Key Takeaways
- ◆N52 delivers 48–53 MGOe BHmax; N48 delivers 45–48 MGOe — approximately 10–15% more energy product at equivalent volume.
- ◆N48 is rated to 80°C max operating temperature; N52 is rated to 65°C — use N48 if your design runs hotter.
- ◆Both have intrinsic coercivity ≥11 kOe at 20°C — limited margin against demagnetizing fields, which is the real design risk at these grades.
- ◆For motor applications above 65°C, skip both and go to N48H or N48SH — standard-series grades are not motor magnets except for intermittent duty.
- ◆N52 production is concentrated in a small number of qualified factories — lead time and pricing variability is higher than N48.
Overview
N48 and N52 sit at the top of the standard-series NdFeB grade spectrum. Both are specified where maximum flux in a minimum volume is paramount and the operating temperature is low. The primary difference is BHmax — N52 offers roughly 10–15% more energy product — but this comes with a tighter temperature envelope and production-capacity constraints. Many buyers over-specify N52 for applications where N48SH (with GBD processing) would be both thermally safer and more economically sensible.
Side-by-Side Comparison
| Criterion | N48 | N52 |
|---|---|---|
| Remanence (Br) | 13.7–14.1 kGs | ✓14.2–14.8 kGs |
| Energy Product (BHmax) | 45–48 MGOe | ✓48–53 MGOe |
| Coercive Force (HcB min) | ✓≥12.5 kOe | ≥11.5 kOe |
| Intrinsic Coercivity (HcJ min) | ≥11 kOe | ≥11 kOe |
| Max Operating Temperature | ✓80°C | 65°C |
| Temperature Coefficient Br | -0.12%/°C | -0.12%/°C |
| Typical Cost | ✓Lower | 10–20% premium |
| Global Production Capacity | ✓Broad | Limited |
Green tick indicates the better option for the criterion. Winner assignment reflects typical engineering practice; your application may weight criteria differently.
When N48 Is the Right Choice
- •Operating temperature above 65°C but under 80°C
- •Cost sensitivity matters more than marginal flux gain
- •Production volume is high and supply capacity matters
- •Design has moderate flux-density requirements
When N52 Is the Right Choice
- •Absolute minimum package volume is the dominant design constraint
- •Operating temperature stays well below 65°C continuously
- •Application values 10–15% flux gain enough to justify cost premium
- •Not a motor — N52 is a poor motor-magnet choice; use for sensors, speakers, Halbach arrays, scientific instruments
Decision Framework
Start with operating temperature. If sustained internal temperature exceeds 65°C, N48 is the answer — N52's temperature margin is simply not there. If temperature is well-controlled and package size drives design, N52's BHmax advantage is real. But a common better answer in both cases is N48SH with GBD processing: delivers N48-class BHmax at 150°C rating, and GBD makes the cost competitive with standard N48 production.
Related NdFeB Grades
N48
80°CPremium sintered NdFeB grade for compact, high-energy-density motor and actuator designs.
N52
65°CHighest commercial energy product NdFeB grade — specify only where size-over-temperature trade-off matters most.
N48H
120°CPremium high-temperature NdFeB grade for the most power-dense motors running up to 120°C.
N48SH
150°CPremium SH-grade NdFeB — the gold-standard magnet for high-performance EV and robotics motor rotors.
Frequently Asked Questions
Is N52 stronger than N48?
+
Yes, N52 delivers approximately 10–15% higher energy product (BHmax) than N48. N52 ranges 48–53 MGOe, N48 ranges 45–48 MGOe. At equivalent volume, N52 produces more magnetic flux. However, N52 is rated to only 65°C max operating temperature vs 80°C for N48 — the flux advantage disappears if your application runs hot.
What is the maximum temperature for N52 magnets?
+
N52 sintered NdFeB is rated for 65°C maximum continuous operating temperature. Above this, thermal demagnetization becomes significant and irreversible. This low temperature rating is why N52 is rarely the correct choice for motors — motor interiors routinely reach 80–120°C even in well-cooled designs.
Should I use N52 instead of N48 for my motor?
+
Generally no. Motor internal temperatures typically exceed N52's 65°C rating, causing demagnetization over time. For motor applications, N48H (120°C rated) or N48SH (150°C rated, preferably with GBD processing) are almost always better choices than either N48 or N52. Reserve standard N48 and N52 for non-motor applications like speakers, sensors, and scientific instruments.
How much more expensive is N52 than N48?
+
N52 typically carries a 10–20% price premium over N48 at 2026 pricing. The premium reflects both higher material purity requirements and concentrated production capacity — fewer factories worldwide can reliably produce N52 to spec. Lead times are also typically longer for N52 orders.
Need help deciding?
Share your application requirements and our engineering team will recommend the correct specification with real design margin. Human response within 1 business day.