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| EN 14399 Structural Nuts Specification-NINGBO BOLT |
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| EN14399-4 High-Strength Structural Nuts |
EN 14399 Structural Nuts Specification
HIGH-STRENGTH STRUCTURAL BOLTING ASSEMBLIES FOR PRELOADING
Structural bolting in Europe comprises two technical solutions to achieve the necessary ductility of bolt/nut/washer assemblies. These solutions utilize different systems (HR and HV) of bolt/nut/washer assemblies, see table below. Both systems are well proved and it is up to the experts responsible for structural bolting whether they use the one or the other system.
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Items |
Bolt/Nut/Washer Assembly |
Bolt/Nut/Washer Assembly |
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System |
System HR |
System HV |
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General Requirements |
EN 14399-1 |
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Bolt/Nut Assembly |
EN 14399-3 |
EN 14399-4 |
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Marking |
HR |
HV |
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Property Class |
8.8/8 |
10.9/10 |
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Washer(s) |
EN 14399-5 or EN 14399-6 |
EN 14399-5 or EN 14399-6 |
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Marking |
H |
H |
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Suitability Test for |
EN 14399-2 |
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Preloading |
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EN 14399 PARTS 1-10
There are currently 10 parts BS EN 14399 which are listed in the table below.
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BS EN 14399 Part One |
General Requirements |
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BS EN 14399 Part Two |
Suitability test for Preloading (assembly test)* |
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BS EN 14399 Part Three |
Hexagon Bolt and Nut Assemblies (HR 8.8 and 10.9) |
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BS EN 14399 Part Four |
Hexagon Bolt and Nut Assemblies (HV 10.9) |
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BS EN 14399 Part Five |
Plain Washers |
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BS EN 14399 Part Six |
Plain Chamfered Washers |
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BS EN 14399 Part Seven |
Countersunk Bolt and Nut (HR 8.8 and 10.9) |
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BS EN 14399 Part Eight |
Hexagon Fitted Bolt and Nut Assemblies (HV 10.9) |
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BS EN 14399 Part Nine |
Direct Tension Indicators |
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BS EN 14399 Part Ten |
Tension Control Bolt and Nut Assemblies (HRC 10.9) |
HEAD MARKINGS
Note: The ｀8 HR, 10 HR¨ means that the product was manufactured to BS EN 14399-3
Note: The ｀10 HR¨ means that the product was manufactured to BS EN 14399-4
EN14399-3 Class 8.8HR AND 10.9HR MECHANICAL PROPERTIES OF NUTS
|
Nominal Stress area of standard test |
Proof Load kN |
Vickers Hardness 8HR |
Vickers Hardness 10HR |
|||
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mandrel (mm2) |
8HR |
10HR |
Min. |
Max. |
Min. |
Max. |
|
84.3 |
84.3 |
97.8 |
200 |
302 |
272 |
353 |
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157 |
157 |
182.1 |
200 |
302 |
272 |
353 |
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245 |
245 |
284.2 |
233 |
353 |
272 |
353 |
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303 |
303 |
351.2 |
233 |
353 |
272 |
353 |
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353 |
353 |
409.5 |
233 |
353 |
272 |
353 |
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459 |
459 |
532.4 |
233 |
353 |
272 |
353 |
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561 |
561 |
650.8 |
233 |
353 |
272 |
353 |
|
817 |
817 |
947.7 |
233 |
353 |
272 |
353 |
EN14399-4 Class 10HV MECHANICAL PROPERTIES OF NUTS
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Diameter |
Nominal Stress area of standard test mandrel |
Proof Load kN |
Vickers Hardness 10HV |
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(mm2) |
10 |
Min. |
Max. |
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M12 |
84.3 |
97.8 |
272 |
353 |
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M16 |
157 |
182.1 |
272 |
353 |
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M20 |
245 |
284.2 |
272 |
353 |
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M22 |
303 |
351.2 |
272 |
353 |
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M24 |
353 |
409.5 |
272 |
353 |
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M27 |
459 |
532.4 |
272 |
353 |
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M30 |
561 |
650.8 |
272 |
353 |
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M36 |
817 |
947.7 |
272 |
353 |
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