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Neodymium Magnet Specifications & Tolerances

List of rare earth neodymium magnet physical, magnetic, thermal and plating properties, tolerances and specs

Visit our magnet finder to find a size or shape or for the pull force and surface field of each of our stock magnets listed in table format


Neodymium Magnet Magnetic Specifications & Tolerances

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
N50H 14.1-14.5 KGs >11.4 KOe >16 KOe 48-50 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
N48SH 13.8-14.2 KGs >11.4 KOe >19 KOe 45-48 MGOe
N50SH 14.1-14.5 KGs >11.4 KOe >19 KOe 48-50 MGOe
N52SH 14.3-14.8 KGs >11.4 KOe >19 KOe 49-52 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
N42UH 13.0-13.3 KGs >11.4 KOe >25 KOe 40-42 MGOe
N45UH 13.3-13.7 KGs >11.4 KOe >25 KOe 42-45 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
N40EH 12.6-12.9 KGs >10.8 KOe >30 KOe 38-40 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

 

Neodymium Magnet Thermal Specifications & Tolerances

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.

 

Neodymium Magnet Physical and Mechanical Specifications & Tolerances

Dimensional Tolerance

 ±0.004 in (.1mm)

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 (p)

 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

 

Neodymium Magnet Plating Specifications & Tolerances

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.

Neodymium Magnet Units of Measure

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)

 

Neodymium Magnet Unit of Measure Conversion Table

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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