SIST EN 14399-9:2018
(Main)High-strength structural bolting assemblies for preloading - Part 9: System HR or HV - Direct tension indicators for bolt and nut assemblies
High-strength structural bolting assemblies for preloading - Part 9: System HR or HV - Direct tension indicators for bolt and nut assemblies
This draft European Standard specifies, together with EN 14399-1 and EN 14399-2, the requirements for compressible washer-type direct tension indicators, nut face washers and bolt face washers as part of high-strength structural bolting assemblies suitable for preloaded joints.
These direct tension indicators are specified as part of high-strength structural bolting assemblies of system HR or HV in accordance with EN 14399-3, EN 14399-4, EN 14399-7 or EN 14399-8, with nominal thread sizes M12 up to and including M36 and property classes 8.8/8 or 8.8/10 and 10.9/10.
It specifies two property designations H8 and H10 for direct tension indicators, together with general dimensions, tolerances, materials and performance.
Bolting assemblies in accordance with this document 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 system HR in accordance with EN 14399-3 or EN 14399-7, or by plastic deformation of the engaged threads for system HV in accordance with EN 14399-4 or EN 14399-8.
Bolting assemblies conforming to this document may include washer(s) according to EN 14399-6 or to EN 14399-5 (under the nut only).
NOTE 1 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 together with Clause 5 of this document.
NOTE 2 Compressible washer-type direct tension indicators are also known as load indicating washers.
Hochfeste vorspannbare Garnituren für Schraubverbindungen im Metallbau - Teil 9: System HR oder HV - Direkte Kraftanzeiger für Garnituren aus Schrauben und Muttern
Diesen Europäische Norm legt zusammen mit EN 14399-1 und EN 14399-2 die Anforderungen für verformbare, scheibenförmige, direkte Kraftanzeiger sowie mutter- und schraubenkopfseitige Scheiben als Bestandteil von Garnituren aus hochfesten Schrauben und Muttern für den Metallbau fest, die für vorspannbare Schraubverbindungen geeignet sind.
Diese direkten Kraftanzeiger werden als Bestandteil hochfester Schraubgarnituren im Metallbau der Systeme HR oder HV nach EN 14399-3, EN 14399-4, EN 14399-7 oder EN 14399-8 mit Gewindenenngrößen M12 bis einschließlich M36 und den Festigkeitsklassen 8.8/8, 8.8/10 und 10.9/10 festgelegt.
Dieses Dokument spezifiziert zusammen mit allgemeinen Maßen, Toleranzen, Werkstoffen und Leistungsmerkmalen die beiden Festigkeitsbezeichnungen H8 und H10 für direkte Kraftanzeiger.
Die Garnituren für Schraubverbindungen nach diesem Dokument wurden so gestaltet, dass sie ein Vorspannen auf mindestens 0,7 f_ub× A_s) nach EN 1993-1-8 (Eurocode 3) erlauben, und dass sie ihre Duktilität vorwiegend durch plastische Dehnung der Schraube im System HR nach EN 14399-3 oder EN 14399-7 oder durch plastische Verformung der eingeschraubten Gewinde im System HV nach EN 14399-4 oder EN 14399-8 erreichen.
Garnituren für Schraubverbindungen nach diesem Dokument dürfen Scheibe(n) nach EN 14399-6 oder EN 14399-5 (nur unter der Mutter) enthalten.
ANMERKUNG 1 Es wird darauf hingewiesen, dass zum Zwecke zufrieden¬stellender Ergebnisse sicherzustellen ist, dass die Garnituren für Schraubverbindungen sachgerecht eingesetzt werden. Für Empfehlungen zur richtigen Anwendung wird auf EN 1090-2 verwiesen.
Allgemeine Anforderungen und Anforderungen bezüglich der Eignung zur Vorspannung sind zusammen mit Abschnitt 5 des vorliegenden Dokuments in EN 14399-2 festgelegt.
ANMERKUNG 2 Verformbare, scheibenförmige, direkte Kraftanzeiger sind auch als lastanzeigende Scheiben bekannt.
Boulonnerie de construction métallique à haute résistance apte à la précontrainte - Partie 9 : Système HR ou HV - Boulons avec rondelles indicatrices de précontrainte
Le présent projet de Norme européenne spécifie, avec l’EN 14399-1 et l’EN 14399-2, les exigences relatives aux rondelles indicatrices de précontrainte compressibles, aux rondelles côté tête de vis et aux rondelles côté écrou en tant que constituant de la boulonnerie de construction métallique apte à la précontrainte.
Ces rondelles indicatrices de précontrainte sont spécifiées comme faisant partie d’un boulon de construction métallique de système HR ou HV, conformément à l’EN 14399-3, l’EN 14399-4, l’EN 14399-7 ou l’EN 14399-8, pour les diamètres de filetage nominaux M12 à M36 inclus et les classes de qualité 8.8/8, 8.8/10 et 10.9/10.
Il spécifie deux désignations caractéristiques H8 et H10 pour les rondelles indicatrices de précontrainte, ainsi que les dimensions générales, tolérances, matériaux et caractéristiques fonctionnelles.
Les boulons conformes au présent document ont été conçus pour permettre une précontrainte d'au moins 0,7 fub × As) conformément à l’EN 1993-1-8 (Eurocode 3) et pour obtenir la ductilité principalement par allongement plastique de la vis du système HR conformément à l’EN 14399-3ou à l’EN 14399-7, la déformation plastique des filets en prise du système HV conformément à l’EN 14399-4 ou à l’EN 14399-8.
Les boulons conformes au présent document peuvent inclure une ou plusieurs rondelles conformes à l’EN 14399-6, ou à l’EN 14399-5 (sous l’écrou uniquement).
NOTE 1 L’attention est attirée sur l’importance de veiller à ce que les boulons soient correctement utilisés si des résultats satisfaisants doivent être obtenus. Pour des recommandations relatives à une application adéquate, référence à la norme EN 1090-2 est faite.
Les exigences générales et les exigences pour l’aptitude à l’emploi sont spécifiées dans l’EN 14399-2 ainsi que dans l’Article 5 du présent document.
NOTE 2 Les rondelles indicatrices de précontrainte compressibles sont également appelées rondelles indicatrices de l’effort.
Visokotrdnostne vijačne zveze za prednapetje - 9. del: Sistem HR ali HV - Indikatorske podložke privitja za zveze vijakov in matic
Ta osnutek evropskega standarda določa, skupaj s standardoma EN 14399-1 in EN 14399-2, zahteve za stisljive indikatorske podložke privitja, podložke na strani matice in podložke na strani vijaka, ki so del visokotrdnostnih vijačnih zvez, primernih za prednapetja.
Te indikatorske podložke privitja so določene kot del visokotrdnostnih vijačnih zvez sistema HR ali HV v skladu s standardom EN 14399-3, EN 14399-4, EN 14399-7 ali EN 14399-8, z nazivno velikostjo navora M12 do vključno M36 in razredi trdnosti 8,8/8 ali 8,8/10 in 10,9/10.
Določa dve oznaki lastnosti H8 in H10 za indikatorske podložke privitja, skupaj s splošnimi merami, tolerancami, materiali in delovanjem.
Vijačne zveze v skladu s tem dokumentom so bile zasnovane za prednapetje vsaj 0,7 fub × As v skladu s standardom EN 1993-1-8 (Evrokod 3) in ohranjanje razteznosti predvsem s plastičnim podaljšanjem vijaka za sistem HR v skladu s standardom EN 14399-3 ali EN 14399-7 oziroma s plastično deformacijo navojev za sistem HV v skladu s standardom EN 14399-4 ali EN 14399-8.
Vijačne zveze, ki so skladne s tem dokumentom, lahko vključujejo podložke v skladu s standardom EN 14399-6 ali EN 14399-5 (samo pod matico).
OPOMBA 1: Opozoriti je treba na pomembnost zagotavljanja pravilne uporabe vijačnih zvez za doseganje zadovoljivih rezultatov. Za priporočila glede pravilne uporabe je naveden standard EN 1090-2.
Splošne zahteve in zahteve za primernost za prednapetje so opredeljene v standardu EN 14399-2 in 5. točki tega dokumenta.
OPOMBA 2: Stisljive indikatorske podložke privitja so znane tudi kot indikatorji neposredne napetosti.
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Hochfeste vorspannbare Garnituren für Schraubverbindungen im Metallbau - Teil 9: System HR oder HV - Direkte Kraftanzeiger für Garnituren aus Schrauben und MutternBoulonnerie de construction métallique à haute résistance apte à la précontrainte - Partie 9 : Système HR ou HV - Boulons avec rondelles indicatrices de précontrainteHigh-strength structural bolting assemblies for preloading - Part 9: System HR or HV - Direct tension indicators for bolt and nut assemblies21.060.20MaticeNuts21.060.10Sorniki, vijaki, stebelni vijakiBolts, screws, studsICS:Ta slovenski standard je istoveten z:EN 14399-9:2018SIST EN 14399-9:2018en,fr,de01-julij-2018SIST EN 14399-9:2018SLOVENSKI
STANDARDSIST EN 14399-9:20091DGRPHãþD
SIST EN 14399-9:2018
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14399-9
May
t r s z ICS
t sä r x rä r s Supersedes EN
s v u { {æ {ã t r r {English Version
Highæstrength structural bolting assemblies for preloading æ Part
{ã System HR or HV æ Direct tension indicators for bolt and nut assemblies Boulonnerie de construction métallique à haute résistance apte à la précontrainte æ Partie
{ ã Système HR ou HV æ Boulons avec rondelles indicatrices de précontrainte
Hochfeste vorspannbare Garnituren für Schraubverbindungen im Metallbau æ Teil
{ã System HR oder HV æ Direkte Kraftanzeiger für Garnituren aus Schrauben und Muttern This European Standard was approved by CEN on
t t October
t r s yä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä
CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä
EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Rue de la Science 23,
B-1040 Brussels
9
t r s z CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN
s v u { {æ {ã t r s z ESIST EN 14399-9:2018
EN 14399-9:2018 (E) 2 Contents Page European foreword . 3 Introduction . 5 1 Scope . 7 2 Normative references . 7 3 Direct tension indicators . 8 3.1 General . 8 3.2 Dimensions . 8 3.3 Specifications and reference standards for direct tension indicators. 10 3.4 Functional test of direct tension indicators . 11 3.5 Test method for measuring compression loads (all finishes) on direct tension indicators . 12 3.5.1 General . 12 3.5.2 Testing apparatus . 12 3.5.3 Support blocks . 13 3.5.4 Bearing blocks . 14 3.5.5 Calibration . 14 3.5.6 Test procedure . 14 3.6 Marking of the direct tension indicator . 17 3.7 Designation of the direct tension indicator . 17 4 Nut face washers (HN) and bolt face washers (HB) . 17 4.1 Dimensions . 17 4.2 Specifications and reference standards for nut face washers (HN) and bolt face washers (HB) . 19 4.3 Marking . 20 4.3.1 Nut face washers (HN) . 20 4.3.2 Bolt face washers (HB) . 20 4.4 Designation of nut face washers (HN) and bolt face washers (HB) . 21 5 Functional characteristics . 21 5.1 Bolting assemblies . 21 5.2 Functional characteristics of direct tension indicators in the assembly . 22 5.3 Functional characteristics of bolting assemblies with direct tension indicator . 23 5.3.1 General . 23 5.3.2 Suitability test procedures . 23 Annex A (informative)
Use of structural bolting assemblies for preloading with direct tension indicators . 25 A.1 General . 25 A.2 Bolting assembly configurations . 25 A.3 Checking . 26 Bibliography . 29
SIST EN 14399-9:2018
EN 14399-9:2018 (E) 3 European foreword This document (EN 14399-9:2018) 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 latest by November 2018 and conflicting national standards shall be withdrawn at the latest by November 2018. 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 14399-9:2009. In comparison with EN 14399-9:2009, the following modifications have been made: — Table 1 containing the overview of the composition of bolting assemblies and component marking has been revised; — the test method for measuring compression loads on direct tension indicators has been revised; — the suitability test for bolting assemblies including direct tension indicators has been revised; — Informative Annex A has been deleted; — Informative Annex on the use of direct tension indicators 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 SIST EN 14399-9:2018
EN 14399-9:2018 (E) 4 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, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. SIST EN 14399-9:2018
EN 14399-9:2018 (E) 5 Introduction This document is part of the EN 14399 series which specify high-strength structural bolting for preloading; this part belongs to both types, HR and HV. Direct tension indicators (known formerly as load indicating washers) used in conjunction with nut face washers (HN) and bolt face washers (HB) are load indicating devices which are placed under the bolt head or under the nut. The direct tension indicators have protrusions on one face which compress under load and thus may be used to indicate that at least the required preload has been achieved in the bolting assembly. Direct tension indicators are only to be sold as components of structural bolting assemblies comprised of bolts, nuts and associated washers that otherwise complies with EN 14399-3, EN 14399 «4, EN 14399 «7 or EN 14399 «8. The composition of bolt/nut/washer/direct tension indicator assemblies is shown in Table 1. 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 as supplied. For the same reason it is important that the 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 when the gap remaining after tightening (compressed protrusions) is less than the specified values in this standard, if the assembly is tightened with a suitable procedure. For this purpose the test method given in this standard was developed, which demonstrates whether the functionality of the bolting assemblies is fulfilled. SIST EN 14399-9:2018
EN 14399-9:2018 (E) 6 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 a or EN 14399-6 EN 14399-6 EN 14399-5 a or EN 14399-6 Marking H or HR b H or HV b H or HR b H or HR b or HD c 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 14399-9:2018
EN 14399-9:2018 (E) 7 1 Scope This document specifies, together with EN 14399-1 and EN 14399-2, the requirements for direct tension indicators, nut face washers (HN) and bolt face washers (HB) as part of high-strength structural bolting assemblies suitable for preloaded joints. These direct tension indicators are specified as part of high-strength structural bolting assemblies of system HR or HV in accordance with EN 14399-3, EN 14399-4, EN 14399-7 or EN 14399-8, with nominal thread sizes M12 up to and including M36 and property classes 8.8/8 or 8.8/10 and 10.9/10. It specifies two property designations H8 and H10 for direct tension indicators, together with general dimensions, tolerances, materials and functional property/ies. 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 elongation of the bolt for system HR in accordance with EN 14399-3 or EN 14399-7, or by plastic deformation of the engaged threads for system HV in accordance with EN 14399-4 or EN 14399-8. Bolting assemblies conforming to this document may include washer(s) according to EN 14399-6 or to EN 14399-5 (under the nut only). NOTE 1 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 together with Clause 5 of this document. NOTE 2 Direct tension indicators are also known as load indicating washers. 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 ISO 17668, Zinc diffusion coatings on ferrous products — Sherardizing — Specification (ISO 17668) 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 14399-3, High-strength structural bolting assemblies for preloading — Part 3: System HR — Hexagon bolt and nut assemblies EN 14399-4, High-strength structural bolting assemblies for preloading — Part 4: System HV — 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
1) fub is the nominal tensile strength (Rm) and As is the nominal stress area of the bolt. SIST EN 14399-9:2018
EN 14399-9:2018 (E) 8 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 ISO 3269:2000, Fasteners — Acceptance inspection (ISO 3269:2000) EN ISO 4759-3, Tolerances for fasteners — Part 3: Washers for bolts, screws and nuts — Product grades A, C and F (ISO 4759-3) EN ISO 6507-1, Metallic materials — Vickers hardness test — Part 1: Test method (ISO 6507-1) EN ISO 6508-1, Metallic materials — Rockwell hardness test — Part 1: Test method (ISO 6508-1) EN ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1: Tension/compression testing machines — Calibration and verification of the force-measuring system (ISO 7500-1) 3 Direct tension indicators 3.1 General The purpose of direct tension indicators is to show that a defined preload is achieved in the bolting assemblies. The direct tension indicator shall be used as specified in 5.1, with or without nut face washers (HN), and with or without bolt face washers (HB). The direct tension indicators shall be qualified as components of bolting assemblies, in accordance with EN 14399-1. To comply with EN 14399-2 the bolting assemblies shall be supplied by one manufacturer, and shall include bolts, nuts, washers and direct tension indicators. Bolting assemblies may also include nut face washers (HN) and/or bolt face washers (HB), if required. 3.2 Dimensions Before installation, the dimensions and tolerances of direct tension indicators shall be as specified in Table 2 and Figure 1. The size and number of protrusions on the direct tension indicator shall be sufficient to meet the requirements of 3.4 and their number shall be not less than four. The protrusions on the direct tension indicator shall be spaced at equal angular intervals. The shape of the protrusions is at the choice of the manufacturer. SIST EN 14399-9:2018
EN 14399-9:2018 (E) 9
Key d1 internal diameter d2 external diameter d3 protrusion tangential external diameter d4 protrusion tangential internal diameter h1 material thickness (excluding protrusions) h2 height over protrusions (including protrusions) h3 height of protrusions Figure 1 — Dimensions of direct tension indicator (example with six protrusions) Figure 1 shows a schematic representation of the protrusions (other forms including curved may be used). For coated direct tension indicators, the dimensions apply prior to coating. Direct tension indicators may have indentations or other features on the outside diameter that correspond to and are aligned with feeler gauge entry spaces to indicate where feeler gauges shall be inserted. SIST EN 14399-9:2018
EN 14399-9:2018 (E) 10 Table 2 — Dimensions of direct tension indicators Dimensions in millimetres Nominal size d (nominal thread diameter of associated bolt) Internal diameter External diameter Material thickness (excluding protrusions) Height over protrusions (including protrusions) Height of protrusions Protrusion tangential external diameter Protrusion tangential internal diameter d1 d2 h1 h2 h3 d3 d4 min. max. min. max. min. max. min. max. min. M12 12,75 12,85 26,0 32,5 2,5 5,5 0,8 20,0 13,85 M16 16,75 16,85 35,0 36,8 3,0 6,0 0,8 25,0 17,85 M20 20,95 21,05 41,0 46,0 3,5 6,5 0,8 29,0 22,05 M22 23,05 23,15 46,5 50,6 4,0 7,0 0,8 33,0 24,15 M24 25,15 25,25 50,0 55,2 4,0 7,0 0,8 38,0 26,25 M27 28,30 28,40 54,0 62,1 4,0 7,0 0,8 43,0 29,40 M30 31,45 31,55 59,0 69,0 4,0 7,0 0,8 46,5 32,55 M36 37,75 37,85 78,0 83,0 4,0 7,5 0,8 56,0 38,85
3.3 Specifications and reference standards for direct tension indicators The specifications and reference standards are given in Table 3. SIST EN 14399-9:2018
EN 14399-9:2018 (E) 11 Table 3 — Specifications and reference standards for direct tension indicators Material Steel General requirements EN 14399–1 and EN 14399–2 Heat treatment hardened and tempered or controlled rolled and tempered Maximum hardness 380 HV Finish — Coating a Uncoated as processed c Sherardized b EN ISO 17668 Others to be agreed d Associated bolts and nuts EN 14399–3, EN 14399–4, EN 14399–7 or EN 14399–8 Associated washers EN 14399–5 or EN 14399–6 Acceptability For acceptance procedure, see EN ISO 3269:2000 e. a The direct tension indicators shall not be electroplated or subjected to any process that could result in hydrogen embrittlement. b Sherardizing is considered to provide corrosion protection equivalent to hot dip galvanizing. c “As processed” means the normal finish resulting from manufacture with a light oil coating. d Other coatings may be negotiated between the purchaser and the manufacturer providing they do not impair the mechanical properties or functional characteristics. Coatings of cadmium or cadmium alloys are not permitted. e For acceptance criteria use 0,65 AQL, Ac = 0; see EN ISO 3269:2000, Table 5 and Table 6.
3.4 Functional test of direct tension indicators The direct tension indicators shall be tested on a calibrated load-measuring device; see 3.5 for the test procedure. The load requirement of Table 4 shall be met when the direct tension indicators are compressed to the gap of 0,40 mm. Samples of direct tension indicators shall be tested by the manufacturer after the f
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