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Neodymium Magnets 

Neodymium Magnets


- Most powerful
- Strong resistance to demagnetization
- Low working temperature
- High cost
- Easily corrupted
- Hard and brittle
- We also provide Titanium Nitride covered Neodymium magnets upon customers' request. (This magnet has not been tested or certified by any regulatory agency for implantation or use inside the human body. Use of this magnet is strictly at your own risk.)
- Calculation Tools, including Flux Density and Pull Force Determination.

Magnet Materials Neodymium Magnets DiskDisk in stock                 Magnet Materials Neodymium Magnets RectangleRectangle in stock

Neodymium magnets are dark gray alloy. They are composed of neodymium, iron and boron. Density of Neodymium magnets is .27Lb/in3 (7.5g/cm3).
Neodymium magnets are manufactured in a metallurgy process through alloying, crushing, powdering, pressing w/magnetic orientation, sintering, then cutting, coating, inspecting and packing before shipment.

Neodymium magnets offer the highest (BH)max and high Hci
(BH)max, the maximum energy product, of neodymium magnets is highest of any kind of permanent magnets today in the world. (BH)max at different grades of neodymium magnets is 27 to 52 MGOe.

Neodymium magnets have extremely resistance to demagnetization with Hci, Intrisic coercive force, over 12,000 Oe. Because of very high (BH)max and Hci, neodymium magnets could be used as a reversible medium for large amount of energy transformation in miniaturized application where a strong magnetic demagnetization field exists , such as computer hard drive.

Armstrong Magnetics N40 neodymium magnets in disk and rectangle shapes for customers' immediate needs and accept special orders for custom neodymium magnets.

Neodymium magnets are most powerful of any kind of magnetic materials
Br of neodymium magnets are much more than 11,000 Gauss. Therefore, Neodymium magnets have strong holding strength on metal surface and could be used as component for holding, separating, etc. Neodymium magnets must be carefully handled to avoid personal injury and material damage due to its extremely magnetic strength and brittle property.

Neodymium magnets are sensitive to temperature change and even lose magnet properties at high temperature
Neodymium magnets lose -0.09 ~ -0.13% of Br/oC and can work stably under 80oC for low Hci Neodymium magnets and 150oC for high Hci Neodymium magnets.

Neodymium magnets are corrupted in humid environment
Surface protection is strongly recommended, such as plating, varnishing and encapsulating.

Neodymium magnets are hard and brittle
Neodymium magnets can be abrasively machined with coolant served to absorb heating and dust. Without coolant, rare earth magnets could crack and chip by the heat produced during high speed cutting or grinding, and the sparks contain the easily oxidized grinding dust that could cause fire!

Tolerance of Neodymium magnets
Unless otherwise specified, tolerance on dimension of magnetization is +0.005". Other dimensions are +1.5% or +.010", whichever is greater.

Magnetic Property of Neodymium Magnets

Grade Remanence (Br) Coerive Force (Hcb) Intrinsic Coercive Force (Hci) Max Energy Product (BH) max Max Working Temp.
KG T KOe KA/m KOe KA/m MGOe KJ/m oC oF
N35 11.4-11.8 1.18-1.28 >10.8 >836 >12 >955 33-36 263-287 80 176
N38 11.8-12.3 1.18-1.28 >10.8 >860 >12 >955 36-39 287-310 80 176
N40 12.7-12.9 1.27-1.29 >11.0 >876 >12 >955 38-41 303-326 80 176
N42 12.9-13.3 1.29-1.33 >10.5 >836 >12 >955 40-43 318-342 80 176
N45 13.3-13.8 1.33-1.38 >9.5 >756 >12 >955 43-46 342-366 80 176
N48 13.8-14.2 1.38-1.42 >10.5 >835 >12 >955 46-49 366-390 80 176
N50 13.8-14.5 1.38-1.45 >10.5 >835 >11 >955 47-51 374-406 80 176
N52 14.3-14.8 1.43-1.48 >10.8 >860 >11 >876 50-53 398-422 80 176
33M 11.4-11.8 1.14-1.18 >10.3 >820 >14 >1114 31-33 247-263 100 212
35M 11.8-12.3 1.18-1.23 >10.8 >860 >14 >1114 33-36 263-287 100 212
38M 12.3-12.7 1.23-1.27 >11.0 >876 >14 >1114 38-41 303-326 100 212
40M 12.7-12.9 1.27-1.29 >11.4 >907 >14 >1114 38-41 303-326 100 212
42M 12.8-13.2 1.28-1.32 >11.6 >923 >14 >1114 40-43 318-342 100 212
45M 13.2-13.8 1.32-1.38 >11.8 >939 >14 >1114 43-46 342-366 100 212
48M 13.6-14.0 1.36-1.40 >11.8 >939 >14 >1114 46-49 366-390 100 212
50M 14.0-14.5 1.40-1.45 >13.0 >1033 >14 >1114 48-51 382-406 100 212
30H 10.8-11.4 1.08-1.14 >10.2 >812 >17 >1353 28-31 223-247 120 248
33H 11.4-11.8 1.14-1.18 >10.6 >844 >17 >1353 31-33 247-263 120 248
35H 11.8-12.3 1.18-1.28 >11.0 >876 >17 >1353 33-36 263-287 120 248
38H 12.3-12.7 1.23-1.27 >11.2 >890 >17 >1353 36-39 287-310 120 248
40H 12.7-12.9 1.27-1.29 >11.5 >915 >17 >1353 38-41 303-326 120 248
42H 12.8-13.2 1.28-1.32 >12.0 >955 >17 >1353 40-43 318-342 120 248
45H 13.2-13.5 1.32-1.38 >12.0 >955 >17 >1353 42-46 335-366 120 248
46H 13.3-13.8 1.33-1.38 >12.2 >972 >16 >1274 44-47 350-374 120 248
48H 13.6-14.3 1.36-1.43 >12.5 >995 >16 >1274 46-49 366-390 120 248
Grade Remanence (Br) Coerive Force (Hcb) Intrinsic Coercive Force (Hci) Max Energy Product (BH) max Max Working Temp.
KG T KOe KA/m KOe KA/m MGOe KJ/m oC oF
30SH 10.8-11.4 1.081.14 >10.0 >796 >20 >1672 28-31 223-247 150 302
33SH 11.4-11.8 1.14-1.18 >10.5 >836 >20 >1672 31-34 247-276 150 302
35SH 11.8-12.3 1.18-1.23 >11.0 >876 >20 >1672 33-36 263-287 150 302
38SH 12.3-12.7 1.23-1.27 >11.4 >907 >20 >1972 36-39 287-310 150 302
40SH 12.5-12.8 1.25-1.28 >11.8 >939 >20 >1972 38-41 302-326 150 302
42SH 12.8-13.2 1.28-1.32 >11.8 >939 >20 >1672 40-43 320-343 150 302
45SH 13.2-13.8 1.32-1.38 >12.6 >1003 >20 >1592 43-46 342-366 150 302
30UH 10.8-11.4 1.08-1.14 >10.2 >812 >25 >1990 28-31 223-247 180 356
33UH 11.3-11.7 1.13-1.17 >10.7 >852 >25 >1990 31-33 247-263 180 356
35UH 11.7-12.1 1.17-1.21 >10.7 >852 >25 >1990 33-36 263-287 180 356
38UH 12.1-12.5 1.21-1.25 >11.4 >907 >25 >1990 36-39 287-310 180 356
40UH 12.5-12.8 1.25-1.28 >11.4 >907 >25 >1990 38-41 302-326 180 356
28EH 10.5-10.8 1.05-1.08 >9.5 >756 >30 >2388 26-29 207-231 200 392
30EH 10.8-11.4 1.08-1.14 >9.5 >756 >30 >2388 28-31 223-241 200 392
33EH 11.3-11.7 1.13-1.17 >10.2 >812 >30 >2388 31-33 247-263 200 392
35EH 11.7-12.1 1.17-1.21 >10.2 >812 >30 >2388 33-36 263-287 200 392
38EH 12.1-12.5 1.21-1.25 >11.4 >907 >30 >2388 36-39 287-310 200 392
30AH 10.8-11.3 1.08-1.13 >10.2 >812 >35 >2785 28-32 223-255 220 428
33AH 11.2-11.7 1.12-1.17 >10.2 >812 >35 >2785 31-34 247-271 220 428

Note:
1. The data above are tested at 20ºC.
2. The maximum working temperature for a given magnet could be less due to the ratio of length and diameter of the magnet, the structure of its assembly with steel parts and environmental factors.
3. A strong external adverse magnetic field, shock, vibration and elctro-magnetic field can result in partial demagnetization.