SIST EN 14399-4:2005

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Hochfeste planmäßig vorspannbare Schraubenverbindungen für den Metallbau - Teil 4: System HV - Garnituren aus Sechskantschrauben und -mutternBoulonnerie de construction métallique a haute résistance apte a la précontrainte - Partie 4 : Systeme HV - Boulons a tete 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 14399-4:2005SIST EN 14399-4:2005en01-maj-2005SIST EN 14399-4:2005SLOVENSKI
STANDARD



SIST EN 14399-4:2005



EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 14399-4March 2005ICS 21.060.10; 21.060.20English versionHigh-strength structural bolting assemblies for preloading - Part4: System HV - Hexagon bolt and nut assembliesBoulonnerie de construction métallique à haute résistanceapte à la précontrainte - Partie 4 : Système HV - Boulons àtête hexagonale (vis + écrou)Hochfeste planmäßig vorspannbareSchraubenverbindungen für den Metallbau - Teil 4: SystemHV - Garnituren aus Sechskantschrauben und -mutternThis European Standard was approved by CEN on 30 April 2004.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 Central Secretariat 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 Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2005 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14399-4:2005: ESIST EN 14399-4:2005



EN 14399-4:2005 (E) 2 Contents page Foreword.3 Introduction.4 1 Scope.5 2 Normative references.5 3 Bolts.6 4 Nuts.10 5 Designation of the bolt/nut assembly.12 6 Associated washers.12 7 Functional characteristics of the bolt/nut/washer(s) assembly.12 Annex A (normative)
Clamp lengths.15 Bibliography.17
SIST EN 14399-4:2005



EN 14399-4:2005 (E) 3 Foreword This document (EN 14399-4:2005) has been prepared by Technical Committee CEN/TC 185 “Threaded and non-threaded mechanical fasteners and accessories”, 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 2005, and conflicting national standards shall be withdrawn at the latest by September 2005.
This document includes a Bibliography. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following coun-tries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Esto-nia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. SIST EN 14399-4:2005



EN 14399-4:2005 (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 utilize 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 structuring 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, the 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. Table 1 — Systems of bolt/nut/washer assemblies
Bolt/nut/washer assembly System HR Bolt/nut/washer assembly System HV General requirements EN 14399-1 Bolt/nut assembly EN 14399-3 EN 14399-4 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 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 coatings 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 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 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. For the time being, the product standards EN 14399-3 to EN 14399-6 are the only European Standards which have regard to the general requirements of EN 14399-1. However, further product standards on  fit bolts,  countersunk head bolts, and  load indicating washers for the use in high strength structural bolting for preloading are under preparation. SIST EN 14399-4:2005



EN 14399-4:2005 (E) 5 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 M 12 to M 36 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×As 1) according to ENV 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 or to EN 14399-5 (un-der the nut only). 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 ENV 1090-1 is made. The test method for suitability for preloading is specified in EN 14399-2. Clamp lengths for the bolt/nut/washer assemblies are given in the normative Annex A. 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 493, Fasteners — Surface discontinuities — Nuts. 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, High-strength structural bolting assemblies for preloading — Part 2: Suitability test 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 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). 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).
1)
fub is the nominal tensile strength (Rm) and As the stress area of the bolt. SIST EN 14399-4:2005



EN 14399-4:2005 (E) 6 EN ISO 10684, Fasteners - Hot dip galvanized coatings (ISO 10684:2004). ISO 148, Steel — Charpy impact test (V-notch). 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.
NOTE The difference between lg and ls should not be less than 1,5 P. Key a Incomplete thread u ≤ 2P b 15° to 30° Figure 1 — Dimensions of bolts SIST EN 14399-4:2005



EN 14399-4:2005 (E) 7 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
min. 0,4 0,4 0,4 0,4 0,4 0,4 0,4 0,4
c
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
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
ds
max. 12,7 16,7 20,84 22,84 24,84 27,84 30,84 37
min. 20,1 24,9 29,5 33,3 38,0 42,8 46,6 55,9
dw
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
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
k
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
max. 22 27 32 36 41 46 50 60
s
min. 21,16 26,16 31 35 40 45 49 58,8 l ls and lg d
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
9,5 17
8,5 16
55 53,5
56,5
26,75 32 21 27 14,5 22 13,5 21
60 58,5
61,5 31,75 37 26 32 19,5 27 18,5 26 12 21
65 63,5
66,5 36,75 42 31 37 24,5 32 23,5 31 17 26
70 68,5
71,5 41,75 47 36 42 29,5 37 28,5 36 22 31 20 29
75 73,5
76,5 46,75 52 41 47 34,5 42 33,5 41 27 36 25 34 20,5 31
80 78,5
81,5 51,75 57 46 52 39,5 47 38,5 46 32 41 30 39 25,5 36
85 83,25
86,75 56,75 62 51 57 44,5 52 43,5 51 37 46 35 44 30,5 41 21 33 90 88,25
91,75 61,75 67 56 62 49,5 57 48,5 56 42 51 40 49 35,5 47 26 38
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