What Is N42SH?
N42SH is the single most common high-temperature NdFeB grade specified in European EV and robotics programmes. It delivers the 150°C rating required for traction-motor duty cycles while preserving a strong energy product, making it the default for PMSM and BLDC rotors across automotive Tier 1 and Tier 2 programs.
N42SH 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) | ≥20 kOe (≥1592 kA/m) |
| Energy Product (BHmax) | 40–43 MGOe (318–342 kJ/m³) |
| Max Operating Temperature | 150°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 N42SH Is Used
N42SH 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.
Robotics
Radial multi-pole rings, joint-motor magnets, and high-torque servo-motor assemblies for humanoid robots, collaborative robots, and industrial robotic systems.
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 N42SH
Coating choice is driven by operating environment and assembly method. For N42SH, 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 N42SH
- 01Default grade for European automotive and robotics BLDC motor programs.
- 02GBD-processed N42SH offers the best cost-performance in this temperature class.
- 03Full BH-curve testing at working temperature should be part of supplier qualification.
Related Grades
↑ Higher temperature rating
N42UH (180°C)
↓ Lower temperature, lower cost
N42H (120°C)
Same family · Super High Temperature (SH)
N38SH · 36–39 MGOe (287–310 kJ/m³)
Same family · Super High Temperature (SH)
N45SH · 43–46 MGOe (342–366 kJ/m³)
Same family · Super High Temperature (SH)
N48SH · 45–48 MGOe (358–382 kJ/m³)
Frequently Asked Questions
What is N42SH NdFeB magnet?
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N42SH is the single most common high-temperature NdFeB grade specified in European EV and robotics programmes. It delivers the 150°C rating required for traction-motor duty cycles while preserving a strong energy product, making it the default for PMSM and BLDC rotors across automotive Tier 1 and Tier 2 programs.
What is the maximum operating temperature of N42SH?
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N42SH sintered NdFeB is rated for continuous operation up to 150°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 N42SH?
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N42SH 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 N42SH magnets?
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N42SH is typically specified for EV Motors, Robotics, Industrial Automation. The grade's combination of 40–43 MGOe (318–342 kJ/m³) energy product and 150°C maximum service temperature determines its fit for any given motor or actuator design.
Request a Quote for N42SH 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.