Wind Power Station Bolts

 

 

Wind power station bolts are ultra-high-strength, high-toughness special fasteners engineered exclusively for wind turbine equipment and wind farm infrastructure, adapting to the harsh working conditions of wind power projects (high altitude, offshore, strong wind vibration, extreme temperature difference). Compliant with national wind power industry standards and international fastener specifications, these bolts are the core connection components for wind turbine towers, nacelles, hubs, blades, and foundation structures. They feature excellent fatigue resistance, anti-loosening performance, and corrosion resistance, ensuring the long-term stable and safe operation of wind power equipment (design service life ≥20 years) under continuous dynamic load, strong wind impact and complex environmental conditions.

 

 

• Ultra-high strength & high toughness: Adopt high-grade alloy steel with precise quenching-tempering heat treatment; balance ultra-high tensile/yield strength with excellent impact toughness, resistant to repeated dynamic load and wind vibration fatigue.
• Superior fatigue resistance: Precision thread rolling (instead of tapping) and stress relief treatment, eliminate thread stress concentration; meet the wind power industry's strict fatigue test standards (≥2×10⁶ load cycles).
• Enhanced corrosion protection: Multi-layer anti-corrosion surface treatment (e.g., H.D.G + sealing, zinc-aluminum alloy plating) for onshore wind farms; duplex stainless steel + Dacromet for offshore/coastal wind farms, resistant to salt spray, humidity and atmospheric corrosion.
• Anti-loosening design: Special thread tolerance matching, serrated flange base, and pre-applied anti-seize lubricant; paired with high-strength lock nuts/wedge washers, effectively preventing loosening under long-term strong vibration.
• Large-spec & heavy-duty customization: Support over-length (≤2000mm), large-diameter (≤M100) and heavy hex structural bolt customization, adapted to the heavy-load connection of wind turbine towers and nacelles.
• Strict dimensional accuracy: High-precision machining for bolt head, shank and thread; strict control of perpendicularity, coaxiality and torque matching, ensuring uniform load distribution of connection nodes.

 

 

 

Property Class	Minimum Tensile Strength	Minimum Yield Strength	Impact Toughness (Akv, -20℃)	Hardness Range	Fatigue Resistance
10.9 (42CrMo)	≥1040 MPa	≥940 MPa	≥30 J	32–39 HRC	≥2×10⁶ load cycles
12.9 (40CrNiMoA)	≥1220 MPa	≥1100 MPa	≥35 J	39–44 HRC	≥3×10⁶ load cycles
2205 Duplex Stainless Steel	≥800 MPa	≥550 MPa	≥40 J	≤32 HRC	Resistant to salt spray fatigue

 

 

 

 

 

Core Certifications

Compliant with wind power industry standards: GB/T 3098.1, DL/T 1544 (China Wind Power), DIN 6914 (European Wind Power), ASTM A490 (American Wind Power).

International quality system certification: ISO9001:2015, IATF16949:2016, ISO14001 (environmental management), ISO45001 (occupational health).

Special testing certification: Wind power fatigue test, salt spray corrosion test (≥1000h), low-temperature impact test (-40℃), torque matching test.

 

Strict Quality Control

1. Raw Material Traceability: All alloy steel raw materials are sourced from qualified large steel mills, with complete material certificates and batch traceability.
2. 100% Performance Testing: Each batch of bolts undergoes tensile, yield, hardness, impact and thread precision testing; fatigue and corrosion tests are conducted for sampling according to wind power industry requirements.
3. Full Process Inspection: Strict inspection of heat treatment, surface treatment, machining and assembly processes; ensure the anti-corrosion coating thickness, thread tolerance and torque matching meet the design requirements.
4. Factory Acceptance Test (FAT): Provide factory inspection reports and test data for each order; support customer on-site inspection and sampling testing before delivery.

 

 

 

Packaging

• Special Anti-Rust Packaging: Sealed vacuum anti-rust bags + foam lining (for precision bolts) + wooden crates/steel frames (for large-diameter over-length bolts); the surface is covered with anti-collision and waterproof materials.
• Labeling Requirements: Each package is marked with bolt specification, grade, application position, batch number and wind farm project number for easy on-site identification and management.
• Bulk Packaging: Wooden pallets with anti-rust film wrapping for on-site construction bolts; equipped with special storage boxes to prevent loss and damage.

 

Logistics

• Customized Transportation Scheme: Large-diameter over-length tower/foundation bolts use special heavy cargo transportation vehicles with fixed supports to avoid bending; offshore wind power bolts use sea-air combined transportation with strict anti-corrosion protection during transportation.
• Project-Based Delivery: According to the construction progress of wind farms, phased delivery is supported to ensure on-site material supply and avoid inventory backlog.
• Global Shipping: Support FOB/CIF/EXW/DDP transportation terms; professional logistics team is responsible for customs clearance and on-site delivery for overseas wind power projects.

 

After-Sales Service

• On-Site Technical Guidance: Send professional technical engineers to the wind farm construction site to guide bolt installation, torque calibration and quality inspection.
• Long-Term Spare Parts Supply: Establish project product archives; provide long-term supply of matching spare bolts for wind farms during the 20-year service life.
• Fault Handling: Respond to quality problems within 24 hours; send personnel to the site for handling for onshore wind farms, and coordinate overseas after-sales partners for offshore/overseas wind farms.
• Lifetime Technical Consultation: Provide permanent technical consultation for wind farm operation and maintenance, including bolt maintenance, torque recheck and corrosion protection suggestions.

Main Sales Markets: Global wind power core markets including China, Europe (Germany, Denmark, Spain), North America (USA, Canada), Southeast Asia, and the Middle East; cooperating with major wind turbine manufacturers and wind farm construction enterprises.

 

 

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