Neodymium Magnet

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Custom Neodymium Magnets

Our tailor-made neodymium magnets offer complete customization in terms of materials, dimensions, forms, and platings, ensuring that they cater to a wide variety of market requirements.

Custom
Grade

  • N35 – N55 (80℃)
  • N35M – N55M (100℃)
  • N35H – N52H (120℃)
  • N30SH – N48SH (150℃)
  • N30UH – N42UH (180℃)
  • N28EH – N40EH (200℃)
  • N28AH – N35AH (220℃)

Custom
Size

  • Disc Magnet
    Max D250*H60mm,
    Min D1*H0.3mm.
  • Block Magnet
    Max L250*W80mm* H60mm, Min L0.9*W0.8mm* H0.3mm.
  • Ring Magnet
    MaxD250*d130*H60mm, Min D2*d1*H0.3mm.

Custom
Shape

  • Ring magnet Magnet
  • Disc/Cylinder Magnet
  • Countersunk Magnet
  • Rod/Bar Magnet
  • Segment/Arc Magnet
  • Trapezoid Magnet

Custom
Plating

  • Ni-Cu-Ni
  • Ni-Cu+Black Nickel
  • Ni-Cu-Ni+Epoxy
  • Ni-Cu-Ni+Gold
  • Zinc

All You Need to Know About Neodymium Magnets

Neodymium Magnet

A neodymium magnet, also known as a NdFeB magnet or Neo magnet, is a rare-earth magnet made from an alloy of neodymium, iron, and boron.

These magnets are renowned for their exceptional magnetic strength and are considered the strongest permanent magnets commercially available.

Due to their impressive properties, neodymium magnets are widely used in various applications across numerous industries, such as electronics, automotive, renewable energy, and medical devices. 

Custom neodymium magnet, designed in unique shapes and sizes for specialized applications.
Various applications of neodymium magnets, illustrating their use in electronics, automotive, industrial machinery, and consumer products.

What Are Neodymium Magnets Used For?

How Do Neodymium Magnets Work?

Neodymium magnets work by producing a strong magnetic field as a result of their unique composition and crystal structure. This is due to the alignment of magnetic domains within the magnet, which creates a powerful and focused magnetic field that can attract ferromagnetic materials or other magnets.

The strength of neodymium magnets comes from the combination of neodymium, iron, and boron, which forms a crystalline structure known as Nd2Fe14B. This structure allows the magnetic domains to align more easily, leading to a much stronger magnetic field than other magnets.

Why Choose Neodymium Magnets?

Strong Strength, Lightweight
Custom Magnets to Fit Unique Design
Various Applications with Low MOQ
Often the Most Cost-effective Option

Considerations When Purchasing Neodymium Magnets

#1 Size Limitations

Neodymium magnets have a limit of size. The below table shows the maximum and minimum sizes for Block, Ring, and Disc-shaped NdFeB magnets.

Block Length Width Height/Thickness Magnetized Direction
Maximum 1
240mm
80mm
40mm
Height
Maximum 2
150mm
100mm
45mm
Height
Minimum
1mm
1mm
1mm
Height
Rings Outer Diameter Internal Diameter Height/Thickness Magnetized Direction
Maximum 1
200mm
180mm
40mm
Height
Maximum 2
90mm
70mm
80mm
Diameter
Minimum
3mm
1mm
1mm
Height/Diameter
Discs/Rods Diameter Height/Thickness Magnetized Direction
Maximum
200mm
30mm
Height/Diameter
Minimum
1mm
0.5mm
Height/Diameter

#2 Tolerance

The common tolerances for neodymium magnets are typically in the range of ±0.1mm (±0.004 inches) for smaller magnets and ±0.2mm (±0.008 inches) for larger magnets. 

Magnet Size Outer Diameter Internal Diameter Length Width Height
< 5mm
±0.1mm
±0.1mm
±0.1mm
±0.1mm
±0.1mm
< 10mm
±0.1mm
±0.1mm
±0.1mm
±0.1mm
±0.1mm
< 20mm
±0.1mm
±0.1mm
±0.1mm
±0.1mm
±0.1mm
< 50mm
±0.1mm
±0.1mm
±0.1mm
±0.1mm
±0.1mm
<100mm
±0.15mm
±0.15mm
±0.15mm
±0.15mm
±0.15mm
>100mm
±0.2mm
±0.2mm
±0.2mm
±0.2mm
±0.2mm

#3 Shape

We can manufacture and supply almost any shape and size of custom-designed permanent neodymium magnet to fit in with your desired products:

#4 Plating

Sintered neodymium magnet are highly vulnerable to corrosion in moist environments because of their high iron content. This vulnerability is addressed in many commercial products by adding a protective coating. We have various coatings available finished by our own in-house plating production lines:

Plating Characteristics Table

Plating Type Overall Thickness Salt Spray Test Pressure Cooker Test Color Feature
Ni-Cu-Ni
15-21 μm
24 hours
48 hours
Shiny Silver
A triple plating of nickel-copper-nickel, the most common choice for plating neodymium magnets.
Ni-Cu+Black Nickel
15-21 μm
24 hours
48 hours
Shiny Gunmetal
A black dye is added, triple plating of nickel-copper-black nickel.
Ni-Cu-Ni+Epoxy
20-28 μm
48 hours
72 hours
Black
A plastic coating that is more corrosion resistant as long as the coating is intact. Easily scratched.
Ni-Cu-Ni+Gold
16-23 μm
36 hours
72 hours
Gold
Gold plating is applied over the top of standard nickel plating.
Zinc
7-15 μm
12 hours
24 hours
Dull Gray/Bluish
Zinc is more susceptible to corrosion than nickel.

Partial Magnetic Characteristics

Material Type Residual Flux Density (Br) Max.Energy Product (BH)max
N35
11.7-12.1 KGs
33-35 MGOe
N38
12.2-12.6 KGs
36-38 MGOe
N40
12.6-12.9 KGs
38-40 MGOe
N42
13.0-13.2 KGs
40-42 MGOe
N45
13.3-13.7 KGs
43-45 MGOe
N48
13.8-14.2 KGs
45-48 MGOe
N50
14.1-14.5 KGs
48-50 MGOe
N52
14.5-14.8 KGs
49.5-52 MGOe

#5 Neodymium Magnet Grade

The higher the grade, the stronger the neodymium magnets, whereas the higher the cost and the manufacturing difficulties. From the point of cost-saving and efficiency, we assist in the suitable grade selection, which could hit the spot detail for your products in the commercial application.

  • N35 – N54
  • N35M – N54M
  • N35H – N52H
  • N30SH – N48SH
  • N30UH – N42UH
  • N28EH – N40EH
  • N28AH – N35AH

#6 Magnetic Pull Force

Pull force is a measure of the force required to separate a neodymium magnet from a ferromagnetic material, like a steel plate or another magnet, when they are in direct contact.

It is typically measured in units of pounds (lbs) or Newtons (N).

The pull force of a neodymium magnet depends on its size, shape, grade, thickness, and type of ferromagnetic material with which it is in contact.

Neodymium Material Grade Suffix Maximum Operating Temperature Curie Temperature
No Suffix
176°F (80°C)
590°F (310°C)
M
212°F (100°C)
644°F (340°C)
H
248°F (120°C)
644°F (340°C)
SH
302°F (150°C)
644°F (340°C)
UH
356°F (180°C)
662°F (350°C)
EH
392°F (200°C)
662°F (350°C)
AH
428°F (220°C)
662°F (350°C)

#7 Operation Temperature

Before purchasing neodymium magnets, we should ensure their operating temperature remains within the appropriate range for their grade to avoid performance issues, demagnetization, or damage to the magnet or surrounding components.

Maximum Working Temperature:

This is the highest temperature at which a neodymium magnet can maintain its magnetic properties without significant magnetization loss.

Curie Temperature:

The Curie temperature is when a magnet loses its magnetic properties entirely and becomes demagnetized.

#8 Magnetized Direction

The direction is  irreversible once it is oriented. The magnetized directions have the strongest magnetism, but the rest is very poor and weak. Hence, it should be taken into consideration bfore we start a product design or production

Single-pole Magnetization:

Magnets with a conventional magnetization pattern have a single, equal strength pole on each opposite face.

Multiple-pole Magnetization:

Magnets with a two-pole or multi-pole magnetization pattern have two or more poles on one face of the magnet.

Single-pole Magnetization
Multi-pole Magnetization
The Magnetic Shield Packaging for Neodymium Magnets

#9 Secure Packaging & Shipping

Huge care and expertise are employed in packing neodymium magnets to ensure safe transportation and prevent potential damage or interference with nearby electronic devices. This involves using:

#10 Separating Magnets Correctly

Neodymium magnets are fragile, handle with care.

#11 Caution

REQUEST A QUOTE FOR MORE DETAILS

Pull Force Calculator

The theoretical maximum pull force of a neodymium magnet is usually specified assuming ideal conditions (perfectly flat surfaces, no air gaps, and the magnet’s maximum operating temperature not exceeded).

The actual pull force may be less than the specified value due to surface roughness, air gaps, and uneven weight distribution.

Cylinder/ Disc Shape

Block Shape

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
1Kg = 9.81 N

Physical Properties of Neodymium Magnet

Item Figure
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
Magnetized Direction:
Magnetized Direction
Young's Modulus
160 GPa (23,200 ksi)
Recoil Permeability
1.05 μrec
Max Working Temp.:
Max Working Temp.:
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

Magnetic Properties of Neodymium Magnet

Magnets are graded by the magnetic material from which they are manufactured. Generally speaking, the higher the grade of material, the stronger the magnet. Neodymium magnets

Grade Remanence
Range
(Br)
Intrinsic Coercive Force
Min Value
(Hcj)
Coercive Force
Min Value
(Hcb)
Maximum Energy
Max Range
(BH)
Working Temp
Maximum
(℃)
Unit
T
kGs
kA/m
kOe
kA/m
kOe
kJ/m3
MGOe
N35
1.17~1.22
11.7~12.2
955
12
868
10.9
263~287
33~36
≤80
N38
1.22~1.27
12.2~12.7
955
12
899
11.3
287~310
36~39
≤80
N40
1.25~1.30
12.5~13.0
955
12
923
11.6
302~326
38~41
≤80
N42
1.28~1.34
12.8~13.4
955
12
923
11.6
318~342
40~43
≤80
N45
1.33~1.38
13.3~13.8
955
12
876
11
342~366
43~46
≤80
N48
1.37~1.43
13.7~14.3
955
12
892
11.2
366~390
46~49
≤80
N50
1.39~1.45
13.9~14.5
876
11
836
10.5
374~406
47~51
≤80
N52
1.42~1.47
14.2~14.7
876
11
836
10.5
390~422
49~53
≤80
N35M
1.17~1.22
11.7~12.2
1114
14
868
10.9
263~287
33~36
≤100
N38M
1.22~1.27
12.2~12.7
1114
14
899
11.3
287~310
36~39
≤100
N40M
1.25~1.30
12.5~13.0
1114
14
923
11.6
302~326
38~41
≤100
N42M
1.28~1.34
12.8~13.4
1114
14
955
12
318~342
40~43
≤100
N45M
1.33~1.38
13.3~13.8
1114
14
995
12.5
342~366
43~46
≤100
N48M
1.37~1.43
13.7~14.3
1114
14
1019
12.8
358~390
46~49
≤100
N50M
1.39~1.45
13.9~14.5
1114
13
1035
13
374~406
47~51
≤100
N52M
1.42~1.47
14.2~14.7
1114
13
1050
13
390~422
49~53
≤100
N35H
1.17~1.22
11.7~12.2
1353
17
868
10.9
263~287
33~36
≤120
N38H
1.22~1.27
12.2~12.7
1353
17
899
11.3
287~310
36~39
≤120
N40H
1.25~1.30
12.5~13.0
1353
17
923
11.6
302~326
38~41
≤120
N42H
1.28~1.34
12.8~13.4
1353
17
955
12
318~342
40~43
≤120
N45H
1.33~1.38
13.3~13.8
1353
17
963
12.1
334~358
43~46
≤120
N48H
1.37~1.43
13.7~14.3
1353
16
971
12.2
342~366
45~49
≤120
N50H
1.39~1.45
13.9~14.5
1353
16
1074
13.1
374~406
47~51
≤120
N52H
1.42~1.47
14.2~14.7
1353
16
1082
13.2
390~422
49~53
≤120
N30SH
1.08~1.14
10.8~11.4
1592
20
804
10.1
223~254
28~32
≤150
N33SH
1.13~1.18
11.3~11.8
1592
20
844
10.6
247~270
31~34
≤150
N35SH
1.17~1.22
11.7~12.2
1592
20
876
11
263~287
33~36
≤150
N38SH
1.22~1.27
12.2~12.7
1592
20
907
11.4
287~310
36~39
≤150
N40SH
1.25~1.30
12.5~13.0
1592
20
939
11.8
302~326
38~41
≤150
N42SH
1.28~1.34
12.8~13.4
1592
20
971
12.2
318~342
40~43
≤150
N45SH
1.32~1.38
13.2~13.8
1592
19
995
12.3
342~366
43~46
≤150
N48SH
1.36~1.42
13.6~14.2
1512
19
995
12.5
358~390
45~49
≤150
N28UH
1.02~1.08
10.2~10.8
1990
25
764
9.6
207~231
26~29
≤180
N30UH
1.08~1.14
10.8~11.4
1990
25
812
10.2
223~254
28~32
≤180
N33UH
1.13~1.18
11.3~11.8
1990
25
852
10.7
247~270
31~34
≤180
N35UH
1.17~1.22
11.7~12.2
1990
25
860
10.8
263~287
33~36
≤180
N38UH
1.22~1.27
12.2~12.7
1990
25
876
11
287~310
36~39
≤180
N40UH
1.26~1.30
12.6~13.0
1911
24
915
11.5
302~326
38~41
≤180
N42UH
1.30~1.35
13.0~13.5
1911
24
971
12.2
310~342
39~43
≤180
N28EH
1.04~1.09
10.4~10.9
2388
30
780
9.8
207~231
26~29
≤200
N30EH
1.08~1.14
10.8~11.4
2388
30
812
10.2
223~254
28~32
≤200
N33EH
1.13~1.18
11.3~11.8
2388
30
820
10.3
247~270
31~34
≤200
N35EH
1.17~1.22
11.7~12.2
2388
30
836
10.5
263~287
33~36
≤200
N38EH
1.22~1.27
12.2~12.7
2388
30
915
11.5
279~310
35~39
≤200
N28AH
1.02~1.09
10.2~10.9
2706
34
780
9.8
199~231
25~29
≤240
N30AH
1.07~1.13
10.7~11.3
2706
34
812
10.2
215~247
27~31
≤240
N33AH
1.11~1.17
11.1~11.7
2706
34
820
10.5
239~271
30~34
≤240

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