Technical Data
N42EH Technical Specifications
| Parameter | Value |
|---|---|
| Remanence (Br) at 20°C | 12.9–13.3 kGs (1.29–1.33 T) |
| Coercive Force (HcB) at 20°C | ≥11.9 kOe (≥947 kA/m) |
| Intrinsic Coercivity (HcJ) at 20°C | ≥30 kOe (≥2388 kA/m) |
| Energy Product (BHmax) at 20°C | 40–43 MGOe (318–342 kJ/m³) |
| Nominal temperature class | 200°C |
| Approximate coefficient (Br) | -0.12 %/°C |
| Approximate coefficient (HcJ) | -0.45 %/°C |
| Density (typical) | 7.5 g/cm³ |
| Vickers Hardness (typical) | 550–650 HV |
Br, HcB, HcJ and BHmax are educational reference values at 20°C. Supplier specifications vary; agree the quoted material and acceptance limits separately. Temperature coefficients are approximate reference values, not a substitute for measured hot curves. Agree any batch measurements and certificate contents in the order specification.
Overview
What Is N42EH?
N42EH is a sintered NdFeB grade in the Extreme High Temperature (EH) family. This reference lists 12.9–13.3 kGs (1.29–1.33 T) remanence and ≥30 kOe (≥2388 kA/m) intrinsic coercivity at 20°C. The numeric grade describes energy product; the EH designation does not identify alloy composition or establish a safe operating point.
Applications
Related application design topics
These briefs describe design inputs and qualification questions. They do not confirm this grade for a particular application or geometry.
Surface Protection
Coating candidates for N42EH
Coating choice is driven by operating environment and assembly method. Qualify the finished coating stack for the actual part:
See our NdFeB Coatings Guide for coating definitions and qualification considerations.
Specifying
Design Considerations When Specifying N42EH
Key insight
The 200°C class is a preliminary screening value. Check the actual material's hot demagnetization curves against the load line, opposing field and duty cycle.
FAQ
Frequently Asked Questions
What is N42EH NdFeB magnet?
+
N42EH is a sintered NdFeB grade in the Extreme High Temperature (EH) family. This reference lists 12.9–13.3 kGs (1.29–1.33 T) remanence and ≥30 kOe (≥2388 kA/m) intrinsic coercivity at 20°C. The numeric grade describes energy product; the EH designation does not identify alloy composition or establish a safe operating point.
What is the maximum operating temperature of N42EH?
+
N42EH has a nominal 200°C class in this reference. Nominal temperature classes do not establish a safe operating temperature. Geometry, hot curves, load line, opposing field and duty cycle must be assessed for the actual part.
What is the BHmax of N42EH?
+
N42EH has a reference BHmax range of 40–43 MGOe (318–342 kJ/m³) at 20°C. BHmax is the maximum B × H product on the normal demagnetization curve. It does not specify hot output, surface field or pull force. Supplier acceptance values require a material-specific sheet or test record.
What applications use N42EH magnets?
+
Related design topics include Industrial Automation, EV Motors. These links are educational examples. Grade suitability requires the actual geometry, hot curves, load line, opposing field and duty cycle; the reference properties alone cannot establish it.
Request a drawing review for N42EH
Mainrich’s company range is N30 to N56. Grade, series, geometry and temperature must be confirmed together. Share your drawing, quantity and operating conditions for review.