Neodymium Magnet Physical Properties

Magnet Summary Table - Click this link for the pull force and surface field of each of our stock magnets listed in table format

Magnetic Characteristics

Material Type	Residual Flux Density (Br)	Coercive Force (Hc)	Intrinsic Coercive Force (Hci)	Max.Energy Product (BH)max
N35	11.7-12.1 KGs	>11.0 KOe	>12 KOe	33-35 MGOe
N38	12.2-12.6 KGs	>11.0 KOe	>12 KOe	36-38 MGOe
N40	12.6-12.9 KGs	>11.0 KOe	>12 KOe	38-40 MGOe
N42	13.0-13.2 KGs	>11.0 KOe	>12 KOe	40-42 MGOe
N45	13.3-13.7 KGs	>11.0 KOe	>12 KOe	43-45 MGOe
N48	13.8-14.2 KGs	>11.0 KOe	>12 KOe	45-48 MGOe
N50	14.1-14.5 KGs	>11.0 KOe	>11 KOe	48-50 MGOe
N52	14.5-14.8 KGs	>11.2 KOe	>11 KOe	49.5-52 MGOe
N35M	11.7-12.1 KGs	>11.4 KOe	>14 KOe	33-35 MGOe
N38M	12.2-12.6 KGs	>11.4 KOe	>14 KOe	36-38 MGOe
N40M	12.6-12.9 KGs	>11.4 KOe	>14 KOe	38-40 MGOe
N42M	13.0-13.3 KGs	>11.4 KOe	>14 KOe	40-42 MGOe
N45M	13.3-13.7 KGs	>11.4 KOe	>14 KOe	42-45 MGOe
N48M	13.6-14.2 KGs	>11.4 KOe	>14 KOe	45-48 MGOe
N50M	14.1-14.5 KGs	>11.4 KOe	>14 KOe	48-50 MGOe
N52M	14.3-14.8 KGs	>12.5 KOe	>13 KOe	49-52 MGOe
N33H	11.4-11.7 KGs	>10.3 KOe	>17 KOe	31-33 MGOe
N35H	11.7-12.1 KGs	>10.8 KOe	>17 KOe	33-35 MGOe
N38H	12.2-12.6 KGs	>11.4 KOe	>17 KOe	36-38 MGOe
N40H	12.6-12.9 KGs	>11.4 KOe	>17 KOe	38-40 MGOe
N42H	13.0-13.3 KGs	>11.4 KOe	>17 KOe	40-42 MGOe
N45H	13.3-13.7 KGs	>11.4 KOe	>17 KOe	42-45 MGOe
N48H	13.6-14.2 KGs	>11.4 KOe	>16 KOe	45-48 MGOe
N35SH	11.7-12.1 KGs	>10.8 KOe	>20 KOe	33-35 MGOe
N38SH	12.2-12.6 KGs	>11.4 KOe	>20 KOe	36-38 MGOe
N40SH	12.6-12.9 KGs	>11.4 KOe	>20 KOe	38-40 MGOe
N42SH	13.0-13.3 KGs	>11.4 KOe	>20 KOe	40-42 MGOe
N45SH	13.3-13.7 KGs	>11.4 KOe	>19 KOe	43-45 MGOe
N30UH	10.8-11.2 KGs	>10.1 KOe	>25 KOe	28-30 MGOe
N33UH	11.4-11.7 KGs	>10.3 KOe	>25 KOe	31-33 MGOe
N35UH	11.7-12.1 KGs	>10.8 KOe	>25 KOe	33-35 MGOe
N38UH	12.2-12.6 KGs	>11.4 KOe	>25 KOe	36-38 MGOe
N40UH	12.6-12.9 KGs	>11.4 KOe	>25 KOe	38-40 MGOe
N30EH	10.8-11.2 KGs	>10.1 KOe	>30 KOe	28-30 MGOe
N33EH	11.4-11.7 KGs	>10.3 KOe	>30 KOe	31-33 MGOe
N35EH	11.7-12.1 KGs	>10.8 KOe	>30 KOe	33-35 MGOe
N38EH	12.2-12.6 KGs	>10.8 KOe	>30 KOe	36-38 MGOe
N30AH	10.8-11.2 KGs	>10.1 KOe	>34 KOe	28-30 MGOe
N33AH	11.4-11.7 KGs	>10.2 KOe	>34 KOe	31-33 MGOe
N35AH	11.7-12.1 KGs	>11.0 KOe	>34 KOe	33-35 MGOe

 

Thermal Characteristics

Neodymium Material Type	Maximum Operating Temp	Curie Temp
N	176°F (80°C)	590°F (310°C)
NM	212°F (100°C)	644°F (340°C)
NH	248°F (120°C)	644°F (340°C)
NSH	302°F (150°C)	644°F (340°C)
NUH	356°F (180°C)	662°F (350°C)
NEH	392°F (200°C)	662°F (350°C)
NAH	428°F (220°C)	662°F (350°C)

The Thermal Characteristics listed above are values commonly associated with each magnet's grade or material.  Actual performance in your application may vary with other factors, including the shape of the magnet, the Permeance Coefficient or load line, and how it is used in a circuit.  See our in-depth article on Temperature and Neodymium Magnets for more details.

 

Physical and Mechanical Characteristics

Density	7.4-7.5 g/cm3
Compression Strength	950 MPa (137,800 psi)
Tensile Strength	80 MPa (11,600 psi)
Vickers Hardness (Hv)	560-600
Young's Modulus	160 GPa (23,200 ksi)
Recoil Permeability	1.05 μrec
Electrical Resistivity (ρ)	160 μ-ohm-cm
Heat Capacity	350-500 J/(kg.°C)
Thermal Expansion Coefficient (0 to 100°C) parallel to magnetization direction	5.2 x 10-6 /°C
Thermal Expansion Coefficient (0 to 100°C) perpendicular to magnetization direction	-0.8 x 10-6 /°C

 

Plating Characteristics

Plating Type	Overall Thickness	Salt Spray Test	Pressure Cooker Test
NiCuNi (Nickel Copper Nickel)	15-21 μm	24 hours	48 hours
NiCu + Black Nickel	15-21 μm	24 hours	48 hours
NiCuNi + Epoxy	20-28 μm	48 hours	72 hours
NiCuNi + Gold	16-23 μm	36 hours	72 hours
NiCuNi + Silver	16-23 μm	24 hours	48 hours
Zinc	7-15 μm	12 hours	24 hours

Each individual layer of Nickel and Copper are 5-7 μm thick. The Gold and Silver plating layers are 1-2 μm thick.
Test results shown to allow comparison between plating options. Performance in your application under your specific test conditions may vary. Salt Spray testing conducted with a 5% NaCl solution, at 35°C. Pressure Cooker Test (PCT) conducted at 2 atm, 120°C at 100% RH.

 

Measurement Systems

Unit	cgs System	SI System	English System
Length (L)	centimeter (cm)	meter (m)	inch (in)
Flux (ø)	Maxwell	Weber (Wb)	Maxwell
Flux Density (B)	Gauss (G)	Tesla (T)	lines/in2
Magnetizing Force (H)	Oersted (Oe)	Ampere turns/m (At/m)	Ampere turns/in (At/in)
Magnetomotive Force (mmf or F)	Gilbert (Gb)	Ampere turn (At)	Ampere turn (At)

 

Conversion Between Systems

cgs System to SI system

1 Oe = 79.62 At/m

10,000 G = 1 T

1 Gb = 0.79577 At

1 Maxwell = 1 Line = 10-8 Wb

1 G = 0.155 lines/in2