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 | |
