Materials and Grades
The material and grade of a magnet refer to a set of properties that ultimately yield the magnet's performance. The majority of the magnets sold by Amazing Magnets are Neodymium Iron Boron (NdFeB), and most of our stock products are Grade N40 . Other common materials such as SmCo, AlNiCo, and Ferrite magnets are also listed as these can be produced to order as custom magnets.
If you have any questions feel free to give us a call (512-678-2940).
| Type of Magnet | Characteristics |
|---|---|
| Neodymium Iron Boron (NdFeB) | Strongest permanent magnet material commercially available. Plated to avoid oxidization. |
| Samarium Cobalt (SmCo) | Strong magnets, but not as strong as NdFeB magnets. Higher maximum operating temperature than NdFeB magnets. |
| Bonded Neodymium Iron Boron (NdFeB) | Cast or molded NdFeB suspended in an epoxy resin. Lower strength than SmCo, but can be made flexible. Requires mold tooling. |
| Ferrite (Ceramic) | Hard and highly brittle. Maintains magnetism in high operating temperatures. Highly resistant to corrosion. Weaker than NdFeB magnets. |
| Flexible (Rubberized) | Ferrite magnetic powder suspended in a rubber resin. Corrosion-resistant and flexible. Magnetic field is easily disrupted and altered by stronger magnets. |
Terms & Definitions
Br (KG)
Residual Flux Density
Measured in Kilo Gauss
This is a measurement of the material’s ability to retain a magnetic field after being magnetized.
Example: Iron can be temporarily magnetized but will lose the majority of its magnetic strength when the external field is taken away. This is because Iron has a low Residual Flux Density.
HcB (KOe)
External Force Required to Demagnetize
Measured in Kilo Oersteds
This is a measurement of the material’s ability to resist external and internal magnetic forces without being changed.
Example: Flexible/rubberized magnets have a lower HcB and can therefore be easily demagnetized or remagnetized by a stronger neodymium magnet.
BHMax (MGOe)
Maximum Energy Product
Measured in Mega Gauss Oersteds
This is a direct measurement of a material’s maximum magnetic strength after the magnet is fully saturated or “charged” by an external magnetic field. BHMax is the best indication of a given material’s attractive power.
Tmax
Maximum Operating Temperature
Measured in Celsius / Fahrenheit
Heating a magnet above its maximum operating temperature will cause it to permanently lose its magnetism until it is remagnetized by a strong external field. Heating the material close to the maximum operating temperature (usually within the 20% range) will cause the magnet to temporarily lose its magnetic strength until it cools.
Sintered Neodymium Iron Boron (NdFeB)
Sintered NdFeB magnets are strong permanent magnets made of an alloy of neodymium, Iron, and Boron. NdFeB Magnets are the strongest available magnets but have a low maximum temperature resistance. NeFeB Magnets Will oxidize rapidly, so an anti-corrosive coating is needed to protect the substrate. See Plating and Coating options for more information.
| Grade Name | Br (KG) | HcB (KOe) | Hci (KOe) | BHmax(MGOe) | Tmax |
| N35 | 11.8-12.2 | ≥10.9 | ≥12.0 | 33-36 | 80C / 176F |
| N38 | 12.2-12.6 | ≥11.3 | ≥12.0 | 36-39 | 80C / 176F |
| N40 | 12.6-12.9 | ≥11.4 | ≥12.0 | 38-41 | 80C / 176F |
| N42 | 12.9-13.3 | ≥11.5 | ≥12.0 | 40-43 | 80C / 176F |
| N45 | 13.3-13.7 | ≥11.0 | ≥12.0 | 43-46 | 80C / 176F |
| N48 | 13.7-14.1 | ≥10.5 | ≥11.0 | 45-49 | 80C / 176F |
| N50 | 14.0-14.5 | ≥10.5 | ≥11.0 | 47-51 | 80C / 176F |
| N52 | 14.3-14.8 | ≥10.5 | ≥11.0 | 49-53 | 80C / 176F |
| N55 | 14.7-15.1 | ≥10.5 | ≥11.0 | 53-56 | 80C / 176F |
| 35M | 11.8-12.2 | ≥10.9 | ≥14.0 | 34-36 | 100C / 212F |
| 38M | 12.2-12.6 | ≥11.3 | ≥14.0 | 36-39 | 100C / 212F |
| 40M | 12.6-12.9 | ≥11.6 | ≥14.0 | 38-41 | 100C / 212F |
| 42M | 12.9-13.3 | ≥12.0 | ≥14.0 | 40-43 | 100C / 212F |
| 45M | 13.3-13.7 | ≥12.5 | ≥14.0 | 43-46 | 100C / 212F |
| 48M | 13.7-14.1 | ≥12.9 | ≥14.0 | 45-49 | 100C / 212F |
| 50M | 14.0-14.5 | ≥13.0 | ≥14.0 | 47-51 | 100C / 212F |
| 55M | 14.3-14.7 | ≥13.0 | ≥14.0 | 50-53 | 100C / 212F |
| 30H | 10.8-11.3 | ≥10.0 | ≥17.0 | 28-31 | 120C / 248F |
| 33H | 11.3-11.7 | ≥10.5 | ≥17.0 | 31-34 | 120C / 248F |
| 35H | 11.8-12.2 | ≥10.9 | ≥17.0 | 33-36 | 120C / 248F |
| 38H | 12.2-12.6 | ≥11.3 | ≥17.0 | 36-39 | 120C / 248F |
| 40H | 12.6-12.8 | ≥11.6 | ≥17.0 | 38-41 | 120C / 248F |
| 42H | 12.9-13.3 | ≥12.0 | ≥17.0 | 40-43 | 120C / 248F |
| 45H | 13.3-13.7 | ≥12.3 | ≥17.0 | 43-46 | 120C / 248F |
| 48H | 13.7-14.1 | ≥12.5 | ≥17.0 | 46-49 | 120C / 248F |
| 50H | 14.0-14.3 | ≥13.3 | ≥17.0 | 47-50 | 120C / 248F |
| 52H | 14.3-14.7 | ≥13.5 | ≥17.0 | 50-53 | 120C / 248F |
| 30SH | 10.8-11.3 | ≥10.1 | ≥20.0 | 28-31 | 150C / 302F |
| 33SH | 11.3-11.7 | ≥10.6 | ≥20.0 | 31-34 | 150C / 302F |
| 35SH | 11.8-12.2 | ≥11.0 | ≥20.0 | 33-36 | 150C / 302F |
| 38SH | 12.2-12.6 | ≥11.4 | ≥20.0 | 36-39 | 150C / 302F |
| 40SH | 12.6-12.9 | ≥11.6 | ≥20.0 | 38-41 | 150C / 302F |
| 42SH | 12.9-13.3 | ≥12.4 | ≥20.0 | 40-43 | 150C / 302F |
| 45SH | 13.2-13.7 | ≥12.6 | ≥20.0 | 42-46 | 150C / 302F |
| 48SH | 13.6-14.0 | ≥13.0 | ≥20.0 | 46-49 | 150C / 302F |
| 50SH | 14.0-14.5 | ≥13.5 | ≥20.0 | 48-51 | 150C / 302F |
| G52SH | 14.2-14.5 | ≥13.7 | ≥24.0 | 49-52 | 150C / 302F |
| G54SH | 14.4-14.8 | ≥13.9 | ≥24.0 | 51-54 | 150C / 302F |
| 28UH | 10.4-10.8 | ≥9.6 | ≥25.0 | 26-29 | 180C / 356F |
| 30UH | 10.8-11.4 | ≥10.1 | ≥25.0 | 28-31 | 180C / 356F |
| 33UH | 11.4-11.8 | ≥10.7 | ≥25.0 | 31-34 | 180C / 356F |
| 35UH | 11.8-12.2 | ≥10.8 | ≥25.0 | 33-36 | 180C / 356F |
| 38UH | 12.2-12.6 | ≥11.3 | ≥25.0 | 36-39 | 180C / 356F |
| 40UH | 12.5-12.9 | ≥11.3 | ≥25.0 | 38-41 | 180C / 356F |
| 42UH | 12.8-13.3 | ≥11.6 | ≥25.0 | 40-43 | 180C / 356F |
| 45UH | 13.2-13.6 | ≥13.0 | ≥25.0 | 43-46 | 180C / 356F |
| G45UH | 13.3-13.6 | ≥13.0 | ≥26.0 | 43-46 | 180C / 356F |
| G48UH | 13.7-14.7 | ≥13.3 | ≥26.0 | 47-50 | 180C / 356F |
| G50UH | 13.9-14.3 | ≥13.5 | ≥26.0 | 47-51 | 180C / 356F |
| G52UH | 14.2-14.5 | ≥13.7 | ≥26.0 | 49-52 | 180C / 356F |
| G54UH | 14.4-14.8 | ≥13.9 | ≥25.0 | 51-54 | 180C / 356F |
| 28EH | 10.4-10.9 | ≥9.8 | ≥30.0 | 26-29 | 200C / 392F |
| 30EH | 10.8-11.4 | ≥10.1 | ≥30.0 | 28-31 | 200C / 392F |
| 33EH | 11.4-11.8 | ≥10.3 | ≥30.0 | 31-34 | 200C / 392F |
| 35EH | 11.8-12.2 | ≥10.5 | ≥30.0 | 33-36 | 200C / 392F |
| 38EH | 12.2-12.6 | ≥11.3 | ≥30.0 | 36-39 | 200C / 392F |
| 40EH | 12.6-12.9 | ≥11.6 | ≥30.0 | 38-41 | 200C / 392F |
| G42EH | 12.9-13.3 | ≥12.7 | ≥30.0 | 40-43 | 200C / 392F |
| G45EH | 13.3-13.6 | ≥13.0 | ≥30.0 | 43-46 | 200C / 392F |
| G48EH | 13.7-14.1 | ≥13.3 | ≥30.0 | 50-47 | 200C / 392F |
| 28AH | 10.4-10.9 | ≥9.8 | ≥35.0 | 26-29 | 230C / 446F |
| 30AH | 10.8-11.3 | ≥10.1 | ≥35.0 | 28-31 | 230C / 446F |
| 33AH | 11.3-11.8 | ≥10.3 | ≥33.0 | 31-34 | 230C / 446F |
| 35AH | 11.8-12.2 | ≥10.5 | ≥33.0 | 33-36 | 230C / 446F |
| 38AH | 12.2-12.6 | ≥11.0 | ≥35.0 | 36-39 | 230C / 446F |
| G42AH | 12.9-13.3 | ≥12.9 | ≥35.0 | 40-43 | 230C / 446F |
| G45AH | 13.3-13.7 | ≥13.0 | ≥35.0 | 43-46 | 230C / 446F |
Samarium Cobalt (SmCo)
SmCo magnets are made of a strong permanent magnet alloy of samarium and cobalt. Compared to NdFeB magnets, SmCo magnets are weaker but are more suitable for working in higher temperatures. SmCo magnets are very anti-corrosive and generally do not require electroplated surface treatment
| Grade Name | Br (KG) | HcB (KOe) | Hci (KOe) | BHmax(MGOe) | Tmax |
| YX18 | 8.5-9.0 | ≥7.8-8.2 | ≥15-19 | 16-18 | 250C / 482F |
| YX20 | 9.2-9.6 | ≥8.2-9.0 | ≥15-19 | 19-21 | 250C / 482F |
| YX24 | 9.6-10.0 | ≥9.2-9.7 | ≥15-19 | 22-24 | 250C / 482F |
| YXH24 | 9.5-10.2 | ≥8.0-9.2 | ≥18-25 | 22-24 | 300C / 572F |
| YXG26 | 10.2-10.5 | ≥9.4-10.0 | ≥18-25 | 24-26 | 300C / 572F |
| YXG28 | 10.5-10.8 | ≥9.5-10.0 | ≥18-25 | 26-28 | 300C / 572F |
| YXG28B | 10.2-11.0 | ≥5.2-6.5 | ≥5.5-6.5 | 26-28 | 300C / 572F |
| YXG30 | 10.8-11.0 | ≥9.8-10.5 | ≥18-25 | 28-30 | 300C / 572F |
| YXG30B | 10.8-11.0 | ≥5.2-5.6 | ≥5.5-6.5 | 28-30 | 300C / 572F |
Bonded Neodymium Iron Boron (NdFeB)
Bonded NdFeB is a cast/molded type of NdFeB that can be further machined and pressed into different shapes like rings, arcs, and many more complex geometries. It also has a higher corrosion resistance compared with sintered NdFeB. Bonded magnets offer less magnetic strength than sintered magnets s but can be formed into intricately shaped parts.
| Grade Name | Br (KG) | HcB (KOe) | Hci (KOe) | BHmax(MGOe) | Tmax |
| BDM-4 | 3.5-4.5 | ≥3.0-3.5 | ≥8-10 | 3-4 | 120C / 248F |
| BDM-6 | 5.0-6.0 | ≥4.0-4.5 | ≥8-10 | 5-7 | 120C / 248F |
| BDM-8 | 5.5-6.5 | ≥4.5-5.0 | ≥12-14 | 5-8.5 | 150C / 302F |
| BDM-10 | 6.5-7.0 | ≥5.0-5.5 | ≥8-10 | 9-10 | 150C / 302F |
| BDM-12 | 7.0-8.0 | ≥5.5-6.0 | ≥9-11 | 10-12 | 80C / 176F |
| BDM-L | 7.0-8.0 | ≥2.0-2.5 | ≥2.2-3.0 | 4.5-6.5 | 80C / 176F |
Aluminum Nickel Cobalt (AlNiCo)
AlNiCo magnets are very stable and have good corrosion resistance and a typical hardness of 50 Rockwell C. AlNiCo represents the most versatile magnet material available. The range of properties can be accurately designed for specific applications by changes to element analysis and heat treatment.
| Grade Name | Br (KG) | HcB (KOe) | BHmax(MGOe) | Tmax |
| LN9 | 6.8 | ≥0.38 | 1.13 | 450C / 842F |
| LN10 | 6.0 | ≥0.5 | 1.2 | 450C / 842F |
| LNG12 | 7.2 | ≥0.5 | 1.55 | 450C / 842F |
| LNG13 | 7.0 | ≥0.6 | 1.6 | 450C / 842F |
| LNG34 | 12.0 | ≥0.6 | 4.3 | 525C / 977F |
| LNG37 | 12.0 | ≥0.6 | 4.65 | 525C / 977F |
| LNG40 | 12.5 | ≥0.6 | 5.0 | 525C / 977F |
| LNG44 | 12.5 | ≥0.65 | 5.5 | 525C / 977F |
| LNG52 | 13.0 | ≥0.7 | 6.5 | 525C / 977F |
| LNGT28 | 10.0 | 0.72 | 3.5 | 550C / 1022F |
| LNGT36J | 7.0 | 1.75 | 4.5 | 550C / 1022F |
| LNGT32 | 8.0 | 1.25 | 4.0 | 550C / 1022F |
| LNGT40 | 8.0 | 1.38 | 5.0 | 550C / 1022F |
| LNGT60 | 9.0 | 1.38 | 7.5 | 550C / 1022F |
| LNGT72 | 1.05 | 1.4 | 9.0 | 550C / 1022F |
Ferrite (Ceramic)
Ceramic, also known as Ferrite magnets are made of a composite of iron oxide and barium/strontium carbonate by ceramic processing technology. Ferrites are, like most other ceramics, hard and brittle. In terms of the magnetic properties, ferrites are often classified as “soft” and “hard” which refers to their low or high coercivity of their magnetism, respectively.
| Grade Name | Br (KG) | HcB (KOe) | Hci (KOe) | BHmax(MGOe) | Tmax |
| C1 | 2.00-2.35 | 1.61-2.01 | 2.64-3.52 | 0.80-1.20 | 250C / 482F |
| C5 | 3.70-4.00 | 2.20-2.64 | 2.26-2.76 | 3.30-3.80 | 250C / 482F |
| C7 | 3.60-3.80 | 3.30-3.62 | 4.00-4.40 | 3.00-3.50 | 250C / 482F |
| C8 | 3.80-4.00 | 2.89-3.46 | 2.95-3.64 | 3.40-4.00 | 250C / 482F |
| C8B | 4.10-4.30 | 2.76-3.14 | 2.83-3.20 | 4.00-4.40 | 250C / 482F |
Flexible (Rubber)
Flexible Rubber magnets are made by mixing Ferrite or Neodymium magnet powders and synthetic or natural rubber binders. They are made by rolling (calendaring) or extrusion methods. Flexible magnets are applied because of their advantages of versatility, low cost, and ease of use. These magnets are usually manufactured in strip or sheet form that is widely used in micro-motors, gaskets, novelties, signs, and displays.
| Grade Name | Br (KG) | HcB (KOe) | Hci (KOe) | BHmax(MGOe) | Tmax |
| FRM-5 | 1.55-1.75 | 1.25-1.45 | 1.55-1.75 | 0.60-0.70 | 80C / 176F |
| FRM-6 | 1.6-1.8 | 1.3-1.5 | 1.60-1.80 | 0.65-0.75 | 80C / 176F |
| FRM-8 | 2.15-2.25 | 1.6-1.8 | 1.90-2.10 | 0.95-1.05 | 80C / 176F |
| FRM-11 | 2.4-2.5 | 1.65-1.85 | 1.75-1.95 | 1.35-1.45 | 80C / 176F |
| FRM-12 | 2.45-2.5 | 2.0-2.2 | 2.70-2.90 | 1.45-1.55 | 80C / 176F |