Technical data

Magnetic properties of NdFeB magnets.

Reference values for the grades listed in the Rare Earth Magnetics catalogue. Select the appropriate grade with operating temperature and application conditions in mind.

Precision rectangular NdFeB block magnet

9grades compared
N30–N52

Grade comparison
Grade	Remanence Br (mT)	Coercivity Hcb (kA/m)	Intrinsic Hcj (kA/m)	Energy product (MGOe)	Max. operating temp.
N30	1080–1130	≥796	≥955	28–31 MGOe	80°C
N35	1170–1220	≥868	≥955	33–36 MGOe	80°C
N38	1220–1250	≥899	≥955	36–39 MGOe	80°C
N40	1250–1280	≥907	≥955	38–41 MGOe	80°C
N42	1280–1320	≥915	≥955	40–43 MGOe	80°C
N45	1320–1380	≥923	≥955	43–46 MGOe	80°C
N48	1380–1420	≥923	≥876	46–49 MGOe	80°C
N50	1400–1450	≥796	≥876	48–51 MGOe	60°C
N52	1430–1480	≥796	≥876	50–53 MGOe	60°C

Material reference

Physical and thermal properties.

Modulus of elasticity: 22 × 10⁶ psi
Ultimate tensile strength: 12 × 10³ psi
Density: 7.4 g/cc
Electrical resistivity: 160 μohm cm
Curie temperature: 310°C
Recoil permeability: 1.05
Maximum service temperature: 80°C–200°C