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 (888-727-3327).

Type of Magnet Characteristics
Strongest permanent magnet material commercially available. Plated to avoid oxidization.
Strong magnets, but not as strong as NdFeB magnets. Higher maximum operating temperature than NdFeB magnets.
Cast or molded NdFeB suspended in an epoxy resin. Lower strength than SmCo, but can be made flexible. Requires mold tooling.
Hard and highly brittle. Maintains magnetism in high operating temperatures. Highly resistant to corrosion. Weaker than NdFeB magnets.
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. View Selection

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 ≥13.7 ≥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 2.3 1.86 3.5 1.05 250C / 482F
C5 3.8 2.4 2.5 3.4 250C / 482F
C7 3.4 3.23 4.0 2.75
250C / 482F
C8 3.85 2.95 3.05 3.5 250C / 482F
C8B 4.2 2.913 2.96 4.12 250C / 482F
C9 3.8 3.516 4.01 3.32 250C / 482F
C10 4.0 3.617 3.51 3.82 250C / 482F
C11 4.3 2.512 2.56 4.32 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