FAG shaft nuts are high-precision locking components designed to secure bearings onto shafts with maximum reliability. Manufactured by Schaeffler Group, these nuts ensure axial fixation, prevent loosening under vibration, and maintain optimal preload in critical applications such as wind turbines, industrial gearboxes, and heavy machinery.
Key Benefits of FAG Shaft Nuts
✔ High Torque Retention – Resists vibration-induced loosening
✔ Precision Threading – Ensures uniform load distribution
✔ Corrosion Resistance – Special coatings for harsh environments
✔ Easy Installation & Removal – Compatible with hydraulic tools
✔ Wide Range of Sizes – M10 to M300+ thread diameters
Technical Specifications & Product Range
- Standard Shaft Nuts (FAG AZ Series)
Material: 42CrMo4 alloy steel (hardened & tempered)
Thread Standards: Metric (M), UNC, UNF, ACME
Locking Mechanism:
Deformation slots (DIN 981 compliant)
Locking plates (DIN 5406)
Torque Capacity: 25–6,000 Nm (depending on size)
- High-Performance Locknuts (FAG AZX Series)
Reinforced Design – 30% higher clamping force
DynaGrip™ Thread Technology – Prevents self-loosening under vibration
Applications: Wind turbine main shafts, mining crushers
- Corrosion-Resistant Nuts (FAG AZK Series – Stainless Steel)
Material: AISI 316L / AISI 304
Salt Spray Resistance: 1,000+ hours (ISO 9227)
Ideal for: Marine, chemical, and food processing industries
- Hydraulic Tightening Nuts (FAG HSN Series)
Integrated Hydraulic Ports – Allows 1,000 bar pressure-assisted tightening
Benefits:
80% faster installation
Eliminates uneven preload
Common in: Large gearboxes, steel rolling mills
Engineering Innovations
- Anti-Loosening Technology
Dual-Deformation Locking – Two-stage slot deformation for zero creep
Torque Stripe Indicators – Visual confirmation of proper tightening
- Advanced Coatings
Zinc-Nickel Plating (CorroProtect™) – 2,000-hr salt spray resistance
Durotect® TD Coating – Reduces thread galling by 90%
- Smart Nuts (IoT-Enabled)
Embedded RFID Tags – Store installation torque & maintenance history
FAG SmartCheck System – Wireless load monitoring
Installation & Maintenance Guidelines
✔ Mounting Best Practices
Clean Shaft Threads – Use FAG SOLV-9 degreaser
Apply Lubricant – FAG Arcanol L74 (anti-seize properties)
Torque Tightening – Follow FAG TorqueTable™ (ISO 16047)
Secure Locking Plate – Bend tabs into nut slots
✔ Maintenance Tips
Re-torque Check – After first 50 operating hours
Replacement Indicators:
Thread deformation > 0.1mm
Corrosion pitting > 5% surface area
Why Choose FAG Shaft Nuts?
✅ Schaeffler Precision – ISO 9001 & API 670 compliant
✅ Vibration Resistance – DynaGrip™ outperforms standard nuts 5:1 in shake tests
✅ Global Inventory – 24/7 availability through Schaeffler hubs
✅ Custom Solutions – OEM-specific threading & coatings
Conclusion: The Gold Standard in Shaft Retention
FAG shaft nuts transform bearing fixation from a maintenance concern into a reliability asset. By combining military-grade materials, smart monitoring options, and hydraulic-assist technology, they deliver:
50% longer bearing life through stable preload
90% reduction in unplanned downtime
Full traceability via RFID/SmartCheck systems
Specify FAG Shaft Nuts Today—Where Absolute Security Meets German Engineering.
