High-strength structural bolting assemblies for preloading - Part 4: System HV - Hexagon bolt and nut assemblies

This document specifies together with EN 14399-1 the requirements for assemblies of high-strength structural bolts and nuts of system HV suitable for preloaded joints with large widths across flats, thread sizes M12 to M36 and property classes 10.9/10.
Bolt and nut assemblies to this document have been designed to allow preloading of at least 0,7 fub x As 1) according to EN 1993-1-1 (Eurocode 3) and to obtain ductility predominantly by plastic deformation of the engaged threads. For this purpose the components have the following characteristics:
-  nut height approximately 0,8 d
-  bolt with short thread length
Bolt and nut assemblies according to this document include washers according to EN 14399-6.
NOTE   Attention is drawn to the importance of ensuring that the bolts are correctly used if satisfactory result are to be obtained. For recommendations concerning proper application, reference to EN 1090-2 is made.
The requirements for suitability for preloading are specified in EN 14399-2.
Clamp lengths and grip lengths for the bolt/nut/washer assemblies are given in the normative Annex A.
----------------------------
1) fub is the nominal tensile strength (Rm) and As the stress area of the bolt.

Hochfeste vorspannbare Garnituren für Schraubverbindungen im Metallbau - Teil 4: System HV - Garnituren aus Sechskantschrauben und muttern

Dieses Dokument enthält, zusammen mit EN 14399-1, die Anforderungen für hochfeste Garnituren mit Sechs-kantschrauben und -muttern im Metallbau des Systems HV mit großer Schlüsselweite in den Abmessungen M12 bis M36 und den Festigkeitsklassen 10.9/10, die für vorspannbare Schraubverbindungen geeignet sind.
Die Garnituren aus Schrauben und Muttern, die diesem Dokument entsprechen, wurden so gestaltet, dass sie ein Vorspannen auf mindestens 0,7 fub  As ) in Übereinstimmung mit EN 1993-1-1 (Eurocode 3) erlauben, und dass sie ihr Verformungsvermögen vorwiegend durch plastische Verlängerung der Schraube erreichen. Zu diesem Zweck weisen die Komponenten folgende Merkmale auf:
   Mutterhöhe etwa 0,8 d,
   Schraube mit kurzem Gewinde.
Garnituren aus Schrauben und Muttern, die diesem Dokument entsprechen, beinhalten Scheiben nach EN 14399-6.
ANMERKUNG   Es wird darauf hingewiesen, dass zufrieden stellende Ergebnisse nur dann erzielt werden, wenn sicher¬gestellt ist, dass die Schrauben sachgerecht eingesetzt werden. Für Empfehlungen zur richtigen Anwendung wird auf EN 1090-2 verwiesen.
Die Anforderungen für die Eignung für das Vorspannen sind in EN 14399-2 festgelegt.
Klemmlängen und Paketdicken für Garnituren bestehend aus Schraube, Mutter und Scheibe(n) sind im normativen Anhang A angegeben.

Ensembles de boulonnerie de construction métallique à haute résistance apte à la précontrainte - Partie 4: Système HV - Boulons à tête hexagonale (vis + écrou)

Le présent document, avec l’EN 14399-1, spécifie les exigences applicables aux boulons de construction métallique à haute résistance du système HV (vis + écrou), à surplat de série large, de diamètre de filetage de M12 à M36 et de classes de qualité 10.9/10, destinés à être utilisés dans les assemblages précontraints.
Les boulons (vis + écrou) conformes au présent document ont été conçus de manière à permettre une précontrainte d’au moins 0,7 fub As ) conformément à l’EN 1993-1-1 (Eurocode 3) et à obtenir la ductilité principalement par déformation plastique du filetage en prise. Pour ce faire, les composants doivent avoir les caractéristiques suivantes :
   hauteur d’écrou d’environ 0,8 d ;
   vis de longueur filetée réduite.
Les boulons (vis + écrou) conformes au présent document comportent des rondelles conformes à
l’EN 14399-6.
NOTE   Il est important de s’assurer que les boulons sont utilisés de façon correcte afin d’obtenir un résultat satisfaisant. Pour les recommandations relatives à la bonne utilisation, se référer à l’EN 1090-2.
Les exigences relatives à l'aptitude à l'emploi pour la mise en précontrainte sont spécifiées dans
l’EN 14399-2.
Les longueurs de serrage des boulons (vis + écrou +rondelles(s)) et les épaisseurs serrées sont données dans l’Annexe A normative.

Visokotrdnostne strukturne vijačne zveze za prednapetje - 4. del: Sistem HV - Zveze vijakov s šestrobo glavo in šestrobo matico

Ta dokument skupaj s standardom EN 14399-1 določa zahteve za zveze visokotrdnostnih strukturnih vijakov in matic sistema HR, ki so primerne za prednapetja z velikimi širinami na ravninah, velikostmi navojev od M12 do M36 ter razredi trdnosti 8,8/8 in 10,9/10.
Zveze vijakov in matic v skladu s tem dokumentom so bile zasnovane za prednapetje vsaj 0,7 fub x As 1) v skladu s standardom EN 1993-1-1 (Evrokod 3) in ohranjanje razteznosti predvsem s plastično deformacijo navojev. Za ta namen imajo sestavni deli naslednje značilnosti:
– višino matice približno 0,8 d;
– vijak s kratko dolžino navoja.
Zveze vijakov in matic v skladu s tem dokumentom vključujejo podložke po standardu EN 14399-6.
OPOMBA: Opozoriti je treba na pomembnost zagotavljanja pravilne uporabe vijakov za dosego zadovoljivih rezultatov. Za priporočila glede pravilne uporabe je naveden standard EN 1090-2.
Zahteve za primernost za prednapetje so opredeljene v standardu EN 14399-2.
Dolžine objemk in dolžine oprijema za zveze vijakov/matic/podložk so podane v normativnem dodatku A.

General Information

Status
Published
Public Enquiry End Date
29-Sep-2014
Publication Date
23-Mar-2015
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
17-Mar-2015
Due Date
22-May-2015
Completion Date
24-Mar-2015

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Hochfeste vorspannbare Garnituren für Schraubverbindungen im Metallbau - Teil 4: System HV - Garnituren aus Sechskantschrauben und
mutternEnsembles de boulonnerie de construction métallique à haute résistance apte à la précontrainte - Partie 4: Système HV - Boulons à tête hexagonale (vis + écrou)High-strength structural bolting assemblies for preloading - Part 4: System HV - Hexagon bolt and nut assemblies21.060.20MaticeNuts21.060.10Sorniki, vijaki, stebelni vijakiBolts, screws, studsICS:Ta slovenski standard je istoveten z:EN 14399-4:2015SIST EN 14399-4:2015en,fr,de01-maj-2015SIST EN 14399-4:2015SLOVENSKI
STANDARDSIST EN 14399-4:20051DGRPHãþD



SIST EN 14399-4:2015



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14399-4
February 2015 ICS 21.060.01 Supersedes EN 14399-4:2005English Version
High-strength structural bolting assemblies for preloading - Part 4: System HV - Hexagon bolt and nut assemblies
Boulonnerie de construction métallique à haute résistance apte à la précontrainte - Partie 4: Système HV - Boulons à tête hexagonale (vis + écrou)
Hochfeste vorspannbare Garnituren für Schraubverbindungen im Metallbau - Teil 4: System HV - Garnituren aus Sechskantschrauben und -muttern This European Standard was approved by CEN on 18 October 2014.
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 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 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, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14399-4:2015 ESIST EN 14399-4:2015



EN 14399-4:2015 (E) 2 Contents Page Foreword .3 Introduction .4 1 Scope .6 2 Normative references .6 3 Bolts .7 3.1 Dimensions of bolts.7 3.2 Specifications for bolts and reference standards . 10 3.3 Marking of bolts . 10 4 Nuts . 11 4.1 Dimensions of nuts. 11 4.2 Specification for nuts and reference standards . 13 4.3 Decarburization of the nut thread . 13 4.4 Marking of nuts . 13 5 Designation of the bolt/nut assemblies . 14 6 Associated washers . 14 7 Functional characteristics of the bolt/nut/washers assembly . 14 7.1 General . 14 7.2 Maximum individual value of the bolt force during fitness for purpose test (Fbi,max) . 15 7.3 Values of angle û1 . 15 7.4 Values of angle û2 . 15 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) . 16 7.5.1 Individual values of the k-factor (ki) for k-class K1 . 16 7.5.2 Mean value of the k-factor (km) and coefficient of variation of the k-factor (Vk) for k-class K2 . 16 Annex A (normative)
Clamp lengths and Grip lengths . 17 Bibliography . 20
SIST EN 14399-4:2015



EN 14399-4:2015 (E) 3 Foreword This document (EN 14399-4:2015) has been prepared by Technical Committee CEN/TC 185 “Fasteners”, the secretariat 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 by endorsement, at the latest by August 2015 and conflicting national standards shall be withdrawn at the latest by November 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 14399-4:2005. In comparison with EN 14399-4:2005, the following modifications have been made: — Table 1 containing the overview of the composition of bolting assemblies and component marking has been added; — the use of washers in accordance with EN 14399-5 was deleted; — the coefficient of variation of the k-factor, Vk, has changed from 0,10 to 0,06; — specifications for the designation of the bolting assemblies have been revised; — in Annex A detailed specifications on grip lengths has been added. EN 14399 consists of the following parts, under the general title High-strength structural bolting assemblies for preloading: — 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: System 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 countries 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, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 14399-4:2015



EN 14399-4:2015 (E) 4 Introduction This document on structural bolting reflects the situation in Europe where two technical solutions exist to achieve the necessary ductility of bolt/nut/washers assemblies. These solutions consist of two different systems (HR and HV) of bolt/nut/washer assemblies, see Table 1. Both systems are well proven and it is the responsibility of the experts using 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 standardized in one single part of this European Standard each and the marking of the components of the same system is uniform. Preloaded bolted assemblies 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. For the same reason it is important that coating of 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 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. 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 compressive 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 eccentrically 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 motivated by economics but it should also be pointed out that the width across flats of 32 mm was already common practice in Europe. SIST EN 14399-4:2015



EN 14399-4:2015 (E) 5 Table 1 — Composition of high-strength structural bolting assemblies and component marking Type of bolting assembly System HR System HV System HRC General requirements EN 14399-1 Suitability for preloading EN 14399-2 and, if any, additional testing specified in the product standard Bolt and nut EN 14399-3 EN 14399-7 EN 14399-4 EN 14399-8 EN 14399-10 Marking Bolt HR8.8 HR10.9 HR8.8 HR10.9 HV10.9 HVP10.9 HRC10.9 Nut HR8 or HR10 HR10 HR8 or HR10 HR10 HV10 HV10 HR10 HRD10 Washers EN 14399-5a or EN 14399-6 EN 14399-6 EN 14399-5a or EN 14399-6 Marking H or HRb H or HVb H or HRb H or HRb or HDc Direct tension indicator and nut face washer or bolt face washer, if any EN 14399-9 Not applicable Marking Direct tension indicator H8 H10 H8 H10 H10 Nut face washer HN HN Bolt face washer HB Not applicable HB a EN 14399-5 can only be used under the nut. b At the choice of the manufacturer. c Mandatory mark for washers with enlarged outer diameter according to EN 14399-5 only. SIST EN 14399-4:2015



EN 14399-4:2015 (E) 6 1 Scope This European Standard specifies together with EN 14399-1 and EN 14399-2, the requirements for assemblies of high-strength structural bolts and nuts of system HV suitable for preloaded joints with large widths across flats, thread sizes M12 to M36 and property classes 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 1993-1-8 (Eurocode 3) and to obtain ductility predominantly by plastic deformation of the engaged threads. For this purpose the components have the following characteristics: — nut height approximately 0,8 d; — bolt with short thread length. Bolting assemblies in accordance with this document include washers according to EN 14399-6. NOTE Attention is drawn to the importance of ensuring that the bolting assemblies are correctly used if satisfactory results are to be obtained. For recommendations concerning proper application, reference to EN 1090-2 is made. General 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 document 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 requirements 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: Plain chamfered washers EN 26157-1, Fasteners - Surface discontinuities - Part 1: Bolts, screws and studs for general requirements (ISO 6157-1) EN ISO 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 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) EN ISO 6157-2, Fasteners - Surface discontinuities - Part 2: Nuts (ISO 6157-2)
1) fub is the nominal tensile strength (Rm) and As the nominal stress area of the bolt. SIST EN 14399-4:2015



EN 14399-4:2015 (E) 7 EN ISO 10684, Fasteners - Hot dip galvanized coatings (ISO 10684) ISO 261, ISO general purpose metric screw threads - General plan ISO 965-2, 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 galvanized external screw threads with maximum size of tolerance position h before galvanizing 3 Bolts 3.1 Dimensions of bolts See Figure 1 and Table 2.
Key a incomplete thread u ≤ 2P b 15° to 30° Figure 1 — Dimensions of bolts The difference between lg and ls should not be less than 1,5 P. For coated bolts, the dimensions apply prior to coating. SIST EN 14399-4:2015



EN 14399-4:2015 (E) 8 Table 2 — Dimensions of bolts Dimensions in millimetres Thread (d) M12 M16 M20 M22 M24 M27 M30 M36 Pa
1,75 2 2,5 2,5 3 3 3,5 4 b (ref).
23 28 33 34 39 41 44 52 c min. 0,4 0,4 0,4 0,4 0,4 0,4 0,4 0,4 max. 0,6 0,6 0,8 0,8 0,8 0,8 0,8 0,8 da max. 15,2 19,2 24,0 26,0 28,0 32,0 35,0 41,0 ds nom. 12 16 20 22 24 27 30 36 min. 11,30 15,30 19,16 21,16 23,16 26,16 29,16 35,00 max. 12,70 16,70 20,84 22,84 24,84 27,84 30,84 37,00 dw min. 20,1 24,9 29,5 33,3 38,0 42,8 46,6 55,9 max. b b b b b b b b e min. 23,91 29,56 35,03 39,55 45,20 50,85 55,37 66,44 k nom. 8 10 13 14 15 17 19 23 min. 7,55 9,25 12,10 13,10 14,10 16,10 17,95 21,95 max. 8,45 10,75 13,90 14,90 15,90 17,90 20,05 24,05 kw min. 5,28 6,47 8,47 9,17 9,87 11,27 1
...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Hochfeste vorspannbare Garnituren für Schraubverbindungen im Metallbau - Teil 4: System HV - Garnituren aus Sechskantschrauben und
mutternEnsembles de boulonnerie de construction métallique à haute résistance apte à la précontrainte - Partie 4: Système HV - Boulons à tête hexagonale (vis + écrou)High-strength structural bolting assemblies for preloading - Part 4: System HV - Hexagon bolt and nut assemblies21.060.01Vezni elementi na splošnoFasteners in generalICS:Ta slovenski standard je istoveten z:FprEN 14399-4kSIST FprEN 14399-4:2014en,fr,de01-september-2014kSIST FprEN 14399-4:2014SLOVENSKI
STANDARD



kSIST FprEN 14399-4:2014



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
DRAFT prEN 14399-4
May 2013 ICS 21.060.01 Will supersede EN 14399-4:2005English Version
High-strength structural bolting assemblies for preloading - Part 4: System HV - Hexagon bolt and nut assemblies
Boulonnerie de construction métallique à haute résistance apte à la précontrainte - Partie 4: Systéme HV - Boulons à tête hexagonale (vis + écrou)
Hochfeste vorspannbare Garnituren für Schraubverbindungen im Metallbau - Teil 4: System HV - Garnituren aus Sechskantschrauben und
muttern This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 185.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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 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, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. prEN 14399-4:2013: EkSIST FprEN 14399-4:2014



prEN 14399-4:2013 (E) 2 Contents Page Foreword .3 Introduction .4 1 Scope .6 2 Normative references .6 3 Bolts .8 3.1 Dimensions of bolts.8 3.2 Specifications for bolts and reference standards . 11 3.3 Underhead radius . 11 3.4 Marking of bolts . 11 4 Nuts . 12 4.1 Dimensions of nuts. 12 4.2 Specification for nuts and reference standards . 13 4.3 Decarburisation of the nut thread . 14 4.4 Marking of nuts . 14 5 Designation of the bolt/nut assembly . 14 6 Associated washers . 15 7 Functional characteristics of the bolt/nut/washer(s) assembly . 15 7.1 General . 15 7.2 Maximum individual value of the bolt force during tightening test (Fbi,max) . 15 7.3 Angle by which the nut (or bolt) has to be turned starting from a preload of 0,7 fub × As until Fbi,max is reached (∆Θ1) . 15 7.4 Angle by which the nut (or bolt) has to be turned starting from a preload of 0,7 fub × As until Fbi has dropped again to 0,7 fub × As (∆Θ2) . 16 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) . 16 7.5.1 Individual values of the k-factor (ki) for K-class K1 . 16 7.5.2 Mean value of the k-factor (km) and coefficient of variation of the k-factor (Vk) for K-class K2 . 16 Annex A (normative)
Clamp lengths and Grip lengths . 18 Bibliography . 21
kSIST FprEN 14399-4:2014



prEN 14399-4:2013 (E) 3 Foreword This document (prEN 14399-4:2013) has been prepared by Technical Committee CEN/TC 185 “Fasteners”, the secretariat of which is held by DIN. This document is currently submitted to the CEN Enquiry. This document will supersede EN 14399-4:2005. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). EN 14399 consists of the following parts, under the general title High-strength structural bolting assemblies for preloading:  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: System 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.
kSIST FprEN 14399-4:2014



prEN 14399-4:2013 (E) 4 Introduction This document on structural bolting reflects the situation in Europe where two technical solutions exist to achieve the necessary ductility of bolt/nut/washer assemblies. These solutions utilise different systems (HR and HV) of bolt/nut/washer assemblies, see Table 1. Both 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 standardised in one single part of this European Standard each and the marking of the components of the same system is uniform. Preloaded bolted assemblies are very sensitive to differences in manufacture and 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 coating of the assembly is under the control of one manufacturer. Beside the mechanical properties of the components, the functionality of the assembly requires that the specified preload 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 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 compressive 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 motivated by economics but it should also be pointed out that the width across flats of 32 mm is already common practice in Europe.
kSIST FprEN 14399-4:2014



prEN 14399-4:2013 (E) 5 Table 1 — Composition of high-strength structural bolting assemblies and component marking Type of bolting assembly System HR System HV System HRC General requirements EN 14399-1 Suitability for preloading EN 14399-2 and, if any, additional testing specified in the product standard Bolt and nut EN 14399-3 EN 14399-7 EN 14399-4 EN 14399-8 EN 14399-10 Marking Bolt HR8.8 HR10.9 HR8.8 HR10.9 HV10.9 HVP10.9 HRC10.9 Nut HR8 or HR10 HR10 HR8 or HR10 HR10 HV10 HV10 HR10 HRD10 Washer(s) EN 14399-5 or EN 14399-6 EN 14399-6 EN 14399-5 or EN 14399-6 Marking H or HRa H or HVa H or HRa H or HRa or HD Direct tension indicator and nut face washers or bolt face washers, if any EN 14399-9 Not applicable Marking Direct tension indicator H8 H10 H8 H10 H10 Nut face washer HN HN Bolt face washer HB Not applicable HB a At the choice of the manufacturer.
kSIST FprEN 14399-4:2014



prEN 14399-4:2013 (E) 6 1 Scope This document specifies together with EN 14399-1 the requirements for assemblies of high-strength structural bolts and nuts of system HV suitable for preloaded joints with large widths across flats, thread sizes M12 to M36 and property classes 10.9/10. Bolt and nut assemblies to this document have been designed to allow preloading of at least 0,7 fub×As1) according to EN 1993-1-1 (Eurocode 3) and to obtain ductility predominantly by plastic deformation of the engaged threads. For this purpose the components have the following characteristics:  nut height approximately 0,8 d  bolt with short thread length Bolt and nut assemblies according to this document include washers according to EN 14399-6. NOTE Attention is drawn to the importance of ensuring that the bolts are correctly used if satisfactory result are to be obtained. For recommendations concerning proper application, reference to EN 1090-2 is made. The requirements for suitability for preloading are specified in EN 14399-2. Clamp lengths and grip lengths for the bolt/nut/washer assemblies are given in the normative Annex A. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document 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 requirements. EN 14399-2, High-strength structural bolting assemblies for preloading — Part 2: Suitability for preloading EN 14399-6, High-strength structural bolting assemblies for preloading — Part 6: Plain chamfered washers EN 14399-7, High-strength structural bolting assemblies for preloading — Part 7: System HR — Countersunk head bolt and nut assemblies EN 14399-8, High-strength structural bolting assemblies for preloading — Part 8: System HV — Hexagon fit bolt and nut assemblies 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 14399-10, High-strength structural bolting assemblies for preloading — Part 10: System HRC — Bolt and nut assemblies with calibrated preload EN 26157-1, Fasteners — Surface discontinuities — Part 1: Bolts, screws and studs for general requirements EN ISO 148-1, Metallic materials — Charpy pendulum impact test — Part 1: Test method EN ISO 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
1) fub is the nominal tensile strength (Rm) and As the stress area of the bolt. kSIST FprEN 14399-4:2014



prEN 14399-4:2013 (E) 7 EN ISO 898-2, Mechanical properties of fasteners — Part 2: Nuts with specified proof load values — Coarse thread and fine pitch thread EN ISO 3269, Fasteners — Acceptance inspection EN ISO 4759-1, Tolerances for fasteners — Part 1: Bolts, screws, studs and nuts — Product grades A, B and C EN ISO 10684, Fasteners — Hot dip galvanized coatings ISO 261, ISO general-purpose metric screw threads — General plan ISO 965-2, 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 galvanized external screw threads with maximum size of tolerance position h before galvanizing kSIST FprEN 14399-4:2014



prEN 14399-4:2013 (E) 8 3 Bolts 3.1 Dimensions of bolts See Figure 1 and Table 2.
Key NOTE The difference between lg and ls should not be less than 1,5 P. a Incomplete thread u ≤ 2P b 15° to 30° Figure 1 — Dimensions of bolts kSIST FprEN 14399-4:2014



prEN 14399-4:2013 (E) 9 Table 2 — Dimensions of boltsa Dimensions in millimetres Thread (d) M12 M16 M20 M22 M24 M27 M30 M36 Pb
1,75 2 2,5 2,5 3 3 3,5 4 b (ref).
23 28 33 34 39 41 44 52 c min. 0,4 0,4 0,4 0,4 0,4 0,4 0,4 0,4 max. 0,6 0,6 0,8 0,8 0,8 0,8 0,8 0,8 da max. 15,2 19,2 24 26 28 32 35 41 ds nom. 12 16 20 22 24 27 30 36 min. 11,3 15,3 19,16 21,16 23,16 26,16 29,16 35 max. 12,7 16,7 20,84 22,84 24,84 27,84 30,84 37 dw min. 20,1 24,9 29,5 33,3 38,0 42,8 46,6 55,9 max. c c c c c c c c e min. 23,91 29,56 35,03 39,55 45,20 50,85 55,37 66,44 k nom. 8 10 13 14 15 17 19 23 min. 7,55 9,25 12,1 13,1 14,1 16,1 17,95 21,95 max. 8,45 10,75 13,9 14,9 15,9 17,9 20,05 24,05 kw min. 5,28 6,47 8,47 9,17 9,87 11,27 12,56 15,36 r min. 1,2 1,2 1,5 1,5 1,5 2 2 2 s max. 22 27 32 36 41 46 50 60 min. 21,16 26,16 31 35 40 45 49 58,8 l ls and lgd ls lg ls lg ls lg ls lg ls lg ls lg ls lg ls lg nom. min. max. min. max. min. max. min. max. min. max. min. max. min. max. min. max. min. max. 35 33,75 36,25 6,75 12
40 38,75 41,25 11,75 17 6 12
45 43,75 46,25 16,75 22 11 17 4,5 12
50 48,75 51,25 21,75 27 16 22
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