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Ø 16.8 x 4.4 mm Black Rubber Coated Neodymium Disc Magnet

/Ø 16.8 x 4.4 mm Black Rubber Coated Neodymium Disc Magnet
  • Ø 16.8 x 4.4 mm Black Rubber Coated Neodymium Disc Magnet

Ø 16.8 x 4.4 mm Black Rubber Coated Neodymium Disc Magnet, Rubberised Disc Neo Magnet, Rubber Covered Round Office Neodymium Magnets, Strong Office Whiteboard or Refrigerator Waterproof Magnet

Ø 16.8 x 4.4 mm Black Rubber Coated Neodymium Disc Magnet Parameter:

Part No.: ONMD16.8-BR Series
Size: 16.8mm diameter x 4.4mm thick
Material: Neodymium (NdFeB)
Magnet Shape: Disc / Round
Grade: N38, N40, N42, N45, N48, N50
Color: Black
Plating/Coating: Rubber
Max Operating Temp: 176ºF (80ºC)
Tolerances: ±0.01 x ±0.01 mm
Magnetization: Magnetized Axial Through Thickness (Poles on Flat Ends)
**Magnet size is prior to rubber coating

These neodymium magnets feature a rubber coating, which provides the following advantages:
Rust resistance even in wet surroundings
Protection of delicate surfaces, such as whiteboards and magnetic glass boards
Substantially higher magnetic adhesive force in shear direction than neodymium magnets of similar size

Sintered neodymium magnet is the most widely used type of permanent magnet. It’s made from an alloy of neodymium, iron, and boron to form the Nd2Fe14B tetragonal crystalline structure. Meanwhile, it is a type of rare earth magnets according to its raw material composition.

Material Sintered Neodymium Iron Boron, Rubber, Steel
Dimensions Round / Rectangular Customized
Pull Force 8 lbs — 50 lbs
Magnetization Orientation Axial / Through Thickness
Magnetic Properties Grade Max. Operating Temperatures
N35-N52 80°C  (176°F)
Remanence(Br) 11,300 Gauss —  14,800 Gauss
Coercive Force(Hcb) 10,000 Oersted — 11,600 Oersted
Intrinsic Coercive Force(Hcb) 11,000 Oersted — 12,000 Oersted
Magnetic Energy Product (BH) 33M GOe — 53M GOe
Surface Treatment Ni-Cu-Ni, Nickel, Zn

How Sintered Ndfeb Magnets Are Graded?
Do you know sintered neodymium-iron-boron magnets are rated according to maximum energy product. Look at our Specifications of Neodymium Magnets Page, you will find a rule that grade number 35 in the middle of (BH) maximum value 33-36 MGOe. Therefore, higher values indicate stronger magnets, ranging from N35 up to N55.

And letters following the number indicate maximum operating temperatures (often the centigrade temperature), ranging from M (100℃), H (120℃), SH (150℃), UH (180℃), EH200℃) to AH (220℃). If there is no letters following like N42, then the maximum operating temperature is 80℃.

Ø 22 x 6.4 mm Black Rubber Coating Neodymium Disc Magnet

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Product Range

Imperial
Part No. Magnet Grade Magnet Shaped Surface Dimensions in mm
Width Height
ONMD16.8-BR38 N38 Disc Black Rubber 16.8 4.4
ONMD16.8-BR40 N40
ONMD16.8-BR42 N42
ONMD16.8-BR45 N45
ONMD16.8-BR48 N48
ONMD16.8-BR50 N50
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