Products

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.

Sintered NdFeB Rare Earth Magnets Properties
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 Magnets
Grade 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