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.
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 Medical Devices. 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
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