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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.
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.
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.
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 |
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 |
We can manufacture and supply almost any shape and size of custom-designed permanent neodymium magnet to fit in with your desired products:
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 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. |
| 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 |
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.
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) |
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.
This is the highest temperature at which a neodymium magnet can maintain its magnetic properties without significant magnetization loss.
The Curie temperature is when a magnet loses its magnetic properties entirely and becomes demagnetized.
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
Magnets with a conventional magnetization pattern have a single, equal strength pole on each opposite face.
Magnets with a two-pole or multi-pole magnetization pattern have two or more poles on one face of the magnet.
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:
Neodymium magnets are fragile, handle with care.
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.
| 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) |
| 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 |
| 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 |
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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