What is Neodymium Iron Boron Magnet?
A Neodymium magnet (also known as "NdFeB", "Neo" or rare earth magnet) is a permanent magnet composed of neodymium, iron and boron. They are one of the strongest rare earth magnets of all permanent magnets, and are stronger than samarium cobalt (SmCo), alnico, and ferrite. Besides high magnetic strength, they are also comparatively affordable, which makes them ideal for an extensive array of consumer, business, industrial and technological uses.
NdFeB magnets (neodymium magnets) provide maximum performance with the smallest magnet size. The Neodymium permanent magnet is used in almost all industries, such as the automobile, aeronautics, wind power turbine, military, illumination, food production, separation, electric motor and generating industries.
Permanent NdFeB Magnets Uses
NdFeB magnets are available in several different sizes and variations, including disc magnets, neodymium ball magnets, NdFeB blocks, neodymium ring magnets, neodymium arc magnets, and countersunk hole magnets.
There are also custom neodymium magnets with screwfix, and they can be rubber coated or plastic coated. This offers numerous options to accommodate a wide range of applications, including
Advantages of Rare Earth Magnets
Continuous magnetic field without loss of magnetism
Neodymium magnets can maintain a strong magnetic field for a long time and will not weaken over time. Under normal use conditions, the magnetism of neodymium magnets can remain stable for decades. Compared with some other types of magnets that require regular maintenance or may gradually lose their magnetism, this feature of neodymium magnets makes them an ideal choice for a variety of long-term applications, such as motors, generators, and sensors that require a stable magnetic field.
High energy density, making the magnets light and compact
Neodymium magnet materials have high energy density and can provide strong magnetic force in a small volume. Therefore, neodymium magnets are very light and compact, especially suitable for devices that need to save space, such as headphones, speakers, mobile phones and other portable devices. This feature also makes neodymium magnets widely used in aerospace and automation equipment, helping to maintain lightweight design while ensuring strong magnetic force.
Cost-effective solution
Due to the efficient magnetic output and durability of neodymium magnets, it is very competitive in terms of cost and performance. Neodymium magnets are not only more reasonably priced than other rare earth permanent magnet materials, but also provide higher magnetic output per unit volume. This means that manufacturers can reduce costs while maintaining performance, making neodymium magnets a cost-effective option that is popular in consumer electronics, automotive parts and industrial applications.
No maintenance or cooling required
Neodymium magnets are a permanent magnetic material that does not require external energy to maintain the magnetic field, so they do not generate heat during operation, avoiding the need for a cooling system. In addition, since neodymium magnets have no mechanical parts and will not wear out due to use, this also reduces the complexity of equipment maintenance. This feature not only saves the cost of use, but also significantly improves the reliability of the equipment, making it suitable for use in equipment that requires long-term, continuous operation.
Neodymium Magnets vs Other Magnets
Magnetic strength
Temperature resistance
Corrosion resistance
Cost
Neodymium Magnet Grades
Grade of Rare Earth Neodymium Magnets
NIB magnets are available in different grades, which correspond to their magnetic field strength, from N35 (the weakest and cheapest) to N52 (the strongest, most expensive and more brittle). Below is a list of the NdFeB permanent magnet grades and their respective magnetic properties.
1.Materials: Neodymium-Iron-Boron;
2. Technology: Utilizes new Sintered NdFeB magnet techniques and equipment such as strip casting, HDDR technology;
3. Magnetic properties: High coercive force, the max operation temp is up to 200 degree centigrade or 380 curie temperature;
4. Grades: N35-N52, 30M-50M, 30H-48H, 30SH-45SH, 30UH-40UH and 30EH-38EH;
5. Shapes: Various shapes
6. Size: According to customers' request;
7. Coatings: Ni, Zn, gold, copper, epoxy, chemical, parylene and so on;
8. Applications: Widely used in different applications, such as sensors, motors, rotors, wind turbines/wind generators, loudspeakers, magnetic hooks, magnetic holder, filters automobiles and so on.
NdFeB magnet
NdFeB magnet is an alloy magnet made from ND, Fe, B and other trace metal elements. It is a rare earth magnet known so far for the strongest magnetism as well as high performance (8MGOe-55MGOe) and good coercive force. Proven production process, strict quality assurance, complete technical service and remarkable cost performance.
Machining and tolerances
Neodymium is easily ground, although coolants must be used in the process to avoid spontaneous combustion of powder. Grinding should be completed before coating or plating is applied to protect the magnets from corrosion. Standard tolerances for neodymium magnets are +/-0.05mm for ground dimensions.
Temperature constraints
The temperature coefficient of neodymium has triggered several grades to be developed to meet specific operating requirements. Please refer to our chart of magnetic properties to compare the characteristics of each grade. Before choosing a neodymium magnet be sure to consider your application's maximum operating temperature.
Added value services
Our knowledgeable engineering department is always available to assist in determining the best grade and size of neodymium magnet for your application. We also offer coating and plating choices for magnets we custom-machine.
Technical Data of Sintered NdFeB Magnet | |||||||||
Grade | Br | Hcb | Hcj | (BH)max | (Tw) | ||||
mT | (kGs) | kA/m | (kOe) | kA/m | (kOe) | kJ/m3 | (MGOe) | ||
N35 | 1170-1220 | (11.7-12.2) | ≥868 | ( ≥10.9) | ≥955 | ( ≥12) | 263-287 | (33-36) | 80 ºC |
N38 | 1220-1250 | (12.2-12.5) | ≥899 | ( ≥11.3) | ≥955 | ( ≥12) | 287-310 | (36-39) | 80 ºC |
N40 | 1250-1280 | (12.5-12.8) | ≥907 | ( ≥11.4) | ≥955 | ( ≥12) | 302-326 | (38-41) | 80 ºC |
N42 | 1280-1320 | (12.8-13.2) | ≥915 | ( ≥11.5) | ≥955 | ( ≥12) | 318-342 | (40-43) | 80 ºC |
N45 | 1320-1380 | (13.2-13.8) | ≥923 | ( ≥11.6) | ≥955 | ( ≥12) | 342-366 | (43-46) | 80 ºC |
N48 | 1380-1420 | (13.8-14.2) | ≥923 | ( ≥11.6) | ≥876 | ( ≥12) | 366-390 | (46-49) | 80 ºC |
N50 | 1400-1450 | (14.0-14.5) | ≥796 | ( ≥10.0) | ≥876 | ( ≥11) | 382-406 | (48-51) | 60 ºC |
N52 | 1430-1480 | (14.3-14.8) | ≥796 | ( ≥10.0) | ≥876 | ( ≥11) | 398-422 | (50-53) | 60 ºC |
30M | 1080-1130 | (10.8-11.3) | ≥796 | ( ≥10.0) | ≥1114 | ( ≥14) | 223-247 | (28-31) | 100 ºC |
33M | 1130-1170 | (11.3-11.7) | ≥836 | ( ≥10.5) | ≥1114 | ( ≥14) | 247-263 | (31-33) | 100 ºC |
35M | 1170-1220 | (11.7-12.2) | ≥868 | ( ≥10.9) | ≥1114 | ( ≥14) | 263-287 | (33-36) | 100 ºC |
38M | 1220-1250 | (12.2-12.5) | ≥899 | ( ≥11.3) | ≥1114 | ( ≥14) | 287-310 | (36-39) | 100 ºC |
40M | 1250-1280 | (12.5-12.8) | ≥923 | ( ≥11.6) | ≥1114 | ( ≥14) | 302-326 | (38-41) | 100 ºC |
42M | 1280-1320 | (12.8-13.2) | ≥955 | ( ≥12.0) | ≥1114 | ( ≥14) | 318-342 | (40-43) | 100 ºC |
45M | 1320-1380 | (13.2-13.8) | ≥995 | ( ≥12.5) | ≥1114 | ( ≥14) | 342-366 | (43-46) | 100 ºC |
48M | 1360-1430 | (13.6-14.3) | ≥1027 | ( ≥12.9) | ≥1114 | ( ≥14) | 366-390 | (46-49) | 100 ºC |
50M | 1400-1450 | (14.0-14.5) | ≥1033 | ( ≥13.0) | ≥1114 | ( ≥14) | 382-406 | (48-51) | 100 ºC |
30H | 1080-1130 | (10.8-11.3) | ≥796 | ( ≥10.0) | ≥1353 | ( ≥17) | 223-247 | (28-31) | 120 ºC |
33H | 1130-1170 | (11.3-11.7) | ≥836 | ( ≥10.5) | ≥1353 | ( ≥17) | 247-271 | (31-34) | 120 ºC |
35H | 1170-1220 | (11.7-12.2) | ≥868 | ( ≥10.9) | ≥1353 | ( ≥17) | 263-287 | (33-36) | 120 ºC |
38H | 1220-1250 | (12.2-12.5) | ≥899 | ( ≥11.3) | ≥1353 | ( ≥17) | 287-310 | (36-39) | 120 ºC |
40H | 1250-1280 | (12.5-12.8) | ≥923 | ( ≥11.6) | ≥1353 | ( ≥17) | 302-326 | (38-41) | 120 ºC |
42H | 1280-1320 | (12.8-13.2) | ≥955 | ( ≥12.0) | ≥1353 | ( ≥17) | 318-342 | (40-43) | 120 ºC |
45H | 1300-1360 | (13-13.6) | ≥963 | ( ≥12.1) | ≥1353 | ( ≥17) | 326-358 | (43-46) | 120 ºC |
48H | 1370-1430 | (13.7-14.3) | ≥995 | ( ≥12.5) | ≥1353 | ( ≥17) | 366-390 | (46-49) | 120 ºC |
30SH | 1080-1130 | (10.8-11.3) | ≥804 | ( ≥10.1) | ≥1592 | ( ≥20) | 223-247 | (28-31) | 150 ºC |
33SH | 1130-1170 | (11.3-11.7) | ≥844 | ( ≥10.6) | ≥1592 | ( ≥20) | 247-271 | (31-34) | 150 ºC |
35SH | 1170-1220 | (11.7-12.2) | ≥876 | ( ≥11.0) | ≥1592 | ( ≥20) | 263-287 | (33-36) | 150 ºC |
38SH | 1220-1250 | (12.2-12.5) | ≥907 | ( ≥11.4) | ≥1592 | ( ≥20) | 287-310 | (36-39) | 150 ºC |
40SH | 1240-1280 | (12.5-12.8) | ≥939 | ( ≥11.8) | ≥1592 | ( ≥20) | 302-326 | (38-41) | 150 ºC |
42SH | 1280-1320 | (12.8-13.2) | ≥987 | ( ≥12.4) | ≥1592 | ( ≥20) | 318-342 | (40-43) | 150 ºC |
45SH | 1320-1380 | (13.2-13.8) | ≥1003 | ( ≥12.6) | ≥1592 | ( ≥20) | 342-366 | (43-46) | 150 ºC |
28UH | 1020-1080 | (10.2-10.8) | ≥764 | ( ≥9.6) | ≥1990 | ( ≥25) | 207-231 | (26-29) | 180 ºC |
30UH | 1080-1130 | (10.8-11.3) | ≥812 | ( ≥10.2) | ≥1990 | ( ≥25) | 223-247 | (28-31) | 180 ºC |
33UH | 1130-1170 | (11.3-11.7) | ≥852 | ( ≥10.7) | ≥1990 | ( ≥25) | 247-271 | (31-34) | 180 ºC |
35UH | 1180-1220 | (11.8-12.2) | ≥860 | ( ≥10.8) | ≥1990 | ( ≥25) | 263-287 | (33-36) | 180 ºC |
38UH | 1220-1250 | (12.2-12.5) | ≥876 | ( ≥11.0) | ≥1990 | ( ≥25) | 287-310 | (36-39) | 180 ºC |
40UH | 1240-1280 | (12.5-12.8) | ≥899 | ( ≥11.3) | ≥1990 | ( ≥25) | 302-326 | (38-41) | 180 ºC |
28EH | 1040-1090 | (10.4-10.9) | ≥780 | ( ≥9.8) | ≥2388 | ( ≥30) | 207-231 | (26-29) | 200 ºC |
30EH | 1080-1130 | (10.8-11.3) | ≥812 | ( ≥10.2) | ≥2388 | ( ≥30) | 223-247 | (28-31) | 200 ºC |
33EH | 1130-1170 | (11.3-11.7) | ≥836 | ( ≥10.5) | ≥2388 | ( ≥30) | 247-271 | (31-34) | 200 ºC |
35EH | 1170-1220 | (11.7-12.2) | ≥876 | ( ≥11.0) | ≥2388 | ( ≥30) | 263-287 | (33-36) | 200 ºC |
38EH | 1220-1250 | (12.2-12.5) | ≥899 | ( ≥11.3) | ≥2388 | ( ≥30) | 287-310 | (36-39) | 200 ºC |
28AH | 1040-1090 | (10.4-10.9) | ≥787 | ( ≥9.9) | ≥2624 | ( ≥33) | 207-231 | (26-29) | 230 ºC |
30AH | 1080-1130 | (10.8-11.3) | ≥819 | ( ≥10.3) | ≥2624 | ( ≥33) | 223-247 | (28-31) | 230 ºC |
33AH | 1130-1170 | (11.3-11.7) | ≥843 | ( ≥10.6) | ≥2624 | ( ≥33) | 247-271 | (31-34) | 230 ºC |
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