Magnet Material Grades

Choosing the right magnet material determines how small, efficient, and reliable your design can be. Material choice sets your margin against heat, corrosion, and demagnetization—the wrong pick risks torque fade in motors, drift in sensors, and shortened life in harsh or sterilized environments. Engineers most often rely on Neodymium (NdFeB) for maximum energy density in tight envelopes and Samarium Cobalt (SmCo) for superior thermal stability and inherent corrosion resistance.

We stock neodymium magnets and samarium cobalt magnets to cover common prototyping needs and small production. Below we list stock magnet materials specifications. For full datasets—including demag curves—download the materials specifications below.

Neodymium (NdFeB) — Stock Grades

Neodymium grades N35 to N52 (typical property ranges).
NdFeB Grade	Remanence Br T (kGs)	Coercive Force H_cB kA/m (kOe)	Intrinsic H_cJ kA/m (kOe)	Max Energy (BH)_max kJ/m³ (MGOe)	Working Temp °C	Density g/cm³
N35	1.17–1.22 (11.7–12.2)	≥868 (≥10.9)	≥955 (≥12)	263–287 (33–36)	≤80	≥7.5
N38	1.22–1.26 (12.2–12.6)	≥899 (≥11.3)	≥955 (≥12)	287–310 (36–39)	≤80	≥7.5
N40	1.26–1.29 (12.6–12.9)	≥907 (≥11.4)	≥955 (≥12)	302–326 (38–41)	≤80	≥7.5
N42	1.29–1.33 (12.9–13.3)	≥915 (≥11.5)	≥955 (≥12)	318–342 (40–43)	≤80	≥7.5
N45	1.32–1.38 (13.2–13.8)	≥915 (≥11.5)	≥955 (≥12)	342–366 (43–46)	≤80	≥7.5
N48	1.37–1.42 (13.7–14.2)	≥876 (≥11.0)	≥955 (≥12)	366–390 (46–49)	≤80	≥7.5
N50	1.40–1.45 (14.0–14.5)	≥836 (≥10.5)	≥955 (≥12)	374–406 (47–51)	≤80	≥7.5
N52	1.42–1.48 (14.2–14.8)	≥836 (≥10.5)	≥955 (≥12)	390–422 (49–53)	≤80	≥7.5

Select Grade

NdFeB

Grade —

Remanence Br T (kGs)

—

Coercive Force H_cB kA/m (kOe)

—

Intrinsic H_cJ kA/m (kOe)

—

Max Energy (BH)_max kJ/m³ (MGOe)

—

Working Temp °C

—

Density g/cm³

—

Download Full NdFeB Materials Specs (PDF)

Shop Neodymium Magnets Strongest magnetic performance for compact designs.

Request a Custom Magnet Need a unique grade, tolerance, or assembly? Get a quote.

Contact Engineering Support Talk to our engineers about material selection and design.

Specifications provided by SM Magnetics, our engineering and custom solutions division.

Samarium Cobalt (SmCo) — Stock Grades

Samarium Cobalt grades (typical property ranges).
SmCo Grade	Remanence Br T (kGs)	Coercive Force H_cB kA/m (kOe)	Intrinsic H_cJ kA/m (kOe)	Max Energy (BH)_max kJ/m³ (MGOe)	Working Temp °C	Density g/cm³
SmCo 26	1.02–1.05 (10.2–10.5)	748–796 (9.4–10.0)	≥1433 (≥18)	191–207 (24–26)	≤300	8.4
SmCo 30	1.08–1.10 (10.8–11.0)	788–835 (9.9–10.5)	≥1433 (≥18)	220–240 (28–30)	≤300	8.4
SmCo 24H	0.95–1.02 (9.5–10.2)	692–764 (8.7–9.6)	≥1990 (≥25)	175–191 (22–24)	≤350	8.4

Select Grade

SmCo

Grade —

Remanence Br T (kGs)

—

Coercive Force H_cB kA/m (kOe)

—

Intrinsic H_cJ kA/m (kOe)

—

Max Energy (BH)_max kJ/m³ (MGOe)

—

Working Temp °C

—

Density g/cm³

—

Download Full SmCo Materials Specs (PDF)

Shop Samarium Cobalt Magnets High-temperature stability with excellent corrosion resistance.

Request a Custom Magnet Need a unique grade, thickness, or stack? Get a quote.

Contact Engineering Support Talk to our engineers about material selection and solutions.

Specifications provided by SM Magnetics, our engineering and custom solutions division.