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
For use in motor and generator drives, both wind and tidal turbines
Meters
Audio devices - headphones, microphones
PC Disc drives and printers
Vehicles (clamps, sensors, alternators, interior trim)
Aerospace precision magnets - sensors, navigation
Excellent performance pot magnets, fishing magnets or hook magnets
Electronics - switches, relays, sensors
Lifting heavy metal materials - see NdFeB magnetic lifters
Advantages of rare earth magnets
Continuous maintenance of the magnetic field with no loss of strength
lightweight and compact because of the high energy density of the magnet material
is a highly cost-effective solution
No need for maintenance or cooling since the magnet does not generate heat from the energy source
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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