What Is N42UH?
N42UH combines 180°C service temperature with a strong energy product, making it the correct grade for premium EV traction motors operating at continuous high load, aerospace actuators, and industrial machines with demanding thermal envelopes. Production is limited and strongly benefits from GBD processing.
N42UH Technical Specifications
| Remanence (Br) | 12.9–13.3 kGs (1.29–1.33 T) |
| Coercive Force (HcB) | ≥11.9 kOe (≥947 kA/m) |
| Intrinsic Coercivity (HcJ) | ≥25 kOe (≥1990 kA/m) |
| Energy Product (BHmax) | 40–43 MGOe (318–342 kJ/m³) |
| Max Operating Temperature | 180°C |
| Temperature Coefficient (Br) | -0.12 %/°C |
| Temperature Coefficient (HcJ) | -0.50 %/°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 N42UH Is Used
N42UH is specified across the following application categories. Each links to a full application brief with design requirements and recommended grade combinations.
EV Motors
High-performance NdFeB magnets for electric vehicle traction motors, auxiliary drives, and e-axle systems — with the temperature stability and flux density required for continuous high-torque service.
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.
Robotics
Radial multi-pole rings, joint-motor magnets, and high-torque servo-motor assemblies for humanoid robots, collaborative robots, and industrial robotic systems.
Recommended Coatings for N42UH
Coating choice is driven by operating environment and assembly method. For N42UH, 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 N42UH
- 01One of the most sought-after automotive traction grades — secure capacity early.
- 02GBD processing is effectively standard at this temperature class.
- 03Full BH-curve data at 180°C should be part of every batch's certificate of conformance.
Related Grades
Frequently Asked Questions
What is N42UH NdFeB magnet?
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N42UH combines 180°C service temperature with a strong energy product, making it the correct grade for premium EV traction motors operating at continuous high load, aerospace actuators, and industrial machines with demanding thermal envelopes. Production is limited and strongly benefits from GBD processing.
What is the maximum operating temperature of N42UH?
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N42UH sintered NdFeB is rated for continuous operation up to 180°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 N42UH?
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N42UH delivers an energy product (BHmax) in the range of 40–43 MGOe (318–342 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 N42UH magnets?
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N42UH is typically specified for EV Motors, Aerospace & Defense, Robotics. The grade's combination of 40–43 MGOe (318–342 kJ/m³) energy product and 180°C maximum service temperature determines its fit for any given motor or actuator design.
Request a Quote for N42UH 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.