BS EN 14399-8-2007 High-strength structural bolting assemblies for preloading. System HV. Hexagon fit bolts and nut assemblies1.pdf
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1、BRITISH STANDARD BS EN 14399-8:2007 High-strength structural bolting assemblies for preloading Part 8: System HV Hexagon fit bolt and nut assemblies ICS 21.060.01 ? BS EN 14399-8:2007 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 January
2、 2008 BSI 2008 ISBN 978 0 580 54250 3 National foreword This British Standard is the UK implementation of EN 14399-8:2007. The UK participation in its preparation was entrusted by Technical Committee FME/9, Nuts, bolts and accessories/steering committee, to Subcommittee FME/9/1, Material. A list of
3、organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal ob
4、ligations. Amendments/corrigenda issued since publication DateComments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14399-8 December 2007 ICS 21.060.01 English Version High-strength structural bolting assemblies for preloading - Part 8: System HV - Hexagon fit bolt and nut assemblies Boulonn
5、erie de construction mtallique haute rsistance apte la prcontrainte - Partie 8: Systme HV - Boulons ajusts tte hexagonale (vis + crou) Hochfeste planmig vorspannbare Schraubenverbindungen fr den Metallbau - Teil 8: System HV - Garnituren aus Sechskant-Passschrauben und Muttern This European Standard
6、 was approved by CEN on 10 November 2007. CEN members are bound to comply with the CEN/CENELEC 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 su
7、ch national standards may be obtained on application to the CEN Management Centre or to any CEN 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 langua
8、ge and notified to the CEN Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Lux
9、embourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2007 CENAll r
10、ights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14399-8:2007: E EN 14399-8:2007 (E) 2 Contents Foreword3 Introduction.4 1Scope 5 2Normative references5 3Terms and definitions .6 4Fit bolts.6 5Nuts.12 6Designation of the fit bolt/nut assembl
11、y .14 7Associated washers 14 8Functional characteristics of the fit bolt/nut/washer(s) assembly.14 Bibliography17 Figures Figure 1 Dimensions of fit bolts7 Figure 2 Clamp length t.7 Figure 3 Example for marking of a bolt12 Figure 4 Dimensions of nuts 12 Figure 5 Example for marking of a nut.14 Table
12、s Table 1 Systems of bolt/nut/washer(s) assemblies4 Table 2 Dimensions of fit boltsa.8 Table 3 Clamp length ta10 Table 4 Specifications for bolts and reference standards11 Table 5 Dimensions of nutsa12 Table 6 Specifications for nuts and reference standards.13 Table 7 Values for 115 Table 8 Values f
13、or 215 ? EN 14399-8:2007 (E) 3 Foreword This document (EN 14399-8:2007) has been prepared by Technical Committee CEN/TC 185 “ Fasteners” , the se- cretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or
14、 by endorsement, at the latest by June 2008, and conflicting national standards shall be withdrawn at the latest by June 2010. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following coun- tries are bound to implement this European Standard: Austria,
15、Belgium, Bulgaria, Cyprus, Czech Republic, Den- mark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. ? EN 14399-8
16、:2007 (E) 4 Introduction This document for structural bolting reflects the situation in Europe where two technical solutions exist to achieve the necessary ductility of bolt/nut/washer assemblies. These solutions utilize different systems (HR and HV) of bolt/nut/washer assemblies, see Table 1. Both
17、systems are well proved and it is up to the experts responsible for structural bolting whether they use the one or the other system. It is however important for the performance of the assembly to avoid mixing up the components of both systems. Therefore bolts and nuts for both systems are standardiz
18、ed in one single part of this European Standard each and the marking of the components of the same system is uniform. Table 1 Systems of bolt/nut/washer(s) assemblies Bolt/nut/washer(s) assembly System HR Bolt/nut/washer(s) assembly System HV General requirements EN 14399-1 Bolt/nut assemblies EN 14
19、399-3, EN 14399-7 EN 14399-4, EN 14399-8 Marking HR HV Property classes 8.8/8 10.9/10 10.9/10 Washer(s) EN 14399-5 or EN 14399-6 EN 14399-5 or EN 14399-6 Marking H H Suitability test for preloading EN 14399-2 EN 14399-2 Preloaded bolted assemblies are very sensitive to differences in manufacture and
20、 lubrication. Therefore it is important that the assembly is supplied by one manufacturer who is always responsible for the function of the assembly. For the same reason it is important that the coating of the assembly is under the control of the manufacturer. Beside the mechanical properties of the
21、 components, the functionality of the assembly requires that the specified pre- load can be achieved if the assembly is tightened with a suitable procedure. For this purpose a test method for the suitability of the components for preloading was created which will demonstrate whether the function of
22、the assembly is fulfilled. It should be pointed out that compared to ISO 272 the widths across flats (large series) for M12 and M20 have been changed to 22 mm and 32 mm respectively. These changes are justified by the following reasons. Under the specific conditions of structural bolting the compres
23、sive stresses under the bolt head or nut for the sizes M12 may become too large with the width across flats of 21 mm, especially if the washer is fitted excentrically to the bolt axis. For the size M20 the width across flats of 34 mm is very difficult to be produced. The change to 32 mm is primarily
24、 motivated by economics but it should also be pointed out that the width across flats of 32 mm is already common practice in Europe. Attention is drawn to the importance of ensuring that the bolts are correctly used if satisfactory results are to be obtained. For recommendations concerning proper ap
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