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The launch of the European standards for design and fabrication (BS EN 1090-1 & 2) of Structural Steelwork, is associated with the introduction of a set of European standards harmonising the best of all European countries standards for non-preloadable

(BS EN 15048) and preloadable (BS EN 14399) High Strength Structural bolting.

BS EN 14399 - 1 to 10 High Strength Structural Bolting Assemblies For Preloading

BS EN 14399-1:2015 General Requirements

 

This European Standard specifies the general requirements for bolt/nut/washer(s) assemblies for high-strength structural bolting, which are suitable for preloading.

 

The intended use of bolting assemblies in accordance with this European Standard is structural metallic works.

BS EN 14399-2:2015 Suitability Test

for Preloading

 

This European Standard specifies a tightening test to verify the suitability of high strength bolt/nut/washer assemblies for preloaded bolted connection in metallic structures.

 

The purpose of this test is to check the behaviour of the fastener assembly so as to ensure that the required preload can be reliably obtained by the tightening methods specified in ENV 1090-1 with sufficient margins against over tightening and against failure.

BS EN 14399-3:2015 System HR Hexagon Bolt and Nut Assemblies

 

This European Standard, together with EN 14399-1, specifies the requirements for assemblies of high-strength structural bolts and nuts of system HR suitable for preloaded joints with large widths across flats.

 

Bolt and nut assemblies conforming to this standard have been designed to allow preloading in accordance with ENV 1993-1-1 (Eurocode 3) and to obtain ductility predominantly by plastic elongation of the bolt.

 

Click here for BS EN 14399 HR Preload Assembly Documentation

BS EN 14399-4:2015 System HV Hexagon Bolt and Nut Assemblies

 

The main difference between a HV and HR is that the HV use a thinner nut to the HR, and require greater control over manufacture, lubrication and installation. They are used in some continental European countries but customarily in Germany. If they were to be used instead of system HR bolts, the differences would have to be recognised by both designer and steelwork contractor; the use of both systems on the same job should always be avoided, because of the risks of confusion and misuse.

 

Click here for BS EN 14399 HV Preload Assembly Documentation

BS EN 14399-5:2015 Plain Washers

 

This European Standard specifies hardened and tempered plain washers intended for assembly 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. Attention is drawn to the importance of ensuring that the washers are correctly used if satisfactory results are to be obtained.

 

For recommendations concerning proper application,

please refer to ENV 1090-1.

BS EN 14399-6:2015 Plain

Chamfered Washers

 

This Standard, together with EN 14399-1, specifies requirements for hardened and tempered plain washers with chamfer intended for assembly with large series hexagon high-strength structural bolts and nuts with thread sizes from M12 to M36 inclusive.

 

It also covers designation and marking requirements as well as providing details of reference standards.

BS EN 14399-7:2008 System HR Countersunk Head Bolt and Nut Assemblies

 

This European Standard specifies requirements for

high-strength structural bolting assemblies for preloading.

 

System HR. Countersunk head bolt and nut assemblies.

BS EN 14399-8:2008 System HVP Hexagon Fit Bolt and Nut Assemblies

 

This European Standard specifies requirements for

high-strength structural bolting assemblies for preloading.

 

System HV. Hexagon fit bolt and nut assemblies

BS EN 14399-9:2008 Direct Tension Indicators for use with Bolt and Nut Assemblies

 

BS EN 14399-9 specifies, together with BS EN 14399-1,

the requirements for assemblies of high-strength structural bolts and nuts, with large width across flats, of system HR or HV, including the requirements for the general dimensions, tolerances, materials and performance for two grades,

H8 and H10, of compressible washer-type direct tension indicators, nut face washers and bolt face washers suitable for preloaded joints.

 

Click here for BS EN 14399-9 DTI Documentation

BS EN 14399-10:2009 System HRC Bolt and Nut Assemblies with

calibrated preload

 

Developed for more simplified bolt fastening and more accurate performance. HRC (tension control) bolts offer excellent characteristics.Although HRC assemblies are designed to withstand the maximum preloads that can occur when contaminated with water, we would advise that tightening of HRC assemblies is avoided in the rain.

 

Click here for BS EN 14399 HRC Preload Assembly Documentation

KEY NOTES

There are two types of pre-loadable bolt assembly, the British/French HR bolts covered by BS EN 14399-3 and the German HV Assembly covered by BS EN 14399-4. The HR Assembly is similar to the BS 4395 bolt and is generally less sensitive to over-tightening. The HV assembly is more sensitive to over-tightening and requires more control on site. Components from both types of bolt assembly must not be mixed up. Three methods of tightening are given in the European fabrication standard BS EN 1090-2; torque control method, ‘combined ‘method and the direct tension indicator method.

 

The direct tension indicator method is popular in the UK. The requirements for CE Marking of pre-loadable fasteners are given in BS EN 14399-1. Preloadable bolts have advantages if vibration is present, slip between joining parts must be avoided and the applied load through the joint frequently changes from a positive to a negative value. Otherwise standard, non-preloadable, grade 8.8SB bolts will prove more economical.

 

History and related standards

This European Standard together with BS EN 14399-1:2005, BS EN 14399-2:2005,BS EN 14399-4:2005, BS EN 14399-5:2005 and BS EN 14399-6:2005, supersedes BS 4395-1:1969 and BS 4395-2:1969, which are declared obsolescent since

September 2007, and together with BS 449 and BS 5950, will be withdrawn upon publication of Eurocode 3. (BS 4395-1:1969

and BS 4395-2:1969 currently support BS 449 and BS 5950.)

 

Cross-references

EN 493, EN 10045-1, EN 14399-1, EN 14399-2, EN 14399-5, EN 14399-6, EN 20898-2, EN 26157-1, EN ISO 898-1,

EN ISO 3269, EN ISO 4759-1, EN ISO 10684, ISO 148, ISO 261, ISO 965-2 and ISO 965-5.

CE & Head Marking

Please note: All preload and non-preload bolt assemblies are sensitive to differences in manufacture and lubrication. Therefore it is important that the assembly is supplied by one single manufacturer only, who is responsible for the function of the assembly. For the same reason, it is important that the coating 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 specific assembly can be achieved if tightened with a suitable procedure. For this purpose a test method for the suitability of the components for preloading and non-preload was created within the standard (BS EN 14399-2 & BS EN 15048-2), which will demonstrate whether the function of the assembly is fulfilled. From 1 July 2014 it is now a legal requirement under BS EN-1090 (LINK) for all parts

of a bearing steel structure to bear the CE mark for both preloaded and non-preloaded.

 

Please note: It is crucial to ensure bolting assemblies are correctly used if satisfactory results are to be obtained.

For recommendations concerning proper application, refer to EN 1090-2 (LINK). General requirements and suitability for preloading are specified

in EN 14399-2 (LINK). Also note that the fact that the assemblies may be subject to plastic strains during tightening means that bolts and nuts that have been fully preloaded must not be re-used once removed.

 

BS EN 15048 1 & 2 Non-Preloaded Structural Bolting Assemblies

EN 15048 contains regulations governing products used for the design, calculation and manufacture of non-preloaded bolt connections for Steel and Aluminium Structures.

 

Part 1 sets out the general requirements and Part 2 the suitability testing required.

BS EN 15048-1:2016

General Requirements

 

This standard specifies the general requirements for bolting assemblies for non-preloaded structural bolting. Bolting assemblies in accordance with this European Standard are designed to be used in structural bolting connections for shear and/or tensile loading.

 

Link to 15048 Product

BS EN 15048-2:2016

Fitness for Purpose

 

For all EN 15048-1 bolting assemblies this standard specifies the technical requirements in order to ensure the suitability for non-preloaded bolted connections in Steel or Aluminium structures.

A suitability test is specified to check the behaviour of the structural bolting assemblies.

 

 Link to 15048 Product

 

History and related standards:

EN 1090-1 (LINK) sets the requirements for CE marking for steel and aluminium bearing construction parts with references for implementation to EN 1090-2 and EN 1090-3.  EN 1090-2 describes the bolt connectors in which reference is made to standard EN 15048 for non-preloaded structural bolts and EN 14399 (LINK) for preloaded bolts.

 

Cross References:

EN 1993-1-8:2005, EN 15048-1:2016, EN 28839, ISO 8839:1986, EN ISO 898-1, ISO 898-1, EN ISO 898-2, ISO 898-2,

EN ISO 3506-1, ISO 3506-1, EN ISO 3506-2, ISO 3506-2, EN ISO 4014, ISO 4014, EN ISO 4016, ISO 4016, EN ISO 4017,

ISO 4017, EN ISO 4018, ISO 4018, EN ISO 4032, ISO 4032, EN ISO 4033, ISO 4033, EN ISO 4034, ISO 4034, EN ISO 6892-1, ISO 6892-1, EN ISO 7500-1, ISO 7500-1, ISO 273, EN 1090-2, EN 1090-3, EN ISO 2320, ISO 2320, EN ISO 7040, ISO 7040,

EN ISO 7042, ISO 7042, EN ISO 7089, ISO 7089, EN ISO 7094, ISO 7094, EN ISO 7719, ISO 7719, ISO 7041

Please note: All preload and non-preload bolt assemblies are sensitive to differences in manufacture and lubrication. Therefore it is important that the assembly is supplied by one single manufacturer only, who is responsible for the function of the assembly. For the same reason, it is important that the coating 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 specific assembly can be achieved if tightened with a suitable procedure. For this purpose a test method for the suitability of the components for preloading and non-preload was created within the standard (BS EN 14399-2 & BS EN 15048-2), which will demonstrate whether the function of the assembly is fulfilled. From 1 July 2014 it is now a legal requirement under BS EN-1090 (LINK) for all parts

of a bearing steel structure to bear the CE mark for both preloaded and non-preloaded.

 

Please note: It is crucial to ensure bolting assemblies are correctly used if satisfactory results are to be obtained.

For recommendations concerning proper application, refer to EN 1090-2 (LINK). General requirements and suitability for preloading are specified

in EN 14399-2 (LINK). Also note that the fact that the assemblies may be subject to plastic strains during tightening means that bolts and nuts that have been fully preloaded must not be re-used once removed.

 

BS EN 1090-1, 2 & 3

BS EN 1090-1, 2 & 3 are harmonised standards which covers the Design of Steel and Aluminium. Structures with Products within this scope that must be CE marked when released to the market. BS EN 1090 consists of 3 parts.

BS EN 1090-1:2009 + A1:2011

 

Covers the requirements for conformity assessment including instructions on how to CE mark products.

 

BS EN 1090-2:2008 +A1:2011


Covers the technical requirements for Steel Structures.

 

BS EN 1090-3:2008


Covers the technical requirements for Aluminium Structures.

For a more in-depth detail of the EN 1090 standard head to:

 

www.bsigroup.com/LocalFiles/en-GB/Kitemark/EN1090/BSI-EN-1090-Structural-Steel-Guide-UK-EN.pdf

EN15048-1

0038/CPR/4006773/C

EN14399-1

0038/CPR/4006773/B

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