Technical Data
N42 Technical Specifications
| Parameter | Value |
|---|---|
| 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.
Overview
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.
Applications
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.
Industrial Automation
NdFeB magnets for stepper motors, servo drives, linear actuators, magnetic couplings, and factory automation equipment across European and North American manufacturing.
Medical Devices
Precision NdFeB magnets for MRI equipment, surgical robotics, implantable devices, dental applications, and medical sensors, with the biocompatibility and traceability medical programs require.
Surface Protection
Recommended Coatings for N42
Coating choice is driven by operating environment and assembly method. For N42, the typical options are:
See our NdFeB Coatings Guide for a full comparison with salt spray data and decision framework.
Specifying
Design Considerations When Specifying N42
Key insight
Most common European OEM default for room-temperature BLDC applications.
FAQ
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, Medical Devices. 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.
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