1、 - CEN EN*IS0*4757 94 W 340i.1589 0084902 T44 BRITISH STANDARD Cross recesses for screws The European Standard EN IS0 4757 : 1994 has the status of a British Standard UDG 621.882.216.6 BS EN IS0 4757 : 1995 - -_ - _ CEN EN*IS0*4757 94 = 3404589 0084903 980 BS EN IS0 4757 : 1995 Cooperating organiz
2、ations The European Committee for Standardization (CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Belgium Denmark Finland France Germany Greece Iceland Ireland Italy Luxembourg Netherlands Norway P
3、ortugal Spain Sweden Switzerland United Kingdom Oesterreichisches Noimungsinstitut Institut belge de normalisation Dansk Standard Suomen Standardisoimisluto, r.y. Association francaise de normalisation Deutsches Institut fr Normung e.V. Hellenic Organization for Standardization Technological Institu
4、te of Iceland National Standards Authority of Ireland Ente Nazionale Italiano di Unificazione Inspection du Travail et des Mines Nederlands Noimalisatie-instituut Norges Standardiseringsforbund Instituto Portugus da Qualidade Asociacin Espaola de Normalizacin y Certificacin Standardiseringskommissio
5、nen i Sverige Association suisse de normalisation British Standards Institution This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 January 1996 O BSI 1995 Amendments iss
6、ued since publication No* I Date I lkxt affected The following BSI references relate to the work on this standard: Committee reference GME/S Draft for comment 82/70263 DC ISBN O 680 23626 9 I_ - - - - CEN EN*IS0*4757 94 3404587 0084904 817 BS EN IS0 4757 : 1995 Contents Page Cooperating organization
7、s Inside front cover National foreword i Foreword 2 Specification 1 Scope and field of application 3 2 Recess type H 3 3 Recess type Z 7 1 Recess type H 4 2 Gauge dimensions for recess type H G 4 Gauge dimensions for recess type Z 10 Pables 3 Recess type Z 8 National annex NA (informative) Committee
8、s responsible Inside back cover National foreword This British Standard has been prepared under the direction of the Engineering Sector Board and is the English language vewion of EX IS0 4757 : 1994 Cross -vcessesjior scrf?ius, published by the European Coininittee for Standardization (CEN). It is i
9、dentical with-IS0 4757 : 1983, published by the International Organization for Standardization (ISO). EN IS0 4757 : 1994 was produced as a result of international discussions in which the United Kingdoiii took an active pai-t. Compliance with a British Standard does not of itself confer immunity fro
10、m legal obligations. i CEN EN*IS0*4757 74 W 3404589 0084905 753 EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN IS0 4757 July 1994 UDC 62 1.882.2 15.6 Descriptors: fasteners, screws, cruciform recessed screws, dimensioiis English version Cross recesses for screws (IS0 4757 : 1983) Empreintes cr
11、uciformes pour vis (IS0 4757 : 1983) Kreuzschlitze fr Schrauben (:IS0 4757 : 1983) This European Standard was approved by CEN on 1994-07-26. CEN members are bound to comply with the CENXENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a natio
12、nal 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 versions (English, French, German). A version in any
13、 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 21s the official versions. CEN members are the national stanldards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ice
14、land, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee or Standardbation Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1994 Copyright reserved to
15、 CEN members Ref. No. EN IS0 4757 : 1994 E CEN EN*IS0*4757 94 = 3404589 0084906 69“ Page 2 EN IS0 4757 : 1994 Foreword This European Standard has been taken over by the Technical Committee CEN/TC 185, Threaded and non-threaded mechanical fasteners and accessories, from the work of ISO/TC 2, Fastener
16、s, of the International Organization for Standardization (ISO). This European Standard shaii be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 1995, and conflicting national standards shall be withdrawn at the latest by
17、 January 1995. According to the CENKENELEC Internal 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, United
18、 Kingdom. I_- CEN EN*IS0*4757 94 = 3909589 0084907 52b = Page 3 EN IS0 4757 : 1994 Cross recesses for screws 1 This International Standard defines two types of cross recesses for screws : Scope and field of application - recess type H; - recess type Z. Included in this International Standard is a me
19、thod of penetration gauging for both types. 2 Recess type H 2.1 Dimensions _ CEN EN*IS0*4757 94 m 3404589 0084908 462 = g O + 0.05 f r nom. Page 4 EN IS0 4757 : 1994 0.81 1,27 2.29 3.81 5,08 0,31 - O,% 0,51 - 0.56 0,66 - 0.74 0,79 - 0,86 1.19 - 1.27 03 03 0.6 03 1 Il ref. O O - 15 + 15 a I-b - n nq
20、1 0,61 I 0.97 I 1,47 I 2.41 I rn O OZ 03 0.61 1 ,o1 1,35 1) 1380 140 146O 153O 70 7O 5O 45 50 45 7O I. I 0,26 - 0.36 I 0,41 - 0,46 I 0,79- O, Fax: 0181 996 7001. In response to ordem for intemational standards, it is BSI policy to supply the BSI implementation of those that have been published as Br
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