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NdFeB Rare Earth Magnets
Overview
Neodymium magnets are a member of the Rare Earth magnet family and are the most powerful permanent magnets in the world. They are also referred to as NdFeB magnets, or NIB, because they are composed mainly of Neodymium (Nd), Iron (Fe) and Boron (B).
Applications
NdFeB 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.
License
All of our magnets are licensed and legal for sale in the U.S. and North America. There is no other license that you need to use our neodymium magnets in your product or invention
Grades
Neodymium magnets are all graded by the material they are made of. As a very general rule, the higher the grade (the number following the 'N'), the stronger the magnet. The highest grade of neodymium magnet currently available is N52. Any letter following the grade refers to the temperature rating of the magnet. If there are no letters following the grade, then the magnet is standard temperature neodymium. The temperature ratings are standard (no designation) - M - H - SH - UH - EH.
Platings / Coatings
Neodymium magnets are a composition of mostly Neodymium, Iron and Boron. To protect the magnet from corrosion and to strengthen the brittle magnet material, it is usually preferable for the magnet to be coated. There are a variety of options for coatings, but nickel (Ni-Cu-Ni) is the most common and usually preferred. Some other options for coating are zinc, tin, copper, epoxy, silver and gold.
Grade | Residual Induction Br. |
Coercive Force Hcb. |
Intrinsic Coercive Force Hcj. |
Max. Energy Product BH. |
Max.Operating Temp. |
||||
---|---|---|---|---|---|---|---|---|---|
T | KGS | KA/m | KOe | KA/m | KOe | KJ/m3 | MGOe | °C | |
N35 | 1.17-1.21 | 11.7-12.1 | 876-899 | 11.0-11.3 | ≥955 | ≥12 | 263-279 | 33-25 | ≤80 |
N38 | 1.22-1.26 | 12.2-12.6 | 876-923 | 11.0-11.6 | ≥955 | ≥12 | 287-303 | 36-38 | ≤80 |
N40 | 1.26-1.29 | 12.6-12.9 | 876-923 | 11.0-11.6 | ≥955 | ≥12 | 303-318 | 38-40 | ≤80 |
N42 | 1.30-1.33 | 13.0-13.3 | 876-926 | 11.0-11.6 | ≥955 | ≥12 | 318-334 | 40-42 | ≤80 |
N45 | 1.33-1.37 | 13.3-13.7 | 876-926 | 11.0-11.6 | ≥955 | ≥12 | 342-358 | 43-45 | ≤80 |
N48 | 1.36-1.42 | 13.6-14.2 | 876-926 | 11.0-11.6 | ≥955 | ≥12 | 358-382 | 45-48 | ≤80 |
N50 | 1.41-1.45 | 14.1-14.5 | 828-907 | 10.4-11.4 | ≥876 | ≥11 | 382-398 | 48-50 | ≤70 |
N52 | 1.44-1.48 | 14.4-14.8 | 828-907 | 10.4-11.4 | ≥876 | ≥11 | 394-414 | 49.5-52 | ≤70 |
N35M | 1.17-1.21 | 11.7-12.1 | 892-915 | 11.2-11.5 | ≥1114 | ≥14 | 263-279 | 33-35 | ≤100 |
N38M | 1.22-1.26 | 12.2-12.6 | 907-931 | 11.4-11.7 | ≥1114 | ≥14 | 287-303 | 36-38 | ≤100 |
N40M | 1.26-1.29 | 12.6-12.9 | 907-947 | 11.4-11.9 | ≥1114 | ≥14 | 303-318 | 38-40 | ≤100 |
N42M | 1.30-1.33 | 13.0-13.3 | 907-947 | 11.4-11.9 | ≥1114 | ≥14 | 318-334 | 40-42 | ≤100 |
N45M | 1.33-1.37 | 13.3-13.7 | 907-955 | 11.4-12.0 | ≥1114 | ≥14 | 334-358 | 42-45 | ≤100 |
N48M | 1.36-1.42 | 13.6-14.2 | 907-955 | 11.4-12.0 | ≥1114 | ≥14 | 358-382 | 45-48 | ≤100 |
N33H | 1.14-1.17 | 11.4-11.7 | 820-876 | 10.3-11.0 | ≥1353 | ≥17 | 247-263 | 31-33 | ≤120 |
N35H | 1.17-1.21 | 11.7-12.1 | 860-907 | 10.8-11.4 | ≥1353 | ≥17 | 263-279 | 33-35 | ≤120 |
N38H | 1.22-1.26 | 12.2-12.6 | 907-947 | 11.4-11.9 | ≥1353 | ≥17 | 287-303 | 36-38 | ≤120 |
N40H | 1.26-1.29 | 12.6-12.9 | 907-947 | 11.4-11.9 | ≥1353 | ≥17 | 303-318 | 38-40 | ≤120 |
N42H | 1.30-1.33 | 13.0-13.3 | 907-947 | 11.4-11.9 | ≥1353 | ≥17 | 318-334 | 40-42 | ≤120 |
N44H | 1.33-1.36 | 13.3-13.6 | 907-947 | 11.4-11.9 | ≥1274 | ≥16 | 334-350 | 42-44 | ≤110 |
N30SH | 1.08-1.12 | 10.8-11.2 | 804-844 | 10.1-10.6 | ≥1592 | ≥20 | 223-239 | 28-30 | ≤150 |
N33SH | 1.14-1.17 | 11.4-11.7 | 820-876 | 10.3-11.0 | ≥1592 | ≥20 | 247-263 | 31-33 | ≤150 |
N35SH | 1.17-1.21 | 11.7-12.1 | 860-907 | 10.8-11.4 | ≥1592 | ≥20 | 263-279 | 33-35 | ≤150 |
N38SH | 1.22-1.26 | 12.2-12.6 | 907-947 | 11.4-11.9 | ≥1592 | ≥20 | 287-303 | 36-38 | ≤150 |
N40SH | 1.26-1.29 | 12.6-12.9 | 907-947 | 11.4-11.9 | ≥1592 | ≥20 | 303-318 | 38-40 | ≤150 |
N42SH | 1.30-1.33 | 13.0-13.3 | 907-947 | 11.4-11.9 | ≥1512 | ≥19 | 318-334 | 40-42 | ≤140 |
N28UH | 1.04-1.08 | 10.4-10.8 | 780-812 | 9.8-10.2 | ≥1990 | ≥25 | 207-223 | 26-28 | ≤180 |
N30UH | 1.08-1.12 | 10.8-11.2 | 804-844 | 10.1-10.6 | ≥1990 | ≥25 | 223-239 | 28-30 | ≤180 |
N33UH | 1.14-1.17 | 11.4-11.7 | 820-876 | 10.3-11.0 | ≥1990 | ≥25 | 247-263 | 31-33 | ≤180 |
N35UH | 1.17-1.21 | 11.7-12.1 | 860-907 | 10.8-11.4 | ≥1990 | ≥25 | 263-279 | 33-35 | ≤180 |
N38UH | 1.22-1.26 | 12.2-12.6 | 860-907 | 10.8-11.4 | ≥1990 | ≥25 | 287-303 | 36-38 | ≤180 |
N40UH | 1.26-1.29 | 12.6-12.9 | 860-907 | 10.8-11.4 | ≥1990 | ≥25 | 289-303 | 38-40 | ≤180 |
N28EH | 1.04-1.08 | 10.4-10.8 | 780-812 | 9.8-10.2 | ≥2388 | ≥30 | 207-223 | 26-28 | ≤200 |
N30EH | 1.08-1.12 | 10.8-11.2 | 804-844 | 10.1-10.6 | ≥2388 | ≥30 | 223-239 | 28-30 | ≤200 |
N33EH | 1.14-1.17 | 11.4-11.7 | 820-876 | 10.3-11.0 | ≥2388 | ≥30 | 247-263 | 31-33 | ≤200 |
N35EH | 1.17-1.21 | 11.7-12.1 | 860-907 | 10.8-11.4 | ≥2388 | ≥30 | 263-279 | 33-35 | ≤200 |
N38EH | 1.22-1.26 | 12.2-12.6 | 860-907 | 10.8-11.4 | ≥2388 | ≥30 | 287-303 | 36-38 | ≤200 |
Note: The Max Working Tem. Is tested under 20℃±2℃, the inevitable loss of magnetic force is no more than 5%.
More about NdFeB rare earth magnets
Neodymium Iron Boron (NdFeB) magnets, of the Rare Earth class, have been commercially available since the mid -1980's. Their popularity has grown rapidly due to their high Maximum Energy Product and their wide range of available shapes, sizes, and grades.
NdFeB magnets can be manufactured by sintering, compression bonding, injection molding, and extrusion. The sintered form holds the highest energy product of up to 48MGOe, while the bonded form holds a lower energy product of up to 10MGOe. The majority of NdFeB magnets are anisotropic and can only be magnetized in the orientation direction. In general, magnetizing fields of approximately 30KOe are required to saturate NdFeB magnets.
These magnets are prone to corrosion in humid environments. For this, liquid epoxy, dry epoxy, nickel plating, zinc plating, and combinations of these coatings may be used as a protective measure.
Bonded NdFeB magnets are produced by binding rapid-quenching Nd-Fe-B powders which is mixed with plastic resin to form a magnet by compression molding with epoxy and injection molding with nylon. The injection molding has particularly useful feature in molding very complicated shapes and thin walled parts. The compression molded magnets are limited for simple geometries, but they can offer higher magnetic strength than injection molded magnets because of relative high density. Bonded NdFeB have lower energy properties compared with sintered NdFeB. However, it can be produced with high dimension accuracy and shape complexity. Normally, there is no finishing required for bonded NdFeB. In order to prevent corrosion, the magnet surfaces are treated by epoxy coating or nickel plating.
Typical Magnetic Performance Range for Bonded NdFeB MagnetsGrade | Br | Hcb | Hcj | BHmax | Density | Tw Max | ||||
---|---|---|---|---|---|---|---|---|---|---|
kGs | mT | kOe | kA/m | kOe | kA/m | KJ/m3 | MGOe | g/cm3 | ℃ | |
BN-2 | 3.50 | 350 | 2.5 | 200 | 7.0 | 560 | 20 | 2.5 | 4.8 | 160 |
BN-4 | 4.50 | 450 | 3.5 | 280 | 8.0 | 640 | 40 | 5.0 | 5.5 | 160 |
BN-6 | 5.50 | 550 | 4.5 | 360 | 8.0 | 640 | 52 | 6.5 | 5.8 | 160 |
BN-8 | 6.50 | 650 | 5.0 | 400 | 9.0 | 720 | 64 | 8.0 | 6.0 | 160 |
BN-8H | 6.30 | 630 | 5.5 | 440 | 15.0 | 560 | 64 | 8.0 | 6.0 | 160 |
BN-8SR | 6.30 | 630 | 5.5 | 440 | 12.0 | 560 | 64 | 8.0 | 6.0 | 180 |
BN-8L | 6.50 | 650 | 5.5 | 440 | 9.0 | 560 | 68 | 8.5 | 6.0 | 160 |
BN-10 | 7.00 | 700 | 5.5 | 440 | 9.0 | 560 | 80 | 10.0 | 6.0 | 160 |
BN-10H | 7.30 | 730 | 5.5 | 440 | 9.0 | 560 | 84 | 10.5 | 6.2 | 160 |
BN-12 | 7.50 | 750 | 6.0 | 480 | 10.0 | 560 | 92 | 11.5 | 6.2 | 160 |
BN-12D | 7.50 | 750 | 6.0 | 480 | 10.0 | 560 | 92 | 11.5 | 6.2 | 170 |
BN-12L | 7.80 | 780 | 5.5 | 440 | 7.0 | 560 | 92 | 11.5 | 6.2 | 150 |
BN-13L | 8.00 | 800 | 5.5 | 440 | 7.0 | 560 | 96 | 12.0 | 6.3 | 150 |