Big Neodymium Magnets

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.

Introducing a super-sized circular neodymium magnet with zinc coating for immense magnetic strength. Ideal for large-scale shipbuilding and machinery industries. Handle with utmost care. Custom hole options available upon inquiry.

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.

SurfaceCoatingThickness (Microns)ColorResistance
1Silver GreyTemporary Protection
NickelNi+Ni10-20Bright SilverExcellent Against Humidity
Ni+Cu+NiGood Against Salt Spray
ZincZn8-20Bright BlueExcellent Against Salt Spray
C-ZnShinny ColorSuperior Against Humidity
TinNi+Cu+Sn15-20SilverSuperior Against Humidity
SilverNi+Cu+Ag10-20SilverSuperior Against Humidity
GoldNi+Cu+Au10-20GoldTemporary Protection
CopperNi+Cu10-20GoldExcellent Against Humidity&Salt Spray
EpoxyEpoxy15-25Black,Red,GreyExcellent Against Humidity,Salt Spray,Superior Against Solvents,Gases, Fungi and Bacteria,FDA Approved
Ni+Cu+EpoxyExcellent Against Humidity
ParyleneParylene5-20GreyExcellent Against Humidity
ChemicalNi10-20Silver GreyExcellent 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 GradeMaximum 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".

Related Products


Please fill the form to let us know your need. Our sales will get in touch with you ASAP.

Industry & Meank News