The neodymium magnet block with length and width over 40mm and the round neodymium magnets with diameter over 40mm are usually known as big neodymium magnets. Meank manufacture and supply nice big neodymium rare earth magnets,we have wide size range for big strong magnets for sale,the dimension of the biggest neodymium magnet is close to 250mm.
Available surface treatment for big neodymium(NdFeB) magnets
Big neodymium(NdFeB) rare earth magnets material are not rust-resistant, surface protection treatment is necessary for a big neodymium strong magnet. Here is the available surface treatment for big rare earth neodymium strong magnets,and details of each kind of coating.
|Passivation||1||Silver Grey||Temporary Protection|
|Nickel||Ni+Ni||10-20||Bright Silver||Excellent Against Humidity|
|Ni+Cu+Ni||Good Against Salt Spray|
|Zinc||Zn||8-20||Bright Blue||Excellent Against Salt Spray|
|C-Zn||Shinny Color||Superior Against Humidity|
|Tin||Ni+Cu+Sn||15-20||Silver||Superior Against Humidity|
|Silver||Ni+Cu+Ag||10-20||Silver||Superior Against Humidity|
|Copper||Ni+Cu||10-20||Gold||Excellent Against Humidity&Salt Spray|
|Epoxy||Epoxy||15-25||Black,Red,Grey||Excellent Against Humidity,Salt Spray,Superior Against Solvents,Gases, Fungi and Bacteria,FDA Approved|
|Ni+Cu+Epoxy||Excellent Against Humidity|
|Parylene||Parylene||5-20||Grey||Excellent Against Humidity|
|Chemical||Ni||10-20||Silver Grey||Excellent Against Humidity|
Caution is necessary for big neodymium strong magnets
Big neodymium magnets are super powerful and strong magnets,which are very dangerous,they can cause damage to your body and all electronic devices.And are also fragile.So please make sure read the safety neodymium magnets information before using and handle big neodymium magnets.
The grade for big powerful and strong rare earth neodymium magnets
The highest available grade for big powerful and strong rare earth neodymium magnets is N52, the table list all available grade for big neodymium magnets,and maximum working temperature for each grade.
|Neodymium Material Grade||Maximum Working Temp.||Curie Temp.|
|N（N35,N38,N40,N42,N45,N48,N50,N52）||176°F (80°C)||590°F (310°C)|
|N-M（N35M,N38M,N40M,N42M,N45M,N48M,N50M,N52M）||212°F (100°C)||644°F (340°C)|
|N-H（N35H,N38H,N40H,N42H,N45H,N48H,N50H）||248°F (120°C)||644°F (340°C)|
|N-SH（N35SH,N38SH,N40H,N42SH,N45SH,N48SH）||302°F (150°C)||644°F (340°C)|
|N-UH（N28UH,N30UH,N33UH,N35UH,N38UH,N40UH,N42UH）||356°F (180°C)||662°F (350°C)|
|N-EH（N28EH,N30EH,N33EH,N35EH,N38EH,N40EH）||392°F (200°C)||662°F (350°C)|
|N-AH（N28AH,N33AH,N35AH,N38AH）||428°F (230°C)||662°F (350°C)|
What is the biggest neodymium magnets can I buy?
The biggest neodymium magnets are with 250mm length,we have ever supplied big neodymium magnet block with dimension of 8"x4"x2".
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