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 dM12(M14)bM16(M18)bM20
PC1.75222.52.5
bd3034384246
e40444852
f65
cmax0.80.80.80.80.8
min0.40.40.40.40.4
damax15.217.219.221.724.4
dsmax12.7014.7016.7018.7020.84
min11.3013.315.3017.319.16
dwmaxggggg
min20.12224.927.729.5
emin23.9126.1729.5632.9535.03
Knon7.58.81011.512.5
max7.959.2510.7512.413.40
min7.058.359.2510.611.60
Kwmin4.95.856.57.428.1
rmin1.21.21.21.51.5
Smax2224273032
min21.1623.1626.1629.1631
 Bolt/nut/washer assembly System HRBolt/nut/washer assembly System HV
General RequirementsEN 14399-1
Bolt/nut assemblyEN 14399-3EN 14399-4
MarkingHRHV
Property classes8.8/8 10.9/1010.9/10
Washer(s)EN 14399-5 or EN 14399-6EN 14399-5 or EN 14399-6
MarkingHH
Suitability test for preloadingEN 14399-2EN 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)
1216202224273036
1min >1317212325283137
max13.2717.2721.3323.3325.3328.5231.6237.62
d2min23.4829.4836.3838.3843.3849.054.8064.80
max2430373944505666
hnom34444556
min2.73.73.73.73.74.44.45.4
max3.34.34.34.34.35.65.66.6
enom=min0.50.750.750.750.75111.25
max11.51.51.51.52.02.02.5
cmin1.61.62.02.02.02.52.52.5
max1.91.92.52.52.53.03.03.0

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