EN 14399 Structural Washers
| Standard | DIN 6916 · EN 14399-6 |
|---|---|
| Material | 40Cr / 42CrMo / 42CrMo4 |
| Strength Grade | 300HV / 350HV |
| Size Range | M12-M64 |
| Surface Treatment | HDG / Zinc Flake |
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Product Description
Product Description & Key Specifications
EN 14399 structural washers are hardened washers used in preloaded structural bolting systems for wind tower flanges, railway infrastructure, bridge steelwork and heavy steel connections. They are supplied to EN 14399-6 / DIN 6916 with 300HV or 350HV hardness requirements depending on the assembly specification.
These washers are selected for controlled bearing support under the bolt head or nut in structural joints. They should not be replaced by ordinary flat washers when the project specifies EN 14399 dimensions, hardness, chamfer, coating or assembly behavior. Material options include 40Cr, 42CrMo and 42CrMo4.
Hot-dip galvanized washers are common for outdoor steel structures, while zinc flake finish can be selected where corrosion protection and controlled coating thickness are required. Washer size, hardness, finish and assembly pairing should match the EN 14399 bolt and nut system before ordering.
| Product type | EN 14399 structural washers / hardened structural washers |
|---|---|
| Standards | EN 14399-6 / DIN 6916 |
| Material | 40Cr / 42CrMo / 42CrMo4 |
| Strength grade | 300HV / 350HV |
| Size range | M12-M64 |
| Common models | M16, M20, M24, M30, M36, M42, M48, M56, M64 |
| Washer form | Structural washer with standard diameter, thickness and chamfer |
| Surface finish | Hot-dip galvanized / Zinc flake |
| Matched hardware | EN 14399 bolts and class 10 / 12 heavy hex nuts |
| Documentation | MTC, hardness report, dimensional report and coating report on request |
Dimensions & SpecificationsDIN 6916 / EN 14399-6
Technical Drawing
Dimensional Table
| Parameter | Φ12 | Φ16 | Φ20 | Φ22 | Φ24 | Φ27 | Φ30 | Φ36 |
|---|---|---|---|---|---|---|---|---|
| d/min | 13 | 17 | 21 | 23 | 25 | 28 | 31 | 37 |
| d/max | 13.27 | 17.27 | 21.33 | 23.33 | 25.33 | 28.52 | 31.62 | 37.62 |
| dc/max | 24 | 30 | 37 | 39 | 44 | 50 | 56 | 66 |
| dc/min | 23.48 | 29.48 | 36.38 | 38.38 | 43.38 | 49 | 54.8 | 64.8 |
| h/max | 3.3 | 4.3 | 4.3 | 4.3 | 4.3 | 5.6 | 5.6 | 6.6 |
| h/min | 2.7 | 3.7 | 3.7 | 3.7 | 3.7 | 4.4 | 4.4 | 5.4 |
| c | 0.5 | 1 | 1 | 1 | 1 | 1 | 1 | 1.5 |
Engineering references
Technical resources
Review the applicable dimensions, drawing and standard relationship before confirming the ordered specification.02
Selection
Selection Advantages by Application
Wind Tower Flange Bolting
M36-M64 EN 14399 washers are frequently used with large preloaded bolt assemblies in wind tower flanges. HDG finish and lot traceability are common procurement requirements.
Renewable energy fastenersRailway Bridges and Steel Structures
DIN 6916 / EN 14399-6 washers support railway bridge joints, station steelwork and transit infrastructure where hardened structural washers are specified.
Railway fastenersBridge and Heavy Construction
300HV / 350HV washers provide hardened bearing support in bridge and construction steelwork. Confirm washer hardness and coating with the bolt-nut assembly standard.
Construction fasteners03
Assembly
Recommended Matching Products
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Manufacturing
Manufacturing & Quality Control
Manufacturing CapabilityQuality Control
Washer blanking or machining from alloy steel material40Cr / 42CrMo / 42CrMo4 material and heat number verification
Heat treatment to 300HV / 350HV washer requirementsHardness testing and dimensional inspection by lot
HDG or zinc flake finishing for structural environmentsCoating thickness, adhesion and visual checks after finishing
Washer supply alone or as EN 14399 assembly componentInner diameter, outer diameter, thickness and chamfer inspection
Project packaging for tower, bridge and railway jobsMTC, CoC, hardness and coating documents prepared on request
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FAQ
Common Questions Before RFQ
What is EN 14399-6 used for?
EN 14399-6 covers hardened washers used with high-strength preloaded structural bolting assemblies in steel construction.
Are EN 14399 washers the same as ordinary flat washers?
No. EN 14399 washers have specified structural dimensions and hardness. Ordinary flat washers should not replace them in preloaded structural assemblies.
What is the difference between 300HV and 350HV washers?
They refer to washer hardness classes. The required class depends on the bolt assembly standard and project specification.
Which finishes are available?
Hot-dip galvanized and zinc flake finishes are available. Selection should match corrosion requirements and the rest of the bolt-nut-washer system.
Can washers be supplied with hardness reports?
Yes. Hardness reports, dimensional reports, coating reports and material certificates can be supplied when specified in the RFQ.
Need EN 14399 structural washers?
Send washer size, hardness class, finish, matching bolt/nut system, quantity and documentation needs. We can quote EN 14399-6 / DIN 6916 washers for wind, railway and bridge projects.
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