Key takeaways
- N35: 33–36 MGOe (263–287 kJ/m³); N42: 40–43 MGOe (318–342 kJ/m³), at 20°C.
- N35 HcJ: ≥12 kOe (≥955 kA/m); N42 HcJ: ≥12 kOe (≥955 kA/m), at 20°C.
- The class temperature is a screening reference. Safe operation requires the material’s hot demagnetization curves, load line, opposing field and duty cycle.
- BHmax is energy product. Differences do not give a fixed change in field, pull force, torque or required magnet volume.
- Price and lead time require comparable quotations for the same geometry, coating, quantity and acceptance plan.
Overview
Overview
N35 and N42 are sintered NdFeB reference grades. Their listed energy-product ranges differ at 20°C. Compare remanence and intrinsic coercivity separately. These values describe the educational table; supplier specifications can differ. A design calculation or test is needed to compare output in the complete magnetic circuit.
Side-by-side
Side-by-Side Comparison
Reference properties and design questions. A count of comparison points does not establish a material or supplier recommendation.
| Criterion | N35 | N42 |
|---|---|---|
| BHmax at 20°C | 33–36 MGOe (263–287 kJ/m³) | 40–43 MGOe (318–342 kJ/m³) |
| Br at 20°C | 11.7–12.1 kGs (1.17–1.21 T) | 12.9–13.2 kGs (1.29–1.32 T) |
| HcJ minimum at 20°C | ≥12 kOe (≥955 kA/m) | ≥12 kOe (≥955 kA/m) |
| Nominal temperature class | 80°C; geometry and load dependent | 80°C; geometry and load dependent |
| Hot performance | Requires the proposed material’s hot curves | Requires the proposed material’s hot curves |
| Chemistry and processing | Confirm composition and route | Confirm composition and route |
| Price and availability | Quote for the actual part | Quote for the actual part |
Confirm source conditions and the actual part requirements before using reference values as acceptance limits.
Use cases
Conditions for considering each option
When N35 wins
- The N35 material meets the field and demagnetization requirements in the validated design.
- Its part quotation and qualification plan fit the programme.
When N42 wins
- The N42 material meets a requirement that the evaluated N35 material does not.
- The measured benefit justifies any difference in part cost or qualification work.
How to choose
Decision Framework
Decision framework
Compare hot B-H and J-H curves at the worst working point, including faults and transient temperature. Then calculate or test output in the actual geometry. N35 and N42 cannot be selected from the class temperature alone. Agree coating, acceptance tests and production route before comparing quotations.
Specs
Related NdFeB Grades
N35
80°C classN35 reference: 33–36 MGOe at 20°C, with a nominal 80°C temperature class.
Reference; drawing review required
N38
80°C classN38 reference: 36–39 MGOe at 20°C, with a nominal 80°C temperature class.
Reference; drawing review required
N40
80°C classN40 reference: 38–41 MGOe at 20°C, with a nominal 80°C temperature class.
Reference; drawing review required
N42
80°C classN42 reference: 40–43 MGOe at 20°C, with a nominal 80°C temperature class.
Reference; drawing review required
Industries
Related Applications
EV Motors
NdFeB magnet design inputs for permanent-magnet traction motors, auxiliary drives and e-axles.
Robotics
NdFeB design inputs for robot joint motors, compact actuators and servo drives.
Industrial Automation
NdFeB magnets for stepper motors, servo drives, linear actuators, magnetic couplings, and factory automation equipment across European and North American manufacturing.
Questions
Frequently Asked Questions
What is the difference between N35 and N42?
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N35 lists 33–36 MGOe (263–287 kJ/m³) and HcJ ≥12 kOe (≥955 kA/m); N42 lists 40–43 MGOe (318–342 kJ/m³) and HcJ ≥12 kOe (≥955 kA/m). These are reference values at 20°C. The numeric grade describes energy product, while a suffix distinguishes a coercivity class.
Which grade should I use in a motor?
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Assess the local operating point using hot material curves, including opposing fields and transient duty. Room-temperature BHmax and a nominal class temperature cannot guarantee motor output or demagnetization margin.
How do I compare cost?
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Request prices for the same dimensions, coating, quantity, test requirements and delivery terms. A fixed grade-price percentage is not a reliable basis for a new quotation.
Does the suffix establish export licensing?
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A grade suffix does not determine chemistry or licensing. Obtain the actual composition and product description, then have the exporter confirm classification and transaction requirements under current rules.
Does N35 have higher-temperature variants?
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Yes. Arnold’s published NdFeB catalogue includes N35H, N35SH and other N35 coercivity classes. Their existence does not establish Mainrich supply of any specific geometry or series.
Need help deciding?
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