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EN14399 Hex Head Bolt Specification

This standard on structural bolting reflects the situation in Europe where two technical solutions exist to achieve the necessary ductility of bolt/nut/washer assemblies.
EN14399 Hex Head Bolt

High-strength structural bolting assemblies for preloading

This standard 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. It is importance 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.

ENEN 14399-1 High Strength Structural Bolting Assemblies for Preloading

Longteng Steel is qualified to manufacture pre-load bolt assemblies as high strength structural bolt according to BS EN 14399-1:2015, thisHigh-strength structural bolting assemblies for preloading is classified in these ICS categories: High-strength structural bolting assemblies in accordance with EN 14399-2 to EN 14399-10 are designed to fulfil the requirements of this European Standard. High-strength structural bolting assemblies are suitable for preloading in accordance with EN 1090-2 in steel structures.
NOTE
According to this standard, high-strength structural bolting assemblies smaller than M12 are not designed to be preloaded. Longteng supplies structural hex head bolt in following sizes: M30, M33, M36, M39, M42, M45, M48, M52, M56, M60, M64, this type of hex head bolt is not suitable for railway fastener and weld treatment.

EN 14399-2 High-strength structural bolting assemblies for preloading Suitability for Preloading

This document on structural bolting reflects the situation in Europe where two technical solutions exist to achieve the necessary ductility of bolt/nut/washer(s) 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.

BS EN 14399-3 High-strength structuralbolting assemblies for preloading HR system

EN 14399-4 PRE-LOAD BOLTING ASSEMBLIES HV Pre-Load Bolt Assemblies HV BS

Thread d M12 (M14)b M16 (M18)b M20
PC 1.75 2 2 2.5 2.5
b d 30 34 38 42 46
e 40 44 48 52
f 65
c max 0.8 0.8 0.8 0.8 0.8
min 0.4 0.4 0.4 0.4 0.4
da max 15.2 17.2 19.2 21.7 24.4
ds max 12.70 14.70 16.70 18.70 20.84
min 11.30 13.3 15.30 17.3 19.16
dw max g g g g g
min 20.1 22 24.9 27.7 29.5
e min 23.91 26.17 29.56 32.95 35.03
K non 7.5 8.8 10 11.5 12.5
max 7.95 9.25 10.75 12.4 13.40
min 7.05 8.35 9.25 10.6 11.60
Kw min 4.9 5.85 6.5 7.42 8.1
r min 1.2 1.2 1.2 1.5 1.5
S max 22 24 27 30 32
min 21.16 23.16 26.16 29.16 31
  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

EN 14399-5:2015 Pre-Load Bolt Assemblies Plain Washers

This European Standard specifies, together with EN 14399-1 and EN 14399-2 , hardened and tempered plain washers intended for bolting assemblies with large series hexagon high-strength structural bolts and nuts with threads from M12 to M36 inclusive. Washers according to this standard can be applied under the nut only. Washers according to this standard are not intended to be used in direct contact with oversized or slotted holes.

DIN EN 14399-6 High-strength structural bolting assemblies for preloading – Part 6: Plain Chamfered Washers

Nominal size
(nominal thread diameter of associated bolt)
12 16 20 22 24 27 30 36
1 min >13 17 21 23 25 28 31 37
max 13.27 17.27 21.33 23.33 25.33 28.52 31.62 37.62
d2 min 23.48 29.48 36.38 38.38 43.38 49.0 54.80 64.80
max 24 30 37 39 44 50 56 66
h nom 3 4 4 4 4 5 5 6
min 2.7 3.7 3.7 3.7 3.7 4.4 4.4 5.4
max 3.3 4.3 4.3 4.3 4.3 5.6 5.6 6.6
e nom=min 0.5 0.75 0.75 0.75 0.75 1 1 1.25
max 1 1.5 1.5 1.5 1.5 2.0 2.0 2.5
c min 1.6 1.6 2.0 2.0 2.0 2.5 2.5 2.5
max 1.9 1.9 2.5 2.5 2.5 3.0 3.0 3.0

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