EN 14399 Heavy Hex Nuts
| Standard | DIN EN 14399 · EN 14399 |
|---|---|
| Material | 42CrMo4 / 34CrNiMo6 |
| Strength Grade | 10 / 12 |
| Size Range | M36-M64 |
| Surface Treatment | Hot-Dip Galvanized |
01
Product Description
Product Description & Key Specifications
EN 14399 heavy hex nuts are supplied for preloaded structural bolting systems used in wind turbine towers, power generation structures, bridge steelwork and heavy steel connections. Material options include 42CrMo4 and 34CrNiMo6, with class 10 or class 12 nut strength selected according to the compatible EN 14399 bolt assembly.
EN 14399 components should be treated as part of a system, not as generic heavy hex nuts. The correct procurement route should confirm bolt type, nut class, washer standard, lubrication condition, hot-dip galvanized finish, k-class or installation requirements, and whether the project requires assembly testing or lot traceability.
Large sizes such as M36, M42, M48, M56 and M64 are common in wind tower flange and heavy structural applications. Hot-dip galvanizing provides outdoor corrosion protection, while thread fit, coating thickness and assembly compatibility must be controlled so the nut works correctly with the selected preloaded bolt system.
| Product type | EN 14399 heavy hex nuts for preloaded structural bolting |
|---|---|
| Standards | DIN EN 14399 / EN 14399 |
| Material | 42CrMo4 / 34CrNiMo6 |
| Strength grade | Class 10 / 12 |
| Size range | M36-M64 |
| Common models | M36, M42, M48, M56, M64 heavy hex nuts |
| Thread type | Metric thread for EN 14399 preloaded bolt assemblies |
| Surface finish | Hot-dip galvanized |
| Matched hardware | EN 14399 bolts and EN 14399-6 / DIN 6916 structural washers |
| Documentation | MTC, CoC, hardness, proof load, coating and assembly documents on request |
Dimensions & SpecificationsEN 14399-3 HR Nuts
Technical Drawing
Dimensional Table
| Parameter | M12 | M14 | M16 | M18 | M20 | M22 | M24 | M27 | M30 | M36 |
|---|---|---|---|---|---|---|---|---|---|---|
| P | 1.75 | 2 | 2 | 2.5 | 2.5 | 2.5 | 3 | 3 | 3.5 | 4 |
| e/min | 23.91 | 26.17 | 29.56 | 32.95 | 35.03 | 39.55 | 45.2 | 50.85 | 55.37 | 66.44 |
| k/max | 10.8 | 12.8 | 14.8 | 15.8 | 18 | 19.4 | 21.5 | 23.8 | 25.6 | 31 |
| k/min | 10.37 | 12.1 | 14.1 | 15.1 | 16.9 | 18.1 | 20.2 | 22.5 | 24.3 | 29.4 |
| s/max | 22 | 24 | 27 | 30 | 32 | 36 | 41 | 46 | 50 | 60 |
| s/min | 21.16 | 23.16 | 26.16 | 29.16 | 31 | 35 | 40 | 45 | 49 | 58.8 |
02
Selection
Selection Advantages by Application
Wind Turbine Tower Flanges
Large EN 14399 class 10 / 12 nuts are used in wind tower flange bolting, often in M36-M64 sizes with hot-dip galvanized finish and strict lot traceability.
Renewable energy fastenersPower Generation Steel Structures
Preloaded structural nuts support heavy energy structures, platforms and equipment steelwork where controlled assembly behavior and coating compatibility are required.
Power generation fastenersBridge and Heavy Steelwork
EN 14399 nuts can be specified for European preloaded bolting systems in bridges and heavy steel connections. Confirm the complete bolt-nut-washer system before ordering.
Construction fasteners03
Assembly
Recommended Matching Products
04
Manufacturing
Manufacturing & Quality Control
Manufacturing CapabilityQuality Control
Forging and heat treatment for class 10 / 12 heavy hex nuts42CrMo4 / 34CrNiMo6 material and heat number verification
Large-size tapping for M36-M64 EN 14399 assembliesThread gauge, hardness and proof load inspection by lot
Hot-dip galvanizing with thread fit controlCoating thickness, nut fit and visual inspection after galvanizing
Bolt-nut-washer set supply for preloaded systemsAssembly compatibility and traceability documents prepared when specified
Heavy export packaging for tower and infrastructure projectsPackage labeling by size, grade, heat and coating batch
05
FAQ
Common Questions Before RFQ
What are EN 14399 heavy hex nuts used for?
They are used in preloaded structural bolting systems for wind towers, bridges, power structures and heavy steel connections.
Can EN 14399 nuts be purchased separately?
They can be supplied separately, but the bolt, nut, washer, coating and lubrication condition should be confirmed as a compatible EN 14399 assembly.
What sizes are common for wind tower nuts?
Common RFQ sizes include M36, M42, M48, M56 and M64, depending on tower flange design and project specification.
Why is hot-dip galvanized finish common?
HDG provides outdoor corrosion protection for exposed wind tower and heavy steel structures, but thread fit and coating thickness must be controlled.
Can assembly documents be supplied?
Yes. Material certificates, coating reports, hardness or proof load reports and assembly traceability documents can be supplied when specified.
Need EN 14399 heavy hex nuts for preloaded assemblies?
Send the EN 14399 system, nut class, size, bolt and washer pairing, HDG requirement, quantity and documentation scope. We can quote large M36-M64 structural nuts for wind tower and heavy steel projects.
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