Custom Neodymium Magnets

MagnetsTek Engineering offers fast lead times and competitive pricing for customized neodymium magnets in various shapes, sizes, coatings, and magnetizing directions. Request a rapid quote or receive design support.

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Customized Neodymium Magnets for Your Unique Projects!

Knowing the Grade/Strength
After setting the material type, you need to figure out how strong you want the magnet to be, or what is the maxium working temperature.
Shape and Dimension
Neodymium magnets are available in various shapes and sizes, including discs, blocks, rings, and custom shapes.
Coating
Neodymium magnets are commonly coated to protect them from corrosion and to improve their durability.
Magnetizing Direction
Magnetizing directions refer to the orientation of the magnetic field within a magnet. The direction influences magnet's performance and application.
Temperature Effects
Temperature greatly affects neodymium magnets' performance, making it crucial to understand its impact for optimal use and longevity.

Neodymium magnets, known as NdFeB, NIB, or Neo magnets, are the most widely used rare earth magnets. It is a permanent magnet made from an alloy of neodymium, iron, and boron to form the Nd2Fe14B tetragonal crystalline structure. This magnet type is part of the rare earth magnet family and is considered the most vital permanent magnet available commercially.

Customize neodymium magnets from MagnetsTek Engineering according to your requirements. We have grade N52, N54, and N56 super strong magnets with custom shapes, dimensions, and coatings. Moreover, Magnetstek can magnetize magnets with thicknesses up to 115mm for MRI.

Strength/Grade

Neodymium Magnets Grade

Magnetstek Engineering has been supplying Neodymium Magnets for over 20 years. We manufacture strong Neodymium magnets according to our customers’ requirements and offer competitive prices. Our NdFeB Magnet Grades ranged from N35 to N56 and N to NTH. NdFeB magnets are graded based on their magnetic properties and performance characteristics. The “NdFeB Magnet Grades” is a standardized way to communicate the material’s maximum energy product, a crucial indicator of its strength.

The standard notation for NdFeB Magnet Grades consists of the following format: Nxx, where “N” stands for Neodymium and “xx” represents a two-digit number. The higher the number, the higher the maximum energy product and, consequently, the stronger the magnet. Additionally, some grades may include additional specifications ending with one or two letters, such as “H”, “M”, and “UH”. This gives information on the maximum working temperature resistance.

Magnetstek Engineering achieved exceptional NdFeB Magnet Grades of N54 and N56, which are even stronger than N52. We have also pushed the industry’s maximum operation temperature to 250°C/482°F (Grade NxxTH).

Here are the NdFeB Magnet Grades:

1. N35, N40, N42, N45, N48, N50, N52, N54, N56

These are among the lower grades, with N35 being less powerful and N52 being stronger within this range. The maximum operating temperature is 80°C/176°F while 70°C/158°F for N50 and N52.

2. N30M, N35M, N40M, N42M, N45M, N48M, N50M

The “M” in these grades indicates a medium temperature rating. These magnets are suitable for applications where elevated temperatures are a consideration. The maximum operating temperature is 100°C/212°F.

3. N30H, N33H, N35H, N38H, N40H, N42H, N45H, N48H

The “H” denotes a high-temperature rating, making these magnets more suitable for applications where heat resistance is essential. The maximum operating temperature is 120°C/248°F.

4. N30SH, N33SH, N35SH, N38SH, N40SH, N42SH, N45SH

The “SH” signifies a super high-temperature rating, suitable for applications with even higher operating temperatures. The maximum operating temperature is 150°C/302°F.

5. N28UH, N30UH, N33UH, N35UH, N38UH, N40UH, N42UH, N45UH

The “UH” indicates an ultra-high-temperature rating, making these magnets suitable for extremely high-temperature environments. The maximum operating temperature is 180°C/356°F.

6. N28EH, N30EH, N33EH, N35EH, N38EH, N40EH

The “EH” represents an extra high-temperature rating, suitable for applications requiring a balance of high strength and temperature resistance. The maximum operating temperature is 200°C/392°F.

7. N28AH, N30AH, N33AH, N35AH, N38AH

The maximum operating temperature is 230°C/446°F.

8. N30TH, N33TH, N35TH

The maximum operating temperature is 250°C/482°F.

Grade	Remanence Induction/Br.		Coercive Force/HcB		Intrinsic Coercive Force/HcJ		Maximum Energy Product/(BH)max		Max Working Temp.	Curie Temp.
	T	KGs	KA/m	KOe	KA/m	KOe	KJ/m³	MGOe	°C/°F	°C/°F
N35	1.17-1.21	11.7-12.1	≥876	≥11	≥955	≥12	263-279	33-35	80/176	310/590
N38	1.23-1.30	12.3-13.0	≥876	≥11	≥955	≥12	287-318	36-40	80/176	310/590
N40	1.26-1.32	12.6-13.2	≥876	≥11	≥955	≥12	302-334	38-42	80/176	310/590
N42	1.29-1.35	12.9-13.5	≥876	≥11	≥955	≥12	318-350	40-44	80/176	310/590
N45	1.32-1.38	13.2-13.8	≥876	≥11	≥955	≥12	334-366	42-46	80/176	310/590
N48	1.37-1.43	13.7-14.3	≥876	≥11	≥955	≥12	358-390	45-49	80/176	310/590
N50	1.40-1.45	14.0-14.5	≥876	≥11	≥955	≥12	374-406	47-51	70/158	310/590
N52	1.42-1.48	14.2-14.8	≥836	≥10.5	≥876	≥11	390-422	49-53	70/158	310/590
N54	1.45-1.49	14.5-14.9	≥836	≥10.5	≥955	≥11	406-437	51-55	80/176	310/590
N56	1.47-1.51	14.7-15.1	≥836	≥10.5	≥876	≥12	414-454	52-57	80/176	310/590
N35M	1.17-1.21	11.7-12.1	≥892	≥11.2	≥1114	≥14	263-279	33-35	100/212	340/644
N38M	1.23-1.30	12.3-13.0	≥915	≥11.5	≥1114	≥14	287-318	36-40	100/212	340/644
N40M	1.26-1.32	12.6-13.2	≥939	≥11.8	≥1114	≥14	302-334	38-42	100/212	340/644
N42M	1.29-1.35	12.9-13.5	≥963	≥12.1	≥1114	≥14	318-350	40-44	100/212	340/644
N45M	1.32-1.38	13.2-13.8	≥987	≥12.4	≥1114	≥14	334-366	42-46	100/212	340/644
N48M	1.37-1.43	13.7-14.3	≥1019	≥12.8	≥1114	≥14	358-390	45-49	100/212	340/644
N50M	1.40-1.45	14.0-14.5	≥1043	≥13.1	≥1114	≥14	374-406	47-51	100/212	340/644
N52M	1.42-1.48	14.2-14.8	≥1059	≥13.3	≥1114	≥14	390-422	49-53	100/212	340/644
N33H	1.14-1.17	11.4-11.7	≥820	≥10.3	≥1353	≥17	247-263	31-33	120/248	340/644
N35H	1.17-1.24	11.7-12.4	≥876	≥11.0	≥1353	≥17	263-295	33-37	120/248	340/644
N38H	1.23-1.30	12.3-13.0	≥915	≥11.5	≥1353	≥17	286-318	36-40	120/248	340/644
N40H	1.26-1.32	12.6-13.2	≥939	≥11.8	≥1353	≥17	302-334	38-42	120/248	340/644
N42H	1.29-1.35	12.9-13.5	≥963	≥12.1	≥1353	≥17	318-350	40-44	120/248	340/644
N45H	1.32-1.38	13.2-13.8	≥987	≥12.4	≥1353	≥17	334-366	42-46	120/248	340/644
N48H	1.37-1.43	13.7-14.3	≥1011	≥12.7	≥1353	≥17	358-390	45-49	120/248	340/644
N50H	1.40-1.45	14.0-14.5	≥1027	≥12.9	≥1353	≥17	374-406	47-51	120/248	340/644
N30SH	1.08-1.12	10.8-11.2	≥804	≥10.1	≥1592	≥20	223-239	28-30	150/302	340/644
N33SH	1.14-1.21	11.4-12.1	≥852	≥10.7	≥1592	≥20	247-279	31-35	150/302	340/644
N35SH	1.17-1.24	11.7-12.4	≥876	≥11.0	≥1592	≥20	263-295	33-37	150/302	340/644
N38SH	1.23-1.29	12.3-12.9	≥915	≥11.5	≥1592	≥20	287-318	36-40	150/302	340/644
N40SH	1.26-1.32	12.6-13.2	≥939	≥11.8	≥1592	≥20	302-334	38-42	150/302	340/644
N42SH	1.29-1.35	12.9-13.5	≥963	≥12.1	≥1592	≥20	318-350	40-44	150/302	340/644
N45SH	1.32-1.38	13.2-13.8	≥987	≥12.4	≥1592	≥20	334-366	42-46	150/302	340/644
N48SH	1.37-1.43	13.7-14.3	≥1011	≥12.7	≥1592	≥20	358-390	45-49	150/302	340/644
N50SH	1.40-1.45	14.0-14.5	≥1027	≥12.9	≥1592	≥20	374-406	47-51	150/302	340/644
N28UH	1.04-1.08	10.4-10.8	≥780	≥9.8	≥1990	≥25	207-223	26-28	180/356	350/662
N30UH	1.08-1.13	10.8-11.3	≥796	≥10.0	≥1990	≥25	223-255	28-31	180/356	350/662
N33UH	1.14-1.18	11.4-11.8	≥852	≥10.5	≥1990	≥25	247-279	31-35	180/356	350/662
N35UH	1.17-1.24	11.7-12.4	≥876	≥11.0	≥1990	≥25	263-295	33-37	180/356	350/662
N38UH	1.23-1.29	12.3-12.9	≥915	≥11.5	≥1990	≥25	287-318	36-40	180/356	350/662
N40UH	1.26-1.32	12.6-13.2	≥939	≥11.8	≥1990	≥25	302-334	38-42	180/356	350/662
N42UH	1.28-1.35	12.8-13.5	≥963	≥12.1	≥1990	≥25	310-350	39-44	180/356	350/662
N45UH	1.32-1.38	13.2-13.8	≥987	≥12.4	≥1990	≥25	334-366	42-46	180/356	350/662
N48UH	1.37-1.42	13.7-14.2	≥1019	≥12.8	≥1910	≥24	358-390	45-49	180/356	350/662
N30EH	1.08-1.15	10.8-11.5	≥812	≥10.2	≥2388	≥30	223-255	28-32	200/392	350/662
N33EH	1.14-1.21	11.4-12.1	≥851	≥10.7	≥2388	≥30	247-279	31-35	200/392	350/662
N35EH	1.17-1.24	11.7-12.4	≥876	≥11.0	≥2388	≥30	263-295	33-37	200/392	350/662
N38EH	1.23-1.29	12.3-12.9	≥915	≥11.5	≥2388	≥30	287-318	36-40	200/392	350/662
N40EH	1.26-1.32	12.6-13.2	≥939	≥11.8	≥2388	≥30	302-334	38-42	200/392	350/662
N42EH	1.28-1.35	12.8-13.5	≥963	≥12.1	≥2388	≥30	310-350	39-44	200/392	350/662
N45EH	1.33-1.38	13.3-13.8	≥995	≥12.5	≥2308	≥29	334-366	42-46	200/392	350/662
N28AH	1.04-1.12	10.4-11.2	≥772	≥9.7	≥2786	≥35	207-239	26-30	230/446	350/662
N30AH	1.08-1.15	10.8-11.5	≥812	≥10.2	≥2786	≥35	223-255	28-32	230/446	350/662
N33AH	1.14-1.21	11.4-12.1	≥852	≥10.7	≥2786	≥35	247-279	31-35	230/446	350/662
N35AH	1.17-1.24	11.7-12.4	≥876	≥11.0	≥2786	≥35	263-295	33-37	230/446	350/662
N38AH	1.23-1.27	12.3-12.7	≥923	≥11.6	≥2786	≥35	287-318	36-40	230/446	350/662
N40AH	1.26-1.31	12.6-13.1	≥939	≥11.8	≥2628	≥33	302-334	38-42	230/446	350/662
N30TH	1.08-1.13	10.8-11.3	820	10.3	≥3182	≥40	223-247	28-31	250/482	350/662
N33TH	1.11-1.17	11.1-11.7	851	10.7	≥3182	≥40	239-271	31-34	250/482	350/662
N35TH	1.17-1.22	11.7-12.2	867	10.9	≥3182	≥40	263-287	33-36	250/482	350/662

Magnetstek Engineering achieved exceptional grades of N54 and N56, which are even stronger than N52. We have also pushed the industry’s maximum operation temperature to 250°C/482°F(Grade NxxTH).

Neodymium magnets are known for their exceptional strength. The standard notation for NdFeB magnet grades consists of the following format: Nxx, where “N” stands for Neodymium and “xx” represents a two-digit number. The higher the number, the higher the maximum energy product and, consequently, the stronger the magnet.
It’s essential to choose the correct grade based on the specific requirements of your application, considering factors such as temperature, magnetic strength, and cost. Higher-grade magnets generally come at a higher price but offer more robust magnetic performance.

Shape and Dimension

Neodymium Magnet Shapes & Sizes

Neodymium magnets can be produced in various shapes. Generally, there are Rounds, Blocks, Rings, Arcs, Spheres, and Irregular shapes.

The size of neodymium magnets can be varied. The size range is from 0.1 mm to 300 mm now. The tolerance can be as small as +/-0.005mm for micron magnets and +/-0.03mm for regular magnets.

super-large-neodymium-magnet-ring-220mm-d220x110x15

large-size-neodymium-magnet-ring-100x80x50ndfeb-ring-5

Neodymium magnets are available in various shapes and sizes, including discs, blocks, rings, and custom shapes. This versatility makes them suitable for a wide range of applications. With the most advanced equipment, MagnetsTek can produce magnets from 0.1mm Micro Magnets to up to 300mm colossal size. Moreover, we can magnetize fully through thicknesses up to 120mm.

Please find out the shape and dimensions of the magnets you need, or talk to our experts for assistance.

MagnetsTek has a lot of experience producing large neodymium magnets, including large rings, large spheres, large discs, large blocks, large balls and large arc segments.

Coating

Neodymium Magnets Coating

Magnetstek Engineering has been supplying Neodymium Magnets for over ten years. We offer Neodymium magnets with different coatings at highly competitive prices. From standard coating of NiCuNi (Nickel-Copper-Nickel) to gold coating, from zinc coating to black epoxy resin coating, Magnetstek is always your trustworthy partner.

Neodymium magnets are prone to oxidation when exposed to oxygen. They are commonly coated to prevent corrosion and improve durability. The coating also enhances the magnet’s appearance. Various coating options are available depending on the specific application and environmental conditions.

Neodymium magnets can be coated with different materials to protect them from corrosion and improve their durability.

Nickel (Ni-Cu-Ni): The most common coating is nickel (Ni-Cu-Ni), which involves a triple-layer coating of nickel, copper, and nickel. This coating provides excellent corrosion resistance and durability and gives the magnets a silver-like appearance.

Zinc (Zn): Another coating option is zinc (Zn), often used for cost-effective applications. However, zinc-coated magnets are more prone to corrosion than nickel-coated ones. Zinc-coated magnets generally appear dull gray or colorful.

Epoxy Resin: Neodymium magnets can also be coated with an epoxy resin, providing a layer of protection against corrosion and making them more resistant to chipping or breaking. Epoxy-coated magnets are often used in applications where they may be exposed to moisture.

Gold (Au): Gold coating provides excellent corrosion resistance and is often chosen for applications where aesthetics are essential. Gold-coated neodymium magnets have a distinctive gold appearance.

Black Epoxy: Besides clear epoxy coatings, neodymium magnets can be coated with black epoxy for a more discreet appearance. This coating also protects against corrosion.

Phosphating: Some neodymium magnets are coated with a phosphate layer to improve corrosion resistance. Phosphate coatings can be either black or gray.

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
Everlube/Lowewe	8-15 μm	72-500+ hours	96 hours

When choosing a coating for neodymium magnets, it’s crucial to consider the operating environment, potential exposure to moisture, temperature conditions, and the specific requirements of the application. The coating protects the magnet and optimizes its performance in its intended setting.

Neodymium magnets are commonly coated to protect them from corrosion and to improve their durability. The coating also serves to enhance the appearance of the magnet. Depending on the specific application and environmental conditions, various coating options are available. Standard coatings include nickel(Ni-Cu-Ni), zinc(white/colorful zinc), or epoxy. As well as more coatings, such as Gold, Silver, Parylene, etc.

Generally, Ni-Cu-Ni coating suits are used for most occasions.

Magnetizing Direction

Magnetstek Engineering has been supplying rare earth magnets for over two decades. We offer competitive prices for magnets with multiple magnetizing directions. Newly introduced technology makes Magnetstek’s magnetized thickness up to 90mm, almost twice that of our competitors. Magnetizing directions refer to the orientation of the magnetic field within a magnet. The direction in which a magnet is magnetized influences its performance and application. For rare earth magnets, the magnetizing direction plays a crucial role in determining their magnetic properties.

Here are the common magnetizing directions for rare earth magnets:

Discs & Cylinders

Disc and Cylinder magnets can be axially or diametrically magnetized.

Axially Magnetization

Diametrically Magnetization

Rings&Tubes

Rings and tubes like discs and cylinders can be axially or diametrically magnetized.

Axially Magnetization

Diametrically Magnetization

Blocks&Cubes

Block magnets are characterized by their three dimensions: length, width, and thickness. We are occasionally asked if we can provide magnetized block magnets through their length or width. The answer is yes; some long “bar” magnets are magnetized in their longest dimension.

Thickness Magnetization

Arc Segments

Arc segments have usually been magnetized in pairs, SN-NS. So that they can be assembled to one ring on a rotor, there are two other possible magnetization directions.

North on the Outside Curve

South on the Outside Curve

Magnetized through Circumference

Magnetized through Thickness

Special Magnetization

Spheres can be only axially magnetized, and mounting magnets usually have one North pole towards the outside (can be customized).

Spheres Magnetization

Mounting Magnets Magnetization

Multi-Pole Magnetization

Multi-pole magnetization involves creating multiple poles on the surface of the magnet. This can be achieved by magnetizing the magnet with alternating poles along its length or diameter. Multi-pole magnetization is often used in applications requiring a specific magnetic field pattern, especially on Bonded Magnets.

Radial Magnetization

Radial magnetization is also an ordinary ring magnet, with North and South poles in a circle form on the curves.

It’s important to note that the magnetizing direction significantly affects the magnet’s performance in a specific application. When working with neodymium magnets, manufacturers carefully consider the magnetizing direction to meet the intended use requirements.

Feel free to talk to an expert for more information.

Magnetizing directions refer to the orientation of the magnetic field within a magnet. The direction in which a magnet is magnetized influences its performance and application. For neodymium magnets, the magnetizing direction plays a crucial role in determining their magnetic properties. Generally speaking, to obtain the most vital pulling force, we magnetize through thickness and make the poles on the most prominent faces of the magnet.

Out of the factors above, the below information is also vital when dealing with neodymium magnets:

Temperature Effects

NdFeB Magnets Temperature Ratings

Temperature significantly impacts the performance of neodymium magnets (NdFeB magnets). Understanding the effects of temperature is crucial for their proper application and longevity. Here are the critical temperature-related considerations for NdFeB magnets:

Temperature characteristics of NdFeB grades

MAGNET TYPE SUFFIX	Rev.Temp.Coef. of Induction (Br), a, %/°C (20-100°C)	Rev.Temp.Coef. of Coercivity (Hci), b, %/°C (20-100°C)	Max. Working Temperature
			(based on High working point)
	-0.12	-0.6	80 ºC = 176 ºF *
M	-0.12	-0.58	100ºC = 212 ºF
H	-0.11	-0.58	120ºC = 248 ºF
SH	-0.1	-0.55	150 ºC = 302 ºF
UH	-0.09	-0.52	180 ºC = 356 ºF
EH	-0.085	-0.5	200 ºC = 392 ºF
VH / AH	-0.08	-0.45	230 ºC = 446 ºF
			* 60 ºC for N50 and N52

High Temperature Magnets

High temperature magnets, such as Al-Ni-Co, Ferrite, Sm-Co, and Neodymium Magnets, are designed to withstand elevated temperatures, making them ideal for high-temperature applications. These magnets exhibit impressive heat resistance, with specific grades capable of withstanding temperatures up to 650°C.

Neodymium Magnets, known for their exceptional strength, are available in various sizes and heat-resistant grades, offering a wide selection for high-temperature applications.

Samarium Cobalt Magnets, or SmCo magnets, are strong magnets that can work at even higher temperatures up to 500°C.

Ferrite Magnets, known for their cost-effective feature, are typical high temperature magnets.

Additionally, Alnico Magnets, composed of aluminum, nickel, cobalt, and other elements, are recognized for their superior heat resistance, boasting a working temperature of up to 650°C.

The unique properties of these high temperature magnets make them essential for demanding environments where conventional magnets would not be suitable.

Curie Temperature-TC

NdFeB magnets have a specific temperature known as the Curie temperature (Tc), above which they start to lose their magnetic properties. The Curie temperature for NdFeB magnets is typically around 310 to 370 degrees Celsius (590 to 698 degrees Fahrenheit). Beyond this temperature, the material transitions to a paramagnetic state, diminishing its magnetic properties.

Temperature Coefficient of Remanence (Br) and Coercivity (Hc)

The magnetic properties of NdFeB magnets are influenced by temperature. The temperature coefficient of remanence (α) and the temperature coefficient of coercivity (β) describe how the remanence (Br) and coercivity (Hc) change with temperature, respectively. Generally, these coefficients are negative, meaning that as the temperature increases, the magnetic properties decrease.

Demagnetization at High Temperatures

Exposure to temperatures above or close to the Curie temperature can result in demagnetization. If NdFeB magnets are subjected to high temperatures without proper design considerations, they may permanently lose some or all of their magnetization.

Thermal Stability

NdFeB magnets are affected by high temperatures and can also experience thermal demagnetization when subjected to thermal cycling. Repeated exposure to temperature variations can lead to a gradual loss of magnetic strength over time.

Choosing the Right Grade

Choosing NdFeB magnet grade is critical for applications with specific temperature requirements. Higher-grade magnets may have better temperature stability but could be more expensive. It’s essential to select a grade that aligns with the temperature conditions of the application.

Coating Stability

The choice of coating for NdFeB magnets is also important. Some coatings are more resistant to temperature-related degradation and corrosion. Coatings can provide an additional layer of protection against environmental factors.

In summary, it’s crucial to consider the temperature effects on NdFeB magnets when designing applications that involve exposure to different temperature ranges. Proper selection of magnet grade, design considerations, and environmental protection can help mitigate the impact of temperature on the performance and longevity of NdFeB magnets.

Temperature significantly impacts the performance of neodymium magnets (NdFeB magnets). Understanding the effects of temperature is crucial for their proper application and longevity.

The critical temperature-related considerations for NdFeB magnets are Curie Temperature, Temperature Coefficient of Remanence (Br), and Coercivity (Hc).

Handling and Storage

Safety Tips

While strong rare earth magnets, such as NdFeB and SmCo magnets, are widely used for various applications due to their strong magnetic properties, it is essential to be aware of safety considerations when handling these magnets.

Here are some essential safety guidelines:

Avoiding Pinching

Rare earth magnets, such as neodymium and samarium cobalt magnets, are powerful, and if they come together suddenly, they can cause injuries. Be cautious of fingers or other body parts getting caught between attracting magnets.

With large magnets, severe injuries can be caused.

Children and Pets

Rare earth magnets are not toys. Children should not be allowed to handle strong magnets. Choking small magnets or playing with large magnets are equally dangerous to children. If multiple magnets are swallowed, they can attach through intestine walls. This can cause a severe health risk, requiring immediate, emergency surgery if correctly diagnosed.

Keeping Away from Pacemakers

The strong magnetic fields near a neodymium or samarium cobalt magnet can affect pacemakers, ICDs, and other implanted medical devices. Therefore, you must take care to avoid inadvertently deactivating such devices.

Nickel-Allergic

Some people may have a nickel allergy, where an allergic reaction can cause redness and a skin rash. These people should avoid prolonged contact with nickel-coated magnets.

Magnetic Media

Strong magnets can interfere with electronic devices like credit cards, magnetic I.D. cards, VCRs, cassette tapes, floppy disks, and hard drives. Keep strong magnets away from these devices to prevent potential damage.

Navigation and Compasses

Magnetic fields can influence compasses or magnetometers used in air transport. They can also affect the internal compasses of smartphones and GPS devices. IATA (International Air Transport Association) and US Federal rules and regulations cover shipping magnets by air and ground delivery.

Magnets are Brittle and Fragile

Rare earth magnets are made of hard and brittle material. They are not as durable as steel, even if they look like steel. Magnets can chip, peel, crack, or shatter if they are slammed together. Eye protection should be worn when handling magnets.

Rare earth magnets can not easily be re-machined.

Avoiding High Temperatures

Rare earth magnets, especially Neodymium magnets, can become demagnetized at high temperatures. You should know the magnet grade and the maximum operating temperature. A magnet should be stored and used below the maximum temperature.

Magnets are not Waterproof

Though most magnets are coated and protected, they are still not waterproof. In humid environments or even water, neodymium magnets can rust or corrode and lose magnetic strength.

*The icons used on this page are derivative works based on icons by Freepik from www.flaticon.com, licensed by CC BY 3.0.

Handling Neodymium magnets with care is important, as they are brittle and can break easily. Additionally, precautions should be taken to avoid situations where the magnets could pose a danger, such as swallowing, as they can be hazardous if ingested.

Always keep away from pacemakers and children.

Neodymium Magnet Applications

NdFeB Magnet Applications

NdFeB magnets are widely used due to their exceptional magnetic properties. Their high strength and relatively low cost make them popular in various applications, from fridge magnets to magnetic levitation trains, magnet toys, and space crafts. Magnetstek Engineering, with over ten years of industrial experience, supplies quality NdFeB magnets to meet all applications.

Here are some typical applications of NdFeB magnets:

Electronics

NdFeB magnets are in numerous electronic devices, including headphones, speakers, microphones, and electric motors. Their high magnetic strength allows for compact and efficient designs in these applications.

Electric Motors and Generators

NdFeB magnets are widely used in electric motors and generators in automotive, aerospace, and renewable energy industries. Their strong magnetic field contributes to the efficiency and compactness of these devices.

MRI Machines

Magnetic Separators

NdFeB magnets are used in magnetic separation equipment to separate ferrous and non-ferrous materials. This is common in recycling facilities and industries dealing with bulk materials.

Wind Turbines

NdFeB magnets are used in the generators of wind turbines. Their high strength allows for producing more powerful and efficient generators, contributing to the overall performance of wind energy systems.

Automotive Applications

NdFeB magnets are used in various automotive components, including electric power steering systems, windows, sensors, and door locks. Their compact size and strong magnetic field are advantageous in these applications.

Magnetic Couplings

In some mechanical systems, NdFeB magnets are used in magnetic couplings, transmitting torque without direct physical contact. This helps in sealing systems where preventing leaks is crucial.

Sensors and Switches

NdFeB magnets are utilized in various sensors and switches, including reed switches and hall effect sensors. Their magnetic sensitivity makes them suitable for detecting changes in magnetic fields.

Hard Disk Drives

NdFeB magnets are used in hard disk drives to control the movement of the actuator arm. Their magnetic solid force allows for precisely positioning the read/write head.

Consumer Electronics

NdFeB magnets are commonly found in a range of consumer electronics, including mobile phones, laptops, and electric appliances, contributing to the miniaturization and efficiency of these devices.

It’s important to note that while NdFeB magnets have numerous applications, considerations such as temperature stability, coating, and appropriate design are crucial to ensure optimal performance in specific environments.

General Applications of Rare Earth Magnets
ABS systems	Generators, Wind Turbines	Magnetic Bearings	Motors, Rotors
Alternators	Halbach Arrays	Magnetic Clamps	MRI and NMR
Brakes	Headphones	Magnetic Levitation	Orthopedics
Computer Hard Drive, VCM	Healthcare	Magnetic Pump Couplings	Relays
Dentures	Jewelry	Magnetic Separators	Sensors
Door Latches	Lifting Apparatus	Magnetic Suspension	Starter motors
Electro-acoustic pick-ups	Limpet Pot Magnets	Meters	Switches
Fans Eddy Current	Loudspeakers	Microphones	TWT (Transverse Wave Tube)

Neodymium rare earth magnets are mainly used in motors, generators, poly filters, measuring instruments, magnetic drives, magnetic resonance, sensors, linear actuators, microphone assemblies, speakers, magnetic hooks, MRI/NMR, etc.

Unlocking the Power of Neodymium: Your Complete Guide to Custom Neodymium Magnets

Custom neodymium magnets are revolutionizing the world of magnets. These compact and powerful magnetic marvels have the potential to unlock countless possibilities in various industries. Whether it’s in electronics, automotive, renewable energy, or medical equipment, custom neodymium magnets offer exceptional strength and reliability.

With their magnetic strength, these magnets can be crafted into various shapes and sizes to fit specific applications. Their versatility allows them to be used in a wide range of products, from consumer electronics to high-tech industrial equipment.

What sets custom neodymium magnets apart is their superior performance. They possess a significantly higher magnetic energy density compared to other magnets, making them more efficient for various applications. Their strength allows them to hold heavier loads, ensuring optimum performance in different settings.

Moreover, custom neodymium magnets are known for their durability. They can withstand extreme temperatures, making them suitable for both indoor and outdoor use. They also have excellent resistance to corrosion, ensuring a longer lifespan.

In conclusion, custom neodymium magnets are the future of magnet technology. Their compact yet powerful design, versatility, and exceptional performance make them a game-changer in multiple industries.

I. What Set Neodymium Magnets Apart?

Neodymium magnets, also known as rare earth magnets, offer several advantages that set them apart from other types of magnets. One of the key advantages is their exceptionally high magnetic energy density. This means that they can generate a stronger magnetic field compared to other magnets of similar size, making them ideal for applications that require a compact yet powerful magnetic solution.

Another advantage of neodymium magnets is their high coercivity, which allows them to maintain their magnetization in the presence of external magnetic fields. This makes them highly reliable and ensures consistent performance in various settings.

Additionally, neodymium magnets have excellent temperature stability. They can withstand extreme temperatures, making them suitable for applications in environments with high heat or cold. This temperature stability also contributes to their long lifespan and durability.

Furthermore, neodymium magnets have excellent resistance to corrosion. This is due to their composition, which includes a protective coating to prevent oxidation. This resistance to corrosion ensures that the magnets maintain their performance and reliability over time, even in harsh environments.

II. Understanding the Composition of Neodymium Magnets

Neodymium magnets are made from an alloy of neodymium, iron, and boron, commonly referred to as NdFeB. This composition gives the magnets their exceptional magnetic properties, including their high magnetic energy density and coercivity.

The neodymium component, which is a rare earth element, is responsible for the magnets’ strong magnetic field. It provides the magnets with the magnetic strength needed for various applications. The iron component enhances the magnetic properties of the magnets, while the boron component helps to stabilize the crystal structure of the alloy, improving its magnetic performance.

To protect the magnets from corrosion, they are typically coated with a layer of nickel. This nickel coating provides a barrier between the magnets and the surrounding environment, preventing oxidation and ensuring long-term performance.

III. Applications of Neodymium Magnets in Various Industries

Neodymium magnets have found applications in a wide range of industries due to their exceptional strength and versatility. Here are some examples of how these magnets are being used:

Electronics

In the electronics industry, neodymium magnets are used in various devices, including speakers, headphones, and hard disk drives. Their compact size and strong magnetic field make them ideal for miniaturized electronic components. They help to improve the performance of audio devices by providing clear and powerful sound reproduction. In hard disk drives, neodymium magnets are used to precisely position the read and write heads, allowing for faster and more accurate data access.

Automotive

The automotive industry also benefits from the use of neodymium magnets. These magnets are used in electric vehicle motors, hybrid vehicle systems, and various sensors. In electric vehicles, neodymium magnets help to generate the torque required for propulsion, ensuring efficient and powerful performance. They are also used in regenerative braking systems, where they convert kinetic energy into electrical energy, improving overall energy efficiency.

Renewable Energy

Neodymium magnets play a crucial role in renewable energy systems, particularly in wind turbines and solar power systems. In wind turbines, these magnets are used in the generator to convert the rotational energy of the blades into electrical energy. The strong magnetic field of neodymium magnets enables efficient power generation. In solar power systems, neodymium magnets are used in the motors that track the movement of solar panels, ensuring maximum exposure to sunlight.

Medical Equipment

In the medical industry, neodymium magnets find applications in equipment such as magnetic resonance imaging (MRI) machines and magnetic therapy devices. In MRI machines, neodymium magnets are used to generate the strong magnetic field required for imaging. The magnets help to produce detailed and accurate images of internal body structures. In magnetic therapy devices, neodymium magnets are used to provide pain relief and improve blood circulation.

Other Industries

Neodymium magnets are also used in a variety of other industries, including aerospace, defense, and telecommunications. In aerospace applications, these magnets are used in actuators, sensors, and navigation systems. In defense applications, neodymium magnets are used in radar systems, missile guidance systems, and magnetic levitation systems. In telecommunications, these magnets are used in high-frequency antennas and magnetic sensors.

IV. Factors to Consider When Selecting Neodymium Magnets

When choosing neodymium magnets for your applications, several critical factors must be considered to ensure optimal performance and suitability. Here’s a detailed look at the key factors:

1. Magnetic Strength and Grade

Neodymium magnets are available in various grades, which indicate the strength of the magnet. The grade of a neodymium magnet typically ranges from N35 to N52; the higher the number, the stronger the magnet. Choosing the right grade depends on the required magnetic force for your specific application.

2. Size and Shape

The size and shape of the magnet affect its strength and how it can be used. Neodymium magnets come in various forms, such as discs, rings, blocks, and spheres. The choice of size and shape will largely depend on the space available and the magnetic field configuration required for the application.

3. Coating

Neodymium magnets are prone to corrosion, especially in humid or wet environments. To prevent corrosion, these magnets are usually coated with materials such as nickel, zinc, gold, or epoxy. The choice of coating affects the magnet’s resistance to corrosion and its appearance.

4. Temperature Tolerance

The performance of neodymium magnets decreases at high temperatures. Each magnet is rated for a maximum operating temperature, and exceeding this temperature can lead to a permanent loss in magnetic strength. If your application involves high temperatures, consider a high-temperature grade magnet.

5. Environmental Factors

Environmental exposure such as moisture, chemicals, and abrasive conditions can degrade neodymium magnets. It’s crucial to consider the environmental conditions the magnet will face and choose a magnet with appropriate protective coatings or housings.

6. Magnetic Field Requirements

Depending on the application, the configuration of the magnetic field can be crucial. Factors such as the polarity, the intensity of the magnetic field, and the direction of magnetization need to be considered to match your specific needs.

7. Regulatory and Safety Concerns

Neodymium magnets are extremely powerful and can pose hazards if not handled correctly. Safety concerns such as pinching injuries or hazards due to unintended attraction to metal objects need consideration. Furthermore, compliance with regulatory standards for magnetic emissions and safety is essential.

8. Cost Considerations

The cost of neodymium magnets varies based on the grade, size, coating, and quantity ordered. Higher grades and specialized coatings can increase the cost, so it’s important to balance performance requirements with budget constraints.

9. Supplier Reliability

Choosing a reputable supplier is crucial as it affects the quality of the magnets, the consistency of the supply, and the support services available. A reliable supplier will ensure that the magnets meet the specified grades and tolerances and provide assistance in selecting the right magnet for your applications.

By thoroughly evaluating these factors, you can select the most appropriate neodymium magnets for your needs, ensuring performance, durability, and cost-effectiveness.

V. How to Properly Handle and Store Neodymium Magnets

Proper handling and storage of neodymium magnets are crucial to maintain their strength and integrity, as well as to ensure safety due to their powerful magnetic properties. Here are some guidelines to help you manage neodymium magnets effectively:

Handling Neodymium Magnets

Use Protective Gloves: Always wear protective gloves when handling larger magnets to avoid pinching your fingers between magnets or between a magnet and a metal surface.
Avoid Impact: Neodymium magnets are brittle and can crack or chip if they snap together or slam against a hard surface. Handle them gently to prevent collisions.
Keep Away from Electronics: The strong magnetic fields of neodymium magnets can damage electronic devices and magnetic media. Keep magnets away from computers, smartphones, credit cards, watches, and other sensitive equipment.
Secure During Transport: When transporting larger magnets, secure them firmly to prevent movement. The magnetic force can cause them to shift abruptly, which could be dangerous.
Use Spacers: If storing multiple magnets together, place a non-magnetic spacer between them to prevent them from snapping together and causing injury or damage.

Storing Neodymium Magnets

Controlled Environment: Store magnets in a dry, mild temperature environment to prevent corrosion. High humidity and extreme temperatures can degrade the magnet’s protective coating, leading to corrosion.
Separate and Shielded Storage: Store strong magnets separately or in a way that their magnetic fields do not interfere with each other. For extremely powerful magnets, consider using steel sheeting or other magnetic shields to contain the magnetic field.
Avoid Mechanical Stress: Do not stack heavy objects on top of neodymium magnets. The mechanical stress can alter the magnet’s properties or cause physical damage.
Label Storage Areas: Clearly label the storage areas for magnets to warn people who might not be familiar with the strength of neodymium magnets about the potential hazards.

Safety Precautions

Pacemakers and Medical Devices: Keep neodymium magnets away from individuals with pacemakers or other medical devices. Magnets can interfere with the operation of such devices.
Children’s Safety: Keep neodymium magnets out of reach of children. Small magnets can pose a serious choking hazard, and if ingested, they can cause significant internal injury.
Eye Protection: Wear safety goggles when handling large magnets to protect your eyes from potential shrapnel if a magnet chips or shatters.

By following these guidelines for handling and storing neodymium magnets, you can prevent injuries, protect your equipment, and extend the life of the magnets.

VI. Customization Options for Neodymium Magnets

Customization plays a critical role in maximizing the utility of neodymium magnets across various applications. Customizing neodymium magnets involves altering their properties, dimensions, and other specifications to fit specific requirements. Here’s a detailed overview of the main customization options available for neodymium magnets:

1. Size and Shape

Neodymium magnets can be manufactured in virtually any shape and size, depending on the application’s demands. Common shapes include:

Discs
Rings
Blocks
Cylinders
Spheres
Arcs (common in motors)
Custom shapes designed according to specific customer drawings or requirements, such as complex geometric shapes for advanced engineering projects.

2. Magnetic Grade

Choosing the appropriate grade of neodymium magnet is crucial for achieving the desired magnetic performance. Grades typically range from N35 to N52, indicating the strength and resistance to demagnetization. Higher grades are stronger but more expensive. For extreme environments or specialized applications, grades like N42SH or N52M might be selected for their high-temperature resistance or increased magnetic strength.

3. Coating and Plating

The susceptibility of neodymium magnets to corrosion necessitates the application of protective coatings. The choice of coating can also influence the magnet’s appearance and performance in various environments. Common coatings include:

Nickel (Ni-Cu-Ni) – The most common coating due to its effectiveness in resistance against corrosion.
Zinc – A cost-effective alternative that provides good protection.
Epoxy – Used for superior corrosion resistance, especially in marine or harsh environments.
Gold – Provides both aesthetic appeal and corrosion resistance.
Teflon – Often used where the magnet needs to be non-stick or in medical applications.
Parylene – Used for applications requiring biocompatibility and high corrosion resistance.

4. Magnetization Direction

The direction in which a magnet is magnetized affects how it interacts with other components in an assembly. Common magnetization directions include:

Axially magnetized (through thickness)
Diametrically magnetized (through diameter)
Radially magnetized (for ring magnets)
Multi-poles on one face (common in sensory and holding applications)

5. Temperature Ratings

Neodymium magnets have different maximum operating temperatures depending on their material composition. Custom magnets can be designed to withstand specific temperatures, with options available for applications requiring stability under elevated temperatures.

6. Tolerance

Custom tolerance levels can be specified for dimensions and strength, ensuring the magnets perfectly fit into precise mechanical assemblies without additional modification.

7. Assembly Integration

Magnets can be integrated into assemblies with other components, such as metal pieces, plastic molds, or other materials. This might include embedding magnets into parts or creating magnetic assemblies that are ready for installation.

8. Certifications and Testing

For certain industries, like aerospace or medical devices, magnets might need to meet specific standards or undergo rigorous testing to confirm their performance under expected conditions.By exploring these customization options, customers can tailor neodymium magnets to their specific needs, enhancing both the functionality and the efficiency of their applications. This flexibility is crucial in industries where precision and reliability are paramount.

VII. Tips for maximizing the performance and lifespan of neodymium magnets

Maximizing the performance and lifespan of neodymium magnets involves proper handling, usage, and storage. Here are key tips to ensure you get the most out of your neodymium magnets:

1. Handle with Care

Neodymium magnets are brittle and can chip or break if they collide with a hard surface. Always handle magnets with care, especially larger ones, as they can snap together with significant force. Using padding and protective gear, like gloves and safety glasses, can prevent injury and damage to the magnets.

2. Use Appropriate Coatings

To protect neodymium magnets from corrosion, which can lead to a deterioration in magnetic performance, ensure they are coated. Common coatings include nickel, zinc, epoxy, and more specialized coatings like parylene for specific environments. Regularly check the integrity of the coating and replace or re-coat the magnets if you see signs of wear or corrosion.

3. Maintain Optimal Temperature Conditions

Neodymium magnets lose their magnetic properties if heated above their maximum operating temperature. Different grades have different temperature limits, typically ranging from 80°C to 200°C. Keep magnets away from heat sources and consider using higher grade magnets if operating in high-temperature environments.

4. Minimize Impact and Pressure

Physical stress, such as impact from dropping or striking, and excessive pressure from clamping or mechanical stress, can physically damage the magnet or alter its magnetic properties. Store and use magnets in a way that minimizes these risks.

5. Avoid Demagnetizing Influences

Keep neodymium magnets away from electrical currents, other magnets with opposing fields, and any equipment generating significant electromagnetic fields. Exposure to opposing magnetic fields can partially demagnetize your magnets.

6. Proper Storage

Store neodymium magnets in an organized manner:

Place a soft material like foam or rubber between individual magnets to prevent them from attracting each other and breaking.
If possible, store magnets in a closed container to protect them from environmental factors and reduce the risk of accidental contact with other metal objects.
Avoid storing magnets near electronic devices and magnetic media, as their strong fields can cause damage or data loss.

7. Regular Testing and Inspection

Regularly test the strength and integrity of your magnets. This can be especially important in critical applications where a decrease in magnetic performance could lead to failures or safety issues. Inspect for physical and chemical wear, especially around the coatings.

8. Compliance with Handling Guidelines

Educate all users on the proper handling and storage practices for neodymium magnets. This includes safety training to avoid injuries from pinching and proper procedures for assembling and disassembling magnetic assemblies.

By following these tips, you can ensure that your neodymium magnets perform at their best for the longest possible time, supporting efficient operations in any application where they are used.

VIII. Common misconceptions about neodymium magnets

Neodymium magnets, being among the strongest permanent magnets available, are often surrounded by misconceptions due to their powerful magnetic properties and wide range of applications. Here are some common misconceptions about neodymium magnets:

1. Neodymium Magnets are Indestructible

One common myth is that neodymium magnets are indestructible due to their high strength. In reality, while neodymium magnets are very strong magnetically, they are quite brittle and prone to chipping, cracking, or breaking if mishandled, dropped, or allowed to snap together.

2. Higher Grade Means Better for All Applications

Higher grade neodymium magnets (e.g., N52) are often thought to be superior in all aspects because they have a higher magnetic strength. However, higher grades are not always the best choice; they are more sensitive to temperature and can demagnetize more easily at elevated temperatures compared to lower grades. The choice of grade should depend on the specific requirements of the application, including environmental conditions.

3. Neodymium Magnets Can Be Easily Remagnetized

It’s a common belief that if a neodymium magnet becomes demagnetized, it can be easily remagnetized. However, remagnetizing a neodymium magnet to its original strength requires precise control over the magnetic field and temperature, which is not feasible outside of a professional manufacturing or laboratory setting.

4. They Are Safe Around All Electronic Devices

There’s a misconception that small neodymium magnets won’t harm electronics due to their size. Even small neodymium magnets can generate fields strong enough to damage electronic components, erase magnetic media, and affect the operation of medical devices like pacemakers. Caution should always be exercised when using magnets near any electronic devices.

5. All Neodymium Magnets Are the Same

Many people think all neodymium magnets are the same, but they can vary greatly in terms of magnetic strength, size, shape, coating, and temperature tolerance. These factors can dramatically affect their suitability for different applications.

6. Magnets Never Lose Their Magnetism

There is a notion that once magnetized, neodymium magnets will retain their magnetism indefinitely. While it’s true they are permanent magnets, they can lose their magnetism over time if exposed to adverse conditions such as high temperatures, strong opposing magnetic fields, or physical damage.

7. Magnetic Therapy Myths

Magnetic therapy often uses neodymium magnets with claims of health benefits, such as pain relief and enhanced healing. However, there is little scientific evidence to support these health claims, and reliance on magnet therapy for serious conditions can lead to delays in seeking effective medical treatment.

8. Magnets Can be Drilled or Remachined

Can neodymium magnets be drilled or machined? It’s neither easy nor safe. Neodymium sintered magnets have properties similar to ceramics, which makes them prone to cracking and chipping if subjected to drilling. Furthermore, the powder generated during the machining process is highly flammable. Additionally, machining can cause heat to accumulate within the magnet, potentially leading to demagnetization. In most cases, attempting to drill or machine a neodymium magnet will render it unusable due to breakage, cracking, or heat damage.

Understanding these misconceptions can help users better appreciate the real properties of neodymium magnets and employ them more effectively and safely in their specific applications.

IX. Conclusion: Harnessing the power of neodymium magnets for innovation and efficiency

In conclusion, neodymium magnets offer unparalleled strength and versatility, making them invaluable in pushing the boundaries of innovation and efficiency across various industries. By understanding their unique properties and capabilities, businesses can harness the power of these magnets to enhance product performance, streamline manufacturing processes, and develop new, cutting-edge applications.

Whether used in electronics, automotive, healthcare, or renewable energy sectors, neodymium magnets contribute significantly to advancements that shape our modern world. It is essential, however, to handle and integrate these powerful magnets properly to maximize their performance and lifespan, ensuring they deliver the best possible outcomes in every application. With careful consideration and appropriate customization, neodymium magnets continue to be at the forefront of technological innovation, driving efficiency and progress in countless projects and products.

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Knowing the Grade/Strength

Shape and Dimension

Coating

Magnetizing Direction

Temperature Effects

Strength/Grade

N35

N38

N40

N42

N45

N48

N50

N52

N54

N56

N35M

N38M

N40M

N42M

N45M

N48M

N50M

N52M

N33H

N35H

N38H

N40H

N42H

N45H

N48H

N50H

N30SH

N33SH

N35SH

N38SH

N40SH

N42SH

N45SH

N48SH

N50SH

N28UH

N30UH

N33UH

N35UH

N38UH

N40UH

N42UH

N45UH

N48UH

N30EH

N33EH

N35EH

N38EH

N40EH

N42EH

N45EH

N28AH

N30AH

N33AH

N35AH

N38AH

N40AH

N30TH

N33TH

N35TH

Shape and Dimension

Coating

Plating Characteristics

Magnetizing Direction

Axially Magnetization

Diametrically Magnetization

Axially Magnetization

Diametrically Magnetization

Thickness Magnetization

North on the Outside Curve

South on the Outside Curve