What Is N42?
N42 is one of the most commonly specified NdFeB grades worldwide. It delivers a strong BHmax for its temperature class and is the default choice for BLDC motors, magnetic separators, medical devices, and wind generator prototypes when operating temperatures stay at or below 80°C.
N42 Technical Specifications
| Remanence (Br) | 12.9–13.2 kGs (1.29–1.32 T) |
| Coercive Force (HcB) | ≥11.8 kOe (≥939 kA/m) |
| Intrinsic Coercivity (HcJ) | ≥12 kOe (≥955 kA/m) |
| Energy Product (BHmax) | 40–43 MGOe (318–342 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 N42 Is Used
N42 is specified across the following application categories. Each links to a full application brief with design requirements and recommended grade combinations.
Recommended Coatings for N42
Coating choice is driven by operating environment and assembly method. For N42, the typical options are:
- •NiCuNi
- •Epoxy over NiCuNi
- •Parylene (medical)
See our NdFeB Coatings Guide for a full comparison with salt spray data and decision framework.
Design Considerations When Specifying N42
- 01Most common European OEM default for room-temperature BLDC applications.
- 02If your motor internal temperature approaches 70°C under load, jump to N42H for reliable thermal margin.
- 03Demand batch-level BH-curve testing — variance between suppliers on N42 is unusually high due to its popularity.
Related Grades
Frequently Asked Questions
What is N42 NdFeB magnet?
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N42 is one of the most commonly specified NdFeB grades worldwide. It delivers a strong BHmax for its temperature class and is the default choice for BLDC motors, magnetic separators, medical devices, and wind generator prototypes when operating temperatures stay at or below 80°C.
What is the maximum operating temperature of N42?
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N42 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 N42?
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N42 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 N42 magnets?
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N42 is typically specified for Industrial Automation. The grade's combination of 40–43 MGOe (318–342 kJ/m³) energy product and 80°C maximum service temperature determines its fit for any given motor or actuator design.
Request a Quote for N42 Magnets
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