What Is N45H?
N45H delivers stronger flux than N42H at the same 120°C rating, making it the go-to grade for compact EV auxiliary motors and high-efficiency industrial servos. Its balance of BHmax and HcJ suits designs where packaging dictates grade and thermal derating must stay controlled.
N45H 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) | ≥17 kOe (≥1353 kA/m) |
| Energy Product (BHmax) | 43–46 MGOe (342–366 kJ/m³) |
| Max Operating Temperature | 120°C |
| Temperature Coefficient (Br) | -0.12 %/°C |
| Temperature Coefficient (HcJ) | -0.55 %/°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 N45H Is Used
N45H is specified across the following application categories. Each links to a full application brief with design requirements and recommended grade combinations.
Recommended Coatings for N45H
Coating choice is driven by operating environment and assembly method. For N45H, 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 N45H
- 01Sweet spot for compact European automotive BLDC designs — widely qualified across Tier 1 portfolios.
- 02GBD-processed N45H offers strong total cost of ownership vs. standard-production equivalents.
- 03For 140°C+ environments, step to N45SH or N45UH.
Related Grades
↑ Higher temperature rating
N45SH (150°C)
↓ Lower temperature, lower cost
N45 (80°C)
Same family · High Temperature (H)
N38H · 36–39 MGOe (287–310 kJ/m³)
Same family · High Temperature (H)
N42H · 40–43 MGOe (318–342 kJ/m³)
Same family · High Temperature (H)
N48H · 45–48 MGOe (358–382 kJ/m³)
Same family · High Temperature (H)
N50H · 47–50 MGOe (374–398 kJ/m³)
Frequently Asked Questions
What is N45H NdFeB magnet?
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N45H delivers stronger flux than N42H at the same 120°C rating, making it the go-to grade for compact EV auxiliary motors and high-efficiency industrial servos. Its balance of BHmax and HcJ suits designs where packaging dictates grade and thermal derating must stay controlled.
What is the maximum operating temperature of N45H?
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N45H sintered NdFeB is rated for continuous operation up to 120°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 N45H?
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N45H 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 N45H magnets?
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N45H is typically specified for EV Motors. The grade's combination of 43–46 MGOe (342–366 kJ/m³) energy product and 120°C maximum service temperature determines its fit for any given motor or actuator design.
Request a Quote for N45H Magnets
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