1、BSI Standards PublicationWB11885_BSI_StandardCovs_2013_AW.indd 1 15/05/2013 15:06High-strength structural bolting assemblies for preloadingPart 7: System HR Countersunk head bolt and nut assembliesBS EN 143997:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14399-7 July 2018 ICS 21.060.01 S
2、upersedes EN 14399-7:2007English Version High-strength structural bolting assemblies for preloading - Part 7: System HR - Countersunk head bolt and nut assemblies Boulonnerie de construction mtallique haute rsistance apte la prcontrainte - Partie 7 : Systme HR - Boulons tte fraise (vis + crou) Hochf
3、este vorspannbare Garnituren fr Schraubverbindungen im Metallbau - Teil 7: System HR - Garnituren aus Senkschrauben und Muttern This European Standard was approved by CEN on 15 October 2017. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
4、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 CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three
5、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 CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodie
6、s of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slove
7、nia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CEN All rights of exploitation in any form and by any means reser
8、ved worldwide for CEN national Members. Ref. No. EN 14399-7:2018 ENational forewordThis British Standard is the UK implementation of EN 143997:2018. It supersedes BS EN 143997:2007, which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee FME/9/2, Fasteners for
9、 structural bolting.A list of 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. The British Standards Institution 2018 Pub
10、lished by BSI Standards Limited 2018ISBN 978 0 580 92173 5ICS 21.060.01Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2018.Amendments/corrigenda issued
11、since publicationDate Text affectedBRITISH STANDARDBS EN 143997:2018EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 14399-7 July 2018 ICS 21.060.01 Supersedes EN 14399-7:2007English Version High-strength structural bolting assemblies for preloading - Part 7: System HR - Countersunk head bolt an
12、d nut assemblies Boulonnerie de construction mtallique haute rsistance apte la prcontrainte - Partie 7 : Systme HR - Boulons tte fraise (vis + crou) Hochfeste vorspannbare Garnituren fr Schraubverbindungen im Metallbau - Teil 7: System HR - Garnituren aus Senkschrauben und Muttern This European Stan
13、dard was approved by CEN on 15 October 2017. 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
14、 such national standards may be obtained on application to the CEN-CENELEC 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
15、 own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, German
16、y, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMI
17、TEE FR NORMUNG CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels 2018 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14399-7:2018 EBS EN 143997:2018EN 14399-7:2018 (E) 2 Contents Page European foreword . 3 Intro
18、duction 4 1 Scope 6 2 Normative references 6 3 Bolts . 7 3.1 Dimensions of bolts 7 3.2 Specification for bolts and reference standard . 11 3.3 Marking of bolts 11 4 Nuts . 12 4.1 Dimensions of nuts 12 4.2 Specification for nuts and reference standards 14 4.3 Proof load values of nuts . 15 4.4 Decarb
19、urisation of the nut thread . 15 4.5 Marking of nuts . 16 5 Designation of the bolt/nut assemblies . 16 6 Associated washers . 16 7 Functional characteristics of the bolt/nut/washer assembly . 17 7.1 General . 17 7.2 Maximum individual value of the bolt force during fitness for purpose test (Fbi max
20、) . 18 7.3 Values of angle 1. 18 7.4 Values of angle 2. 19 7.5 Individual values of the k-factor (ki), mean value of the k-factor (km) and coefficient of variation of the k-factor (Vk) . 19 7.5.1 Individual values of the k-factor (ki) for k-class K1 . 19 7.5.2 Mean value of the k-factor (km) and coe
21、fficient of variation of the k-factor (Vk) for k-class K2 19 Annex A (normative) Clamp lengths and grip lengths . 21 A.1 Clamp lengths for countersunk head bolting assemblies 21 A.2 Grip lengths for countersunk head bolting assemblies . 24 Bibliography . 27 BS EN 143997:2018EN 14399-7:2018 (E) 3 Eur
22、opean foreword This document (EN 14399-7:2018) has been prepared by Technical Committee CEN/TC 185 “Fasteners”, the secretariat of which is held by BSI. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the lates
23、t by January 2019 and conflicting national standards shall be withdrawn at the latest by January 2019. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN shall not be held responsible for identifying any or all such patent rights
24、. This document supersedes EN 14399-7:2007. In comparison with EN 14399-7:2007, the following modifications have been made: Table 1 containing the overview of the composition of bolting assemblies and component marking has been revised; the coefficient of variation of the k-factor, Vk, was changed f
25、rom 0,10 to 0,06; specifications for the designation of the bolting assemblies have been revised; Annex A with detailed specifications on clamp lengths and grip lengths has been added. EN 14399 consists of the following parts, under the general title High-strength structural bolting assemblies for p
26、reloading: Part 1: General requirements Part 2: Suitability for preloading Part 3: System HR Hexagon bolt and nut assemblies Part 4: System HV Hexagon bolt and nut assemblies Part 5: Plain washers Part 6: Plain chamfered washers Part 7: System HR Countersunk head bolt and nut assemblies Part 8: Syst
27、em HV Hexagon fit bolt and nut assemblies Part 9: System HR or HV Direct tension indicators for bolt and nut assemblies Part 10: System HRC Bolt and nut assemblies with calibrated preload According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countri
28、es are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Polan
29、d, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 143997:2018EN 14399-7:2018 (E) 4 Introduction This document on structural bolting reflects the situation in Europe where two technical solutions exist to achieve the necessary ductility
30、 of bolt/nut/washer(s) assemblies. These solutions consist of two different types (HR and HV) of bolt/nut/washer assemblies, see Table 1. Both types are well proven and it is the responsibility of the experts using structural bolting whether they use the one or the other type. It is, however, import
31、ant for the performance of the assembly to avoid mixing up the components of both types. Therefore, bolts and nuts for both types are standardized in one single part of this draft European Standard each and the marking of the components of the bolting assemblies is uniform. Preloaded bolted assembli
32、es are very sensitive to differences in manufacture and lubrication. Therefore, it is important that the bolting assemblies are supplied by one manufacturer, who is always responsible for the functionality of the bolting assemblies as supplied. For the same reason it is important that the coating of
33、 the bolting assemblies is under the control of one manufacturer. Beside the mechanical properties of the components, the functionality of the bolting assemblies requires that the specified preload can be achieved if the bolting assemblies are tightened with a suitable procedure. For this purpose, a
34、 test method for the suitability of the bolting assemblies for preloading was created, which will demonstrate whether the functionality of the bolting assemblies is fulfilled. BS EN 143997:2018EN14399-7:2018(E)5Table1 Compositionofhigh-strengthstructuralboltingassembliesand componentmarkingTypeofbol
35、tingassemblySystemHRSystemHVSystemHRCGeneralrequirementsEN14399-1SuitabilityforpreloadingEN14399-2and, if any, additional testingspecifiedinthe productstandardBoltandnutEN14399-3EN14399-7EN14399-4EN14399-8EN14399-10Marking BoltHR8.8HR10.9HR8.8HR10.9HV10.9HVP10.9HRC10.9NutHR8orHR10HR10HR8orHR10HR10HV
36、10HV10HR10HRD10Washer(s)EN14399-5aorEN14399-6EN14399-6EN14399-5aorEN14399-6MarkingH orHRbH orHVbH orHRbH orHRborHDcDirecttensionindicatorandnutfacewasher or boltfacewasher, ifanyEN14399-9NotapplicableMarking DirecttensionindicatorH8H10H8H10H10NutfacewasherHNHNboltface washerHBNotapplicableHBaEN14399
37、-5can onlybeusedunderthenut.bAt thechoiceofthemanufacturer.cMandatorymarkforwasherswithenlargedouterdiameteraccordingtoEN14399-5only.BS EN 143997:2018EN 14399-7:2018 (E) 6 1 Scope This European Standard specifies, together with EN 14399-1 and EN 14399-2, the requirements for assemblies of high-stren
38、gth structural countersunk bolts and nuts of system HR suitable for preloaded joints with thread sizes M12 to M36 and property classes 8.8/8 or 8.8/10 and 10.9/10. Bolting assemblies in accordance with this document have been designed to allow preloading of at least 0,7 fub As1)according to EN 1993-
39、1-8 (Eurocode 3) and to obtain ductility predominantly by plastic elongation of the bolt. For this purpose the components have the following characteristics: regular nut height according to style 1, see EN ISO 4032; thread length of the bolt according to ISO 888. Bolting assemblies in accordance wit
40、h this document include washers according to EN 14399-6 or to EN 14399-5. NOTE Attention is drawn to the importance of ensuring that bolting assemblies are correctly used if satisfactory results are to be obtained. For recommendations concerning proper application, reference to EN 1090-2 is made. Ge
41、neral requirements and requirements for suitability for preloading are specified in EN 14399-2. Clamp lengths and grip lengths for the bolting assemblies are specified in the normative Annex A. 2 Normative references The following documents, in whole or in part, are normatively referenced in this do
42、cument and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 14399-1, High-strength structural bolting assemblies for preloading - Part 1: General r
43、equirements EN 14399-2, High-strength structural bolting assemblies for preloading - Part 2: Suitability for preloading EN 14399-5, High-strength structural bolting assemblies for preloading - Part 5: Plain washers EN 14399-6, High-strength structural bolting assemblies for preloading - Part 6: Plai
44、n chamfered washers EN 14399-9, High-strength structural bolting assemblies for preloading - Part 9: System HR or HV - Direct tension indicators for bolt and nut assemblies EN 26157-1, Fasteners - Surface discontinuities - Part 1: Bolts, screws and studs for general requirements (ISO 6157-1) EN ISO
45、898-1, Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1: Bolts, screws and studs with specified property classes - Coarse thread and fine pitch thread (ISO 898-1) EN ISO 898-2, Mechanical properties of fasteners made of carbon steel and alloy steel - Part 2: Nuts with
46、 specified property classes - Coarse thread and fine pitch thread (ISO 898-2) EN ISO 3269, Fasteners - Acceptance inspection (ISO 3269) EN ISO 4759-1, Tolerances for fasteners - Part 1: Bolts, screws, studs and nuts - Product grades A, B and C (ISO 4759-1) 1) fubis the nominal tensile strength (Rm)
47、and Asis the nominal stress area of the bolt. BS EN 143997:2018EN 14399-7:2018 (E) 7 EN ISO 6157-2, Fasteners - Surface discontinuities - Part 2: Nuts (ISO 6157-2) EN ISO 10684, Fasteners - Hot dip galvanized coatings (ISO 10684) ISO 261, ISO general purpose metric screw threads - General plan ISO 9
48、65-2, ISO general purpose metric screw threads - Tolerances - Part 2: Limits of sizes for general purpose external and internal screw threads - Medium quality ISO 965-5, ISO general purpose metric screw threads - Tolerances - Part 5: Limits of sizes for internal screw threads to mate with hot-dip ga
49、lvanized external screw threads with maximum size of tolerance position h before galvanizing ISO 3508, Thread run-outs for fasteners with thread in accordance with ISO 261 and ISO 262 3 Bolts 3.1 Dimensions of bolts See Figure 1 and Table 2. Key a incomplete thread u 2P Figure 1 Dimensions of bolts The difference between lgand lsshould not be less than 1,5 P. For coated bolts, the dimensions apply prior to coating. BS EN 143997:2018EN 14399-7:2018 (E) 8 Table 2 Dimensions of bo
