Neodymium Iron Boron (NdFeB) magnets, of the Rare Earth class, are made from the alloys neodymium, iron and boron and are the most commonly used rare-earth magnets. They have been commercially available since the mid -1980's. Neodymium magnets’ popularity has grown rapidly due to their high Maximum Energy Product and its wide range of available shapes, sizes, and grades.
Neodymium magnets can be manufactured by sintering, compression bonding, injection molding, and extrusion. The sintered form holds the highest energy product of up to 52 MGOe, while the bonded form holds a lower energy product of up to 10 MGOe. The majority of neodymium magnets are anisotropic and can only be magnetized in the direction of orientation.
View Grades & Properties Table
Applications of Neodymium Magnets
- Magnetic Separators
- Wind Turbines
- Linear actuators
- Microphone assemblies
- Servo motors
- Tape recorders
- Alternators
- Pacemakers
- DC motors (automotive starters)
- Flow meters
- Headphones
- Magnetic bearings
- Switches
Sizes & Shapes of Neodymium Magnets
Magnetic Hold develops custom neodymium magnets in a variety of shapes and sizes:
- Arc
- Bar
- Rod
- Disc
- Horseshoe
- Channel
- Block
- Ring
- Sphere
- Cylinders
- Plugs
Custom Neodymium Magnets
Magnetic Hold is a leading manufacturer of custom neodymium magnets. Our team can supply all grades of neodymium magnets, custom shapes, sizes, and coatings. Contact us today for neodymium magnets in any shape or any size!Neodymium Magnet Plating & Coating Options
Neodymium magnets are prone to corrosion in humid environments. For protective measures for corrosion resistance, Magnetic Hold offers nickel, black nickel, chemical nickel,nickel + epoxy, zinc, silver, gold plating.
We also offer the following coating options, epoxy, phosphate, phosphate + parylene, phosphate + teflon, and plastic.
To find out more information, request a quote through our online form. For custom shapes and sizes, please send a drawing or sketch. If one is not available, we can work with you to create your custom magnets.
Magnetism Direction Options
We can offer several different magnetization directions, see below schematics. Their availability is limited to size. Magnetization fixture cost may apply for large and custom magnets with magnetization other than what is shown below
The table below offers some guidelines for selecting a grade that will best suit your application.
Hc: Coercive Force
Oe: Oersted
˚C: Degree Celcius
MGOe: Mega Gauss Oersted
Standard Tolerances (inches);
All shapes and sizes (±0.005)
NEODYMIUM MAGNET GRADES & PROPERTIES
| Grade | Residual Induction Br (max) [KGa] | Max Energy Product BH (max) MGOe | Coercive Force Hcb KOe | Curie Temp. [˚C] | Temp. Coe of Br [%/˚C) | Max. Practical Operating Temp. [˚C] |
|---|---|---|---|---|---|---|
| N30 | 10.8-11.3 | 28-31 | ≥10.0 | 310 | -0.11 | 80 |
| N35 | 11.7-12.2 | 33-36 | ≥10.9 | 310 | -0.11 | 80 |
| N38 | 12.2-12.5 | 36-39 | ≥11.3 | 310 | -0.11 | 80 |
| N40 | 12.5-12.8 | 38-41 | ≥11.4 | 310 | -0.11 | 80 |
| N42 | 12.8-13.2 | 40-43 | ≥11.5 | 310 | -0.11 | 80 |
| N45 | 13.2-13.8 | 43-46 | ≥11.6 | 310 | -0.11 | 80 |
| N48 | 13.8-14.2 | 46-49 | ≥11.6 | 310 | -0.11 | 80 |
| N50 | 14.0-14.5 | 48-51 | ≥10.0 | 310 | -0.11 | 80 |
| N52 | 14.3-14.8 | 50-53 | ≥10.5 | 310 | -0.11 | 80 |
| N55 | 14.5-15.0 | 51-55 | ≥10.5 | 310 | -0.11 | 80 |
| N30M | 10.8-11.3 | 28-31 | ≥10.0 | 310 | -0.11 | 100 |
| N35M | 11.7-12.2 | 33-36 | ≥10.9 | 310 | -0.11 | 100 |
| N38M | 12.2-12.5 | 36-39 | ≥11.3 | 310 | -0.11 | 100 |
| N40M | 12.5-12.8 | 38-41 | ≥11.6 | 310 | -0.11 | 100 |
| N42M | 12.8-13.2 | 40-43 | ≥12.0 | 310 | -0.11 | 100 |
| N45M | 13.2-13.8 | 43-46 | ≥12.5 | 310 | -0.11 | 100 |
| N48M | 13.6-14.3 | 46-49 | ≥12.9 | 310 | -0.11 | 100 |
| N50M | 14.0-14.5 | 47-51 | ≥13.1 | 310 | -0.11 | 100 |
| N52M | 14.2-14.8 | 49-53 | ≥13.1 | 310 | -0.11 | 100 |
| N30H | 10.8-11.3 | 28-31 | ≥10.0 | 330 | -0.11 | 120 |
| N35H | 11.7-12.2 | 33-36 | ≥10.9 | 330 | -0.11 | 120 |
| N38H | 12.2-12.5 | 36-39 | ≥11.3 | 330 | -0.11 | 120 |
| N40H | 12.5-12.8 | 38-41 | ≥11.6 | 330 | -0.11 | 120 |
| N42H | 12.8-13.2 | 40-43 | ≥12.0 | 330 | -0.11 | 120 |
| N45H | 13.2-13.8 | 43-46 | ≥12.1 | 330 | -0.11 | 120 |
| N48H | 13.7-14.3 | 46-49 | ≥12.5 | 330 | -0.11 | 120 |
| N50H | 14.0-14.5 | 47-51 | ≥12.8 | 330 | -0.11 | 120 |
| N52H | 14.2-14.8 | 50-54 | ≥12.8 | 330 | -0.11 | 120 |
| N30SH | 10.8-11,3 | 28-31 | ≥10.1 | 340 | -0.11 | 150 |
| N35SH | 11.7-12.2 | 33-36 | ≥11.0 | 340 | -0.11 | 150 |
| N38SH | 12.2-12.5 | 36-39 | ≥11.4 | 340 | -0.11 | 150 |
| N40SH | 12.5-12.8 | 38-41 | ≥11.8 | 340 | -0.11 | 150 |
| N42SH | 12.8-13.2 | 40-43 | ≥12.4 | 340 | -0.11 | 150 |
| N45SH | 13.2-13.8 | 43-46 | ≥12.6 | 340 | -0.11 | 150 |
| N48SH | 13.6-14.0 | 43-47 | ≥11.5 | 340 | -0.11 | 150 |
| N50SH | 13.9-14.2 | 48-51 | ≥13.1 | 340 | -0.11 | 150 |
| N30UH | 10.8-11.3 | 28-31 | ≥10.2 | 350 | -0.11 | 180 |
| N35UH | 11.8-12.2 | 33-36 | ≥10.8 | 350 | -0.11 | 180 |
| N38UH | 12.2-12.5 | 36-39 | ≥11.0 | 350 | -0.11 | 180 |
| N40UH | 12.5-12.8 | 38-41 | ≥11.3 | 350 | -0.11 | 180 |
| N42UH | 12.8-13.5 | 40-43 | ≥11.0 | 350 | -0.11 | 180 |
| N45UH | 13.2-13.8 | 42-46 | ≥11.0 | 350 | -0.11 | 180 |
| N48UH | 13.6-14.0 | 46-49 | ≥12.9 | 350 | -0.11 | 180 |
| N30EH | 10.8-11.3 | 28-31 | ≥10.2 | 360 | -0.11 | 200 |
| N35EH | 11.7-12.2 | 33-36 | ≥11.0 | 360 | -0.11 | 200 |
| N38EH | 12.2-12.5 | 36-39 | ≥11.3 | 360 | -0.11 | 200 |
| N40EH | 12.8-12.8 | 38-41 | ≥11.8 | 360 | -0.11 | 200 |
| N42EH | 12.8-13.2 | 40-44 | ≥12.5 | 360 | -0.11 | 200 |
| N45EH | 13.2-13.6 | 43-46 | ≥12.5 | 360 | -0.11 | 200 |
| N30AH | 10.8-11.3 | 28-31 | ≥10.2 | 360 | -0.11 | 220 |
| N35AH | 11.7-12.1 | 33-37 | ≥11.0 | 360 | -0.11 | 220 |
Br: Residual Induction
Gs: Gauss
Caution!
Extreme caution must be taken when working with rare earth magnets. Magnets larger than a few centimeters are strong enough to cause injuries to body parts pinched between two magnets, or a magnet and a metal surface, even causing broken bones. Magnets allowed to get too close to each other can strike one another with force to chip and shatter the brittle material, and the flying chips can cause injuries.