What Is N45?
N45 offers approximately 7% more energy product than N42 at a modest cost premium. It is specified in high-torque servo motors, precision linear actuators, and Halbach arrays where packaging is tight and operating temperatures stay well below the thermal limit.
N45 Technical Specifications
| Remanence (Br) | 13.2–13.7 kGs (1.32–1.37 T) |
| Coercive Force (HcB) | ≥12.5 kOe (≥995 kA/m) |
| Intrinsic Coercivity (HcJ) | ≥12 kOe (≥955 kA/m) |
| Energy Product (BHmax) | 43–46 MGOe (342–366 kJ/m³) |
| Max Operating Temperature | 80°C |
| Temperature Coefficient (Br) | -0.12 %/°C |
| Temperature Coefficient (HcJ) | -0.60 %/°C |
| Density (typical) | 7.5 g/cm³ |
| Vickers Hardness (typical) | 550–650 HV |
Values per IEC 60404-5 / GB/T 13560. Actual production values fall within the range quoted; batch-specific BH-curve data is provided on every certificate of conformance.
Where N45 Is Used
N45 is specified across the following application categories. Each links to a full application brief with design requirements and recommended grade combinations.
Industrial Automation
NdFeB magnets for stepper motors, servo drives, linear actuators, magnetic couplings, and factory automation equipment across European and North American manufacturing.
Medical Devices
Precision NdFeB magnets for MRI equipment, surgical robotics, implantable devices, dental applications, and medical sensors — with the biocompatibility and traceability medical programs require.
Aerospace & Defense
High-temperature NdFeB magnets for aerospace actuators, flight-control servos, defense systems, and downhole tools — with the documentation, export licensing, and material verification these programs demand.
Recommended Coatings for N45
Coating choice is driven by operating environment and assembly method. For N45, the typical options are:
- •NiCuNi
- •Epoxy over NiCuNi
See our NdFeB Coatings Guide for a full comparison with salt spray data and decision framework.
Design Considerations When Specifying N45
- 01Not suitable for motor interiors that exceed 70°C under sustained load — step up to N45H or N45SH.
- 02Pairs well with thin-walled rings where every tenth of a mm of flux matters.
- 03Flux consistency is critical at this grade — 100% flux mapping on incoming batches is recommended.
Related Grades
Frequently Asked Questions
What is N45 NdFeB magnet?
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N45 offers approximately 7% more energy product than N42 at a modest cost premium. It is specified in high-torque servo motors, precision linear actuators, and Halbach arrays where packaging is tight and operating temperatures stay well below the thermal limit.
What is the maximum operating temperature of N45?
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N45 sintered NdFeB is rated for continuous operation up to 80°C. This is the practical upper limit before thermal demagnetization begins to affect performance. For a safety margin, design for a working temperature at least 20–30°C below the maximum rating.
What is the BHmax of N45?
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N45 delivers an energy product (BHmax) in the range of 43–46 MGOe (342–366 kJ/m³). This is the maximum magnetic energy density the grade can produce, measured according to standard IEC 60404-5 magnetic testing.
What applications use N45 magnets?
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N45 is typically specified for Industrial Automation, Medical Devices, Aerospace & Defense. The grade's combination of 43–46 MGOe (342–366 kJ/m³) energy product and 80°C maximum service temperature determines its fit for any given motor or actuator design.
Request a Quote for N45 Magnets
Factory-direct supply from Mainrich International. IATF 16949 certified, EU-office support from London, 97% on-time delivery. Share your dimensions, quantity, and target application — we will quote within two business days.