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Specifications of Neodymium Magnets

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 Resistance (R) 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

 

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
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)

 

Plating Characteristics

Plating Type Overall Thickness
NiCuNi (Nickel Copper Nickel) 15-21 μm
NiCu + Black Nickel 15-21 μm
NiCuNi + Epoxy 20-28 μm
NiCuNi + Gold 16-23 μm
NiCuNi + Silver 16-23 μm
Zinc 7-15 μm

 

Pull force and surface field of Neodymium magnets

Please refer to: Magnets Table

 

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

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