What Is N42H?
N42H combines strong energy product with the thermal stability needed for continuous-duty motors. It is the default choice across European Tier 1 automotive suppliers for BLDC and PMSM motors in auxiliary systems — fuel pumps, cooling fans, water pumps, EPS assist.
N42H 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) | ≥17 kOe (≥1353 kA/m) |
| Energy Product (BHmax) | 40–43 MGOe (318–342 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 N42H Is Used
N42H 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.
Industrial Automation
NdFeB magnets for stepper motors, servo drives, linear actuators, magnetic couplings, and factory automation equipment across European and North American manufacturing.
Recommended Coatings for N42H
Coating choice is driven by operating environment and assembly method. For N42H, 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 N42H
- 01Verify that Dy/Tb content complies with your end customer's ESG and traceability requirements.
- 02Ideal candidate for GBD processing — reduces HREE use while maintaining 120°C rating.
- 03For hot motor interiors (above 110°C sustained), step up to N42SH for real thermal headroom.
Related Grades
↑ Higher temperature rating
N42SH (150°C)
↓ Lower temperature, lower cost
N42 (80°C)
Same family · High Temperature (H)
N38H · 36–39 MGOe (287–310 kJ/m³)
Same family · High Temperature (H)
N45H · 43–46 MGOe (342–366 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 N42H NdFeB magnet?
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N42H combines strong energy product with the thermal stability needed for continuous-duty motors. It is the default choice across European Tier 1 automotive suppliers for BLDC and PMSM motors in auxiliary systems — fuel pumps, cooling fans, water pumps, EPS assist.
What is the maximum operating temperature of N42H?
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N42H 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 N42H?
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N42H 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 N42H magnets?
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N42H is typically specified for EV Motors, Industrial Automation. The grade's combination of 40–43 MGOe (318–342 kJ/m³) energy product and 120°C maximum service temperature determines its fit for any given motor or actuator design.
Request a Quote for N42H 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.