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DIN EN 14399 8 Standard Dimensions for High-strength structural bolting assemblies for preloading - Part 8: System HV - Hexagon fit bolt and nut assemblies

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Technical History and International Equivalents of DIN EN 14399 8

Equivalent standards: UNI EN 14399 8 NF EN 14399 8 BS EN 14399 8

In Europe there are two solutions to achieve the necessary ductility of bolt/nut/washer assemblies: system HR and HV. Both systems are well proved, however it is important to avoid mixing up the components of both systems. For this reason the systems are standardized in one single part and the marking of the components of the same system is uniform (Table 1). Preloaded bolted assemblies are very sensitive to differencies in manufacture and lubrification; it is important that the assembly is supplied by one manufacturer who is always responsible for the function of the assembly and the coating. It is necessary the CE marking on packages/boxes and/or the accompanying commercial documents. In addition to individual components suitability, the norm also supplies a procedure how to achieve the right preload for the assembly functionality.

Dimensional Drawing and Technical Diagrams

1653_3530.jpg

Key Dimensions and Technical Parameters

Bolts - dimensions in mm - source EN 14399-06/2019 Supercedes EN 14399-8 2008

d1 thread size
P
 k nom
b nom
 d nom y max e min s max
M 12
1.75
 8 23 13 6.5 23.91 22
M 16
2
 10 28 17 7.5 29.56 27
M 20
2.5
 13 33 21 8.5 35.03 32
M 22
2.5
 14 34 23 8.5 39.55 36
M 24
3
 15 39 25 10 45.2 41
M 27
3
 17 41 28 10 50.85 46
M 30
3.5
 19 44 31 11.5 55.37 50
M 36
4
 23 52 37 13 66.44 60

Bolts - dimensions in mm - source EN 14399-8 2008

d1 thread size
P
 k nom
b nom
 d nom y max e min s max
M 12
1.75
 8 23 13 6.5 23.91 22
M 16
2
 10 28 17 7.5 29.56 27
M 20
2.5
 13 33 21 8.5 35.03 32
M 22
2.5
 14 34 23 8.5 39.55 36
M 24
3
 15 39 25 10 45.2 41
M 27
3
 17 41 28 10 50.85 46
M 30
3.5
 19 44 31 11.5 55.37 50
M 36
4
 23 52 37 13 66.44 60

Nuts - dimensions in mm - source EN 14399-8 2008
d thread size Pitch s nom=max s min e min m max m min
M 12 1.75 22 21.16 23.91 10 9.64
M 16 2 27 26.16 29.56 13 12.3
M 20 2.5 32 31 35.03 16 14.9
M 22 2.5 36 35 39.55 18 16.9
M 24 3 41 40 45.02 20 18.7
M 27 3 46 45 50.85 22 20.7
M 30 3.5 50 49 55.37 24 22.7
M 36 4 60 58.8 66.44 29 27.7

Table 1 - Systems of bolt/nut/washer assemblies
Bolt/nut/washer assembly System HR - Garniture aus Schrauben/Muttern und Scheiben System HR - Assieme bullone/dado/rondella sistema HR
 Bolt/nut/washer assembly System HV - Garniture aus Schrauben/Muttern und Scheiben System HV - Assieme bullone/dado/rondella sistema HV
General requirements Allgemeine Anforderungen Requisiti generali
EN 14399-1
Bolt/nut assembly - Garnitur aus Schraube und Mutter - assieme bullone/dado EN 14399-3 EN 14399-4
Marking - Kennzeichnung - Marcatura
 HR HV
Property classes - Festigekeitklasse - Classi di resistenza 8.8/8 10.9/10 10.9/10
Washers - Scheiben - Rondelle
 EN 14399-5 OR EN 14399-6 EN 14399-5 OR EN 14399-6
Marking - Kennzeichnung - Marcatura
 H H
Suitability test for preloading - Eignungsprüfung für das Vorspannen - Prova di idoneità all''impiego
 EN 14399-2 EN 14399-2

Reproduced by permission of DIN Deutsches Institut für Normung e. V. The definitive version for the implementation of this standard is the edition bearing the most recent date of issue, obtainable from Beuth Verlag GmbH, Burggrafenstraße 6, 10787 Berlin, Germany.
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