspection du Travail et des Mines Nederl
6、ands Normalisatie-instituut Norges Standardisei-ingsforbund Instituto Portugus da Qualidade Asociacin Espaola de Normalizacin y Certificacin Standardiseringskommissionen i Sverige Association suisse de normalisation British Standards Institution Amendments issued since publication Amd. No. Date %xt
7、affected BSI BS*EN*20273 92 lb24bb9 028407b 7 BS EN 20273 : 1992 Contents Cooperating organizations National foreword Page Inside front cover i Foreword Text of EN 20273 National annex NA (informative) 2 3 Inside back cover National foreword This British Standard has been prepared under the directio
8、n of the General Mechanical Engineering Standards Policy Committee and is the English language version of EN 20273 : 1991, Fasteners - Clearance holes for bolts and screws, published by the European Committee for Standardization (CEN). It is identical with IS0 273 : 1979, published by the Internatio
9、nal Organization for Standardization (ISO). EN 20273 : 1991 was produced as a result of international discussion in which the UK took an active part. BS 4186 : 1984 was identical to IS0 273 : 1979 but is now superseded and withdrawn. Compliance with a British Standard does not of itself confer immun
10、ity from legal obligations. i ES1 BS*EN*20273 92 Lb24bb 0284077 9 W EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 20273 October 199 1 UDC 621.882.2 ; 621.882.15 Descriptors: Fasteners, bolts, screws, dimensions, hole size, dimensional tolerances English version Fasteners - Clearance holes for
11、 bolts and screws (IS0 273 : 1979) Elments de fixation - Trous de passage pour boulons et vis (IS0 273 : 1979) Mechanische Verbindungselemente - Durchgangslcher fr Schrauben (IS0 273 : 1979) This European Standard was approved by CEN on 1991-10-10. CEN members are bound to comply with the CENKENELEC
12、 Internal Regulations which 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
13、member. This European Standard 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. CEE mem
14、bers are the national standards bodies of Austria, Belgium, Denmark, Finland, fiance, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisc
15、hes Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O CEN 1991 Copyright reserved to all CEN members Ref. No. EN 20273 : 1991 E BSI BS*EN*20273 92 1b24bb 0284078 O Page 2 EN 20273 : 1991 Foreword In 1990, IS0 273 : 1979 was submitted to the CEN P.Q. procedure. Following t
16、he positive result of the P.Q., CEN/BT agreed to submit IS0 273 : 1979 with the following modifications to Formal Vote. In the French version, replace -boulon by vis, -boulon, vis by vis. In accordance with the Common CENKENELEC Rules, the following countries are bound to implement this European Sta
17、ndard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Swtizerland and United Kingdom. .Es1 BS*EN*Z0273 72 3624667 0284079 2 0 Page 3 EN 20273 : 1991 Fasteners - Clearance holes for bolts and screws 1 SCO
18、PE AND FIELD OF APPLICATION This International Standard specifies clearance hole diameters for general purpose applications. These values result from bearing area calculations in connection with IS0 bolt and nut product standards. NOTE - Clearance holes for special applications should be selected on
19、 the basis of design requirements. BSI BS*EN*20273 92 Lb24bb9 0284080 9 Page 4 EN 20273 : 1991 2 DIMENSIONS Dimensions in millimetres Thread Thread 1 Clearance hole dh Clearance holed, 1 1 diameter I Series : fine medium 1.4 1.5 1,6 1,6 1,7 13 1,8 2 2.1 2 2.2 2 -4 25 2.7 2 3 3 3.2 3.4 3,5 3.7 3,9 4
20、4,3 4,5 4.5 4.8 5 5 5.3 5.5 6 6.4 6.6 7 7.4 7.6 8 8.4 9 10 10.5 11 12 13 13,5 14 15 I 15.5 I 1 :it5 36 37 34 I 39 16 17 18 19 20 21 22 22 23 I 24 24 25 26 27 28 1 30 30 31 33 33 36 - 39 40 42 coarse 1.3 1.5 1.8 2 2 $2 2.6 3.1 3.6 4 2 4.8 5.3 5,8 7 8 10 12 14.5 16,5 18.5 21 24 26 28 32 1 35 38 42 45
21、I diameter I Series : 1 The following tolerance fields are given for information only, for use where it is desirable to specify tolerances : fine series : HI2 medium series : H13 coarse series : H14 In cases where it is necessary to avoid interference between the edge of the hole and the underhead f
22、illet of the bolt, a chamfer is recommended. BSI BS*EN*20273 92 = 1624667 0284083 O = BS EN 20273 : 1992 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the General Mechanical Engineering Standards
23、Policy Committee (GME/-) to Technical Committee GME/9, upon which the following bodies were represented: BEAMA Ltd. Biitish Constructional Steelwork Association Ltd. Biitish Industrial Fasteners Federation Biitish Railways Board British Steel Industry British Steel Industry (Wire Section) Gauge and
24、Tool Makers Association Ministry of Defence Society of Motor Manufacturers and Traders Ltd. Washer Manufacturers Association of Great Britain The following bodies also participated in the preparation of the standard, through subcommittees and panels: Defence Manufacturers Association General Municip
25、al Boilermaker and AUied Trades Union Screw Thread Tool Manufacturers Association Society of British Aerospace Companies Ltd. BSI BS*EN*20273 92 W lb24669 0284082 2 = BS EN 20273 : 1992 IS0 273 : 1979 BSI 2 Park Street London W1A 2BS BSI Linford Wood Milton Keynes MK14 6LE BSI - British Standards In
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