Wind turbines operate under extreme working conditions including cyclic fatigue loads at high altitude, continuous wind vibration, sharp temperature swings. Offshore wind turbines additionally face severe salt spray corrosion. The anti-fatigue, anti-loosening and long-term anti-corrosion performance of fasteners is essential for unit safety. NINGBO TOPBOLT METALWORKS CO., LTD. supplies dedicated fasteners for onshore towers, offshore wind monopiles, nacelles, blade roots and flange joints, supporting both inland wind farms and offshore wind developments.
Mainstream Wind Power Fasteners
Wind Tower Flange Studs
Standards: ASTM A193 B7, A320 L7
Core connectors for tower flange joints, clamping separate tower sections to withstand heavy cyclic loads. A320 L7 alloy steel is selected for low-temperature regions. Offshore variants adopt high-performance anti-corrosion coatings, with strict preload control to avoid fatigue failure under persistent wind vibration.
Multi-Jackbolt Tensioning Stud Assemblies
Standards: ISO 898-1
Commonly installed on nacelle frames, hubs and pitch bearings with limited working space. The multi-point tension design enables precise preload control and easy disassembly, widely used for wind turbine maintenance.
Belleville Spring Washers
Standards: DIN 2092
Special elastic components matched with studs. They compensate preload loss caused by temperature fluctuation and material creep, maintain stable compression on flange surfaces, and prevent flange gaps, mainly used on tower and pitch flanges.
Heavy Hex Tension Nuts for Hydraulic Tensioning
Standards: ASTM A194 2H, 8M
Engineered for hydraulic tensioning installation, with thicker wall and higher bearing capacity, matched with B7 / L7 studs. Offshore grades support passivation and zinc-flake coating against marine salt corrosion.
Blade Root Threaded Inserts
Standards: Custom drawings + ISO 898
Pre-embedded inside composite blade root structures, serving as threaded connection points between blades and hubs. They bear huge centrifugal force and alternating loads during rotation. Most inserts are custom manufactured according to project drawings.
Supply Overview
| Item | Details |
| Product Types | Wind Tower Flange Studs, Multi-Jackbolt Tensioning Stud Assemblies, Belleville Spring Washers, Heavy Hex Tension Nuts, Blade Root Threaded Inserts |
| Materials | Alloy Steel A193 B7 / A320 L7, Stainless Steel, High-strength Carbon Steel |
| Surface Finishes | Zinc-flake Coating, Dacromet, Passivation, PTFE Composite Coating |
| Standards | ASTM A193 B7 / A194 2H / A320 L7, DIN2092, ISO898-1 |
| Customization | Custom sizes per drawing, pre-assembled tension sets, MTC certificates and third-party test reports available |
Related Products
Wind Tower Flange Studs
Multi-Jackbolt Tensioning Stud Assemblies
Belleville Spring Washers
Heavy Hex Tension Nuts for Hydraulic Tensioning
Blade Root Threaded Inserts
Looking for Fasteners for Your Onshore & Offshore Wind Project?
TOPBOLT provides fastening solutions for wind tower flanges, nacelles and wind turbine blades. Share your drawings, material grade, anti-corrosion requirements, applicable standards and order quantity, our team will recommend fasteners engineered for wind fatigue conditions.
