SIST EN 14399-10:2009
(Main)High-strength structural bolting assemblies for preloading - Part 10: System HRC - Bolt and nut assemblies with calibrated preload
High-strength structural bolting assemblies for preloading - Part 10: System HRC - Bolt and nut assemblies with calibrated preload
This part of this European Standard specifies, together with EN 14399-1, the requirements for assemblies of high-strength structural bolts and nuts of system HRC suitable for preloaded joints, with hexagon head (large widths across flats) or cup head, thread sizes M12 to M30 and property class 10.9/10.
Bolt and nut assemblies to this part of this European Standard have been designed to allow preloading of at least 0,7 fub?As ) according to EN 1993-1-8 (Eurocode 3) and to obtain ductility predominantly by plastic elongation of the bolt. For this purpose the components have the following characteristics:
- nut according to EN 14399-3, or
- nut with height m = 1d,
- thread length of the bolt according to ISO 888.
Bolt and nut assemblies to this part of this European Standard include washer(s) according to EN 14399-6 or to EN 14399-5 (under the nut only).
NOTE Attention is drawn to the importance of ensuring that the bolts are correctly used if satisfactory result is to be obtained.
The test method for suitability for preloading is specified in EN 14399-2 and in Clause 8.
Hochfeste planmäßig vorspannbare Schraubenverbindungen für den Metallbau - Teil 10: System HRC - Garnituren aus Schrauben und Muttern mit kalibrierter Vorspannung
Der vorliegende Teil dieser Europäischen Norm legt gemeinsam mit EN 14399-1 die Anforderungen an
Garnituren aus hochfesten Schrauben und Muttern für den Metallbau des Systems HRC mit den Gewindegrößen
M12 bis M30 und der Festigkeitsklasse 10.9/10 fest, die für vorgespannte Verbindungen mit Sechskantkopf
(große Schlüsselweiten) oder Halbrundkopf geeignet sind.
Die Garnituren aus Schrauben und Muttern, die dem vorliegenden Teil dieser Europäischen Norm entsprechen,
wurden so gestaltet, dass sie ein Vorspannen auf mindestens 0,7 fub × As
1) in Übereinstimmung mit
EN 1993-1-8 (Eurocode 3) zulassen und dass sie ihr Verformungsvermögen vorwiegend durch plastische
Verlängerung der Schraube erreichen. Aus diesem Grund weisen die Komponenten die folgenden
Eigenschaften auf:
⎯ Mutter nach EN 14399-3 oder
⎯ Mutter mit der Höhe m = 1d,
⎯ Gewindelänge der Schraube nach ISO 888.
Garnituren aus Schrauben und Muttern, die dem vorliegenden Teil dieser Europäischen Norm entsprechen,
enthalten (eine) Scheibe(n) nach EN 14399-6 oder EN 14399-5 (nur unter der Mutter).
ANMERKUNG Es wird darauf hingewiesen, dass ein zufriedenstellendes Ergebnis nur dann erzielt wird, wenn sichergestellt
ist, dass die Schrauben sachgerecht eingesetzt werden. Für Empfehlungen zur ordnungsgemäßen Anwendung
siehe Anhang A.
Das Prüfverfahren für die Eignung zum Vorspannen ist in EN 14399-2 festgelegt und wird durch Abschnitt 5
ergänzt.
Boulonnerie de construction a haute résistance apte a la précontrainte - Partie 10 : Systeme HRC - Boulons (vis + écrou + rondelle) a précontrainte calibrée
La présente partie de cette Norme européenne spécifie, avec l’EN 14399-1, les exigences relatives aux
ensembles vis et écrous de construction à haute résistance du système HRC, à tête hexagonale (dimensions
des surplats de série large) ou cylindrique bombée, de diamètre de filetage M12 à M30 et de classe de
qualité 10.9/10 utilisables pour les assemblages précontraints.
Les boulons (vis + écrou + rondelle) conformes à la présente partie de cette Norme européenne ont été
conçus pour permettre une précontrainte d’au moins 0,7 fub × As
1 ) conformément à l’EN 1993-1-8:2005
(Eurocode 3) et pour obtenir une ductilité principalement par allongement plastique de la vis. A cet effet, les
éléments constitutifs ont les caractéristiques suivantes :
- écrou conformément à l’EN 14399-3, ou
- hauteur d’écrou m = 1 d,
- longueur de filetage de la vis conforme à l’ISO 888.
Les ensembles vis, écrou et rondelles conformes à la présente partie de cette Norme européenne incluent
une (des) rondelle(s) conforme(s) à l’EN 14399-6 ou à l’EN 14399-5 (sous l’écrou uniquement).
NOTE L’attention est attirée sur l’importance de s’assurer de l’utilisation correcte des boulons en vue d’obtenir des
résultats satisfaisants.
La méthode d’essai permettant de vérifier l’aptitude à l’emploi pour la mise en précontrainte est spécifiée dans
l'EN 14399-2 et dans l’Article 8.
Visokotrdnostne vijačne zveze za prednapetje - 10. del: Sistem HRC - Zveza vijaka in matice s kalibrirano prednapetostjo
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Hochfeste planmäßig vorspannbare Schraubenverbindungen für den Metallbau - Teil 10: System HRC - Garnituren aus Schrauben und Muttern mit kalibrierter VorspannungBoulonnerie de construction a haute résistance apte a la précontrainte - Partie 10 : Systeme HRC - Boulons (vis + écrou + rondelle) a précontrainte calibréeHigh-strength structural bolting assemblies for preloading - Part 10: System HRC - Bolt and nut assemblies with calibrated preload21.060.20MaticeNuts21.060.10Sorniki, vijaki, stebelni vijakiBolts, screws, studsICS:Ta slovenski standard je istoveten z:EN 14399-10:2009SIST EN 14399-10:2009en,fr,de01-junij-2009SIST EN 14399-10:2009SLOVENSKI
STANDARD
SIST EN 14399-10:2009
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14399-10March 2009ICS 21.060.01 English VersionHigh-strength structural bolting assemblies for preloading - Part10: System HRC - Bolt and nut assemblies with calibratedpreloadBoulonnerie de construction métallique à haute résistanceapte à la précontrainte - Partie 10: Système HRC - Boulons(vis + écrou + rondelle) à précontrainte calibréeHochfeste planmäßig vorspannbareSchraubenverbindungen für den Metallbau - Teil 10:System HRC - Garnituren aus Schrauben und Muttern mitkalibrierter VorspannungThis European Standard was approved by CEN on 24 January 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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 translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial 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, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14399-10:2009: ESIST EN 14399-10:2009
EN 14399-10:2009 (E) 2 Contents Page Foreword .4Introduction .51Scope .62Normative references .63Terms and definitions .74Bolts .74.1Dimensions of bolts .74.2Specification for bolts and reference standards . 124.3Marking of bolts . 125Nuts . 135.1Dimensions of nuts. 135.2Specification for nuts and reference standards . 155.3Proof load values of nuts . 155.4Decarburization of the nut thread . 165.5Marking of nuts . 166Designation of the bolt/nut assembly . 177Associated washers . 178Functional characteristics of the bolt/nut/washer assembly . 188.1General . 188.2Suitability test for preloading . 188.3Suitability test for calibrated preload . 188.4Requirements . 19Bibliography . 21
Figures Figure 1 — Bolt HRC with hexagon head . 8Figure 2 — Bolt HRC with cup head . 9Figure 3 — Examples for bolt marking . 13Figure 4 — Dimension of the nut . 14Figure 5 — Examples for nut marking . 17 SIST EN 14399-10:2009
EN 14399-10:2009 (E) 3 Tables Table 1 — Dimensions of hexagon bolts a . 9Table 2 — Dimensions of cup head bolts a b . 11Table 3 — Dimensions of spline-end a . 11Table 4 — Specifications for bolts and reference standards . 12Table 5 — Dimensions of nuts according to EN 14399-3:2005 (HR) a . 14Table 6 — Dimensions of nuts with height m = 1 d (HRD) a . 15Table 7 — Specifications for nuts and reference standards . 15Table 8 — Proof load values of nuts . 16Table 9 — Limiting values of bolt force at the fracture of the spline-end . 20 SIST EN 14399-10:2009
EN 14399-10:2009 (E) 4 Foreword This document (EN 14399-10:2009) 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 September 2009, and conflicting national standards shall be withdrawn at the latest by September 2011. 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. 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 test 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, Cyprus, Czech Republic, Denmark, 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. SIST EN 14399-10:2009
EN 14399-10:2009 (E) 5 Introduction This part of this European Standard completes the series of European standards EN 14399 parts 1 to 10 which specify high-strength structural bolting for preloading; it belongs to the system HR. The specificity of bolt and nut assemblies with a calibrated preload, compared with the system HR as defined in EN 14399-3, is the preload in the bolt which is controlled during tightening by the fracture of the spline-end of the bolt under torsional stress, this fracture occurring for a precise predetermined stress. 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 the coating of the assembly is under the control of the manufacturer. Besides the mechanical properties of the components, the functionality of the assembly requires that the specified preload can be achieved when the fracture of the break neck at the spline-end of the bolt occurs under the predetermined torsional stress when the assembly is tightened with the appropriate 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 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 is already common practice in Europe. SIST EN 14399-10:2009
EN 14399-10:2009 (E) 6 1 Scope This part of this European Standard specifies, together with EN 14399-1, the requirements for assemblies of high-strength structural bolts and nuts of system HRC suitable for preloaded joints, with hexagon head (large widths across flats) or cup head, thread sizes M12 to M30 and property class 10.9/10. Bolt and nut assemblies conforming to this part of this European Standard have been designed to allow preloading of at least 0,7 fub × As1) according to EN 1993-1-8:2005 (Eurocode 3) and to obtain ductility predominantly by plastic elongation of the bolt. For this purpose the components have the following characteristics: nut according to EN 14399-3, or nut with height m = 1 d, thread length of the bolt according to ISO 888. Bolt and nut assemblies conforming to this part of this European Standard include washer(s) according to EN 14399-6 or to EN 14399-5 (under the nut only). NOTE Attention is drawn to the importance of ensuring that the bolts are correctly used if a satisfactory result is to be obtained. The test method for suitability for preloading is specified in EN 14399-2 and in Clause 8. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 10045-1, Metallic materials – Charpy impact test – Part 1: Test method EN 14399-1, High-strength structural bolting assemblies for preloading – Part 1: General requirements EN 14399-2:2005, High-strength structural bolting assemblies for preloading – Part 2: Suitability test for preloading EN 14399-3:2005, High-strength structural bolting assemblies for preloading – Part 3: System HR – Hexagon bolt and nut assemblies 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 20898-2, Mechanical properties of fasteners – Part 2: Nuts with specified proof load values – Coarse thread (ISO 898-2:1992) EN 26157-1, Fasteners – Surface discontinuities – Part 1: Bolts, screws and studs for general requirements (ISO 6157-1:1988) EN ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel – Part 1: Bolts, screws and studs (ISO 898-1:1999)
1) fub is the nominal tensile strength (Rm) and As the stress area of the bolt. SIST EN 14399-10:2009
EN 14399-10:2009 (E) 7 EN ISO 3269, Fasteners – Acceptance inspection (ISO 3269:2000) EN ISO 4759-1, Tolerances for fasteners – Part 1: Bolts, screws, studs and nuts – Product grades A, B and C (ISO 4759-1:2000) EN ISO 6157-2, Fasteners – Surface discontinuities – Part 2: Nuts (ISO 6157-2:1995) EN ISO 10684, Fasteners – Hot dip galvanized coatings (ISO 10684:2004) ISO 148-1, Metallic materials – Charpy pendulum impact test – Part 1: Test method 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 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 shear wrench electric or manual tool equipped with two co-axial sockets which react by torque one against the other: the outer socket which engages the nut rotating clockwise; the inner socket which engages the spline-end of the bolt (i.e. bi-hexagonal) rotating anticlockwise NOTE The shear wrench operates as follows: − during the tightening operation of an assembly, the socket in rotation is the one that finds the least resistance to it; − from the outset and right up to the final tightening stage, the outer socket on the nut rotates clockwise while the inner socket holds the spline-end without rotating, the result being that the bolt assembly is progressively tightened by the increasing torque applied to the nut; − at the final stage of tightening, i.e. when the torsional resistance plateau of the break-neck section is attained, the inner socket rotates anticlockwise while the outer socket on the nut provides the reaction without rotating; − the bolt assembly installation is complete when the spline-end shears off at the break-neck section. 4
Bolts 4.1 Dimensions of bolts See Figures 1 and 2. Dimensions of bolts are in accordance with the relevant dimensions specified in
EN 14399-3:2005, see Tables 1 and 2. Dimensions of the spline-end are specified in Table 3. SIST EN 14399-10:2009
EN 14399-10:2009 (E) 8
Key a Incomplete thread u ≤ 2 P b 15° to 30° NOTE The difference between lg and ls should not be less than 1,5 P. Figure 1 — Bolt HRC with hexagon head SIST EN 14399-10:2009
EN 14399-10:2009 (E) 9
Key a Incomplete thread u ≤ 2 P NOTE The difference between lg and ls should not be l
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