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 the neodymium magnets are anisotropic and can only be magnetized in the orientation direction.
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
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
Neodymium Magnet Plating Options
Neodymium magnets are prone to corrosion in humid environments. For protective measures for corrosion resistance, Magnetic Hold offers nickel, zinc, tin, silver, gold plating and spray coating epoxy resin.
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.
The table below offers some guidelines for selecting a grade that will best suit your application.
Neodymium Magnet Grades & Properties
| Grade | Br Residual Induction kGs | Hcb Coercive Force kOe | Hcj Intrinsic Coercive Force kOe | (BH)max Max Energy Product MGOe | Max. Practical Operating Temp. ˚F |
|---|---|---|---|---|---|
| N35 | 11.7-12.2 | 10.9 | 12 | 33-36 | 176 |
| N38 | 12.2-12.5 | 11.3 | 12 | 36-39 | 176 |
| N40 | 12.5-12.8 | 11.4 | 12 | 38-41 | 176 |
| N42 | 12.8-13.2 | 11.5 | 12 | 40-43 | 176 |
| N45 | 13.2-13.8 | 11.6 | 12 | 43-46 | 176 |
| N48 | 13.8-14.2 | 11.6 | 12 | 46-49 | 176 |
| N50 | 14.0-14.5 | 11.0 | 12 | 48-51 | 176 |
| N52 | 14.3-14.8 | 10.5 | 11 | 50-53 | 176 |
| N38M | 12.2-12.5 | 11.3 | 14 | 36-39 | 212 |
| N40M | 12.5-12.8 | 11.6 | 14 | 38-41 | 212 |
| N42M | 12.8-13.2 | 12.0 | 14 | 40-43 | 212 |
| N45M | 13.2-13.8 | 12.5 | 14 | 43-46 | 212 |
| N48M | 13.6-14.3 | 12.9 | 14 | 46-49 | 212 |
| N50M | 14.0-14.5 | 13.0 | 14 | 48-51 | 212 |
| N52M | 14.2-14.8 | 13.3 | 14 | 49-53 | 212 |
| N38H | 12.2-12.5 | 11.3 | 17 | 36-39 | 248 |
| N40H | 12.5-12.8 | 11.6 | 17 | 38-41 | 248 |
| N42H | 12.8-13.2 | 12.0 | 17 | 40-43 | 248 |
| N45H | 13.2-13.8 | 12.3 | 17 | 43-46 | 248 |
| N48H | 13.7-14.3 | 12.5 | 16 | 46-49 | 248 |
| N50H | 14.0-14.5 | 12.9 | 16 | 47-51 | 248 |
| N33SH | 11.3-11.7 | 10.6 | 20 | 31-34 | 302 |
| N35SH | 11.7-12.2 | 11.0 | 20 | 33-36 | 302 |
| N38SH | 12.2-12.5 | 11.4 | 20 | 36-39 | 302 |
| N40SH | 12.5-12.8 | 11.8 | 20 | 38-41 | 302 |
| N42SH | 12.8-13.2 | 12.1 | 20 | 40-43 | 302 |
| N45SH | 13.2-13.8 | 12.3 | 20 | 43-46 | 302 |
| N46SH | 13.4-14.0 | 12.5 | 20 | 43-47 | 302 |
| N33UH | 11.3-11.7 | 10.7 | 25 | 31-34 | 356 |
| N35UH | 11.8-12.2 | 10.8 | 25 | 33-36 | 356 |
| N38UH | 12.2-12.5 | 11.3 | 25 | 36-39 | 356 |
| N40UH | 12.5-12.8 | 11.8 | 25 | 38-41 | 356 |
| N42UH | 12.8-13.5 | 12.1 | 25 | 40-43 | 356 |
| N30EH | 10.8-11.3 | 10.2 | 30 | 28-31 | 392 |
| N33EH | 11.3-11.7 | 10.5 | 30 | 31-34 | 392 |
| N35EH | 11.7-12.2 | 11.0 | 30 | 33-36 | 392 |
| N38EH | 12.2-12.5 | 11.3 | 30 | 36-39 | 392 |
| N28AH | 10.4-10.9 | 9.7 | 35 | 26-29 | 446 |
| N30AH | 10.8-11.3 | 10.2 | 35 | 28-31 | 446 |
| N33AH | 11.3-11.7 | 10.5 | 35 | 31-34 | 446 |
| N35SHT | 11.7-12.1 | 10.8 | 22.5 | 33-36 | 320 |
| N38SHT | 12.2-12.5 | 11.3 | 22.5 | 36-39 | 320 |
| N40SHT | 12.2-12.5 | 11.4 | 22.5 | 38-41 | 320 |
| N42SHT | 12.5-12.8 | 11.8 | 22.5 | 40-43 | 320 |
| N45SHT | 12.8-13.2 | 12.4 | 22.5 | 43-46 | 320 |
| N35UHT | 11.8-12.2 | 10.8 | 27 | 33-36 | 374 |
| N38UHT | 12.2-12.5 | 11.3 | 27 | 36-39 | 374 |
| N40UHT | 12.5-12.8 | 11.8 | 27 | 38-41 | 374 |
| N42UHT | 12.8-13.5 | 12.1 | 26 | 40-43 | 374 |
| N30EHT | 10.8-11.3 | 10.2 | 33 | 28-31 | 410 |
| N33EHT | 11.3-11.7 | 10.5 | 33 | 31-34 | 410 |
| N35EHT | 11.7-12.2 | 11.0 | 33 | 33-36 | 410 |
| N38EHT | 12.2-12.5 | 11.3 | 31 | 36-39 | 410 |
Br: Residual Induction
Gs: Gauss
Hc: Coercive Force
Oe: Oersted
Bd Hd: Maximum Energy Product
˚F: Degree Fahrenheit
Standard Tolerances (inches);
All shapes and sizes (±0.005)
Magnetism Direction Options
- Square and rectangular Sintered Neodymium magnets can be magnetized with two poles ("N" & "S") thru the length, width, thickness and with multiple poles.
- Round Sintered Neodymium magnet can be magnetized with two poles ("N" & "S") the thickness, diametrically and with multiple poles.
- Ring Sintered Neodymium magnet can be magnetized with two poles ("N" & "S") thru the thickness, diametrically and with multi poles. Contact us for magnetism direction of irregular shapes.
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.