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| EN 14399 Plain Washers Specification-NINGBO BOLT |
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| EN14399-6 Hardened Plain Washers |
EN 14399 Plain Washers 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 ｀H¨ means that the product was manufactured to BS EN 14399-3 & BS EN 14399-4
EN14399-5 PLAIN WASHERS & EN14399-6 PLAIN CHAMFERED WASHERS
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Characteristic |
Standard |
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Material |
Steel |
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General Requirements |
EN 14399-1 |
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Hardness Range |
300 HV to 370 HV |
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Tolerances (International Standard) |
EN ISO 4759-3 |
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Surface |
Self Colour |
Finished result from manufacturing with a light coating of oil |
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Finish |
Hot Dipped Galvanised |
EN ISO 10684 |
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Others |
As agreed. Cadmium or cadmium alloy are not permitted. |
EN14399-9 DIRECT TENSION INDICATOR WASHER
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Characteristic |
Standard |
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Material |
Steel |
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General Requirements |
EN 14399-1 |
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Heat Treatment |
Hardened & tempered or controlled rolled & tempered |
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Maximum Hardness |
380 HV |
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Associated bolts & nuts |
EN14399-3, EN14399-4, EN14399-7 or EN14399-8 |
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Tolerances (International Standard) |
EN ISO 4759-3 |
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Surface |
Self Colour |
Finished result from manufacturing with a light coating of oil |
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Finish |
Sherardized |
EN 13811 |
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Others |
As agreed. Cadmium or cadmium alloy are not permitted. |
INDICATOR COMPRESSION LOADS AT APPROPRIATE GAP
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Diameter |
Compressed Load |
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Designation H8 |
Designation H10 |
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Min. |
Max. |
Min. |
Max. |
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M12 |
47 |
56 |
59 |
71 |
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M16 |
88 |
106 |
110 |
132 |
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M20 |
137 |
164 |
172 |
206 |
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M22 |
170 |
204 |
212 |
254 |
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M24 |
198 |
238 |
247 |
296 |
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M27 |
257 |
308 |
321 |
385 |
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M30 |
314 |
377 |
393 |
472 |
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M36 |
458 |
550 |
572 |
688 |
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