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Among numerous industrial and electronic products, powerful magnets are widely used due to their small size and strong magnetic force. However, when design pursues lighter, thinner, and more compact products, the thickness of magnets becomes a key parameter. Many people wonder: why can't powerful magnets be made too thin?
This is because neodymium magnet is a sintered material, which is hard and brittle like ceramic. Once the thickness becomes too thin (such as 0.3mm, 0.2mm, or even thinner), it is highly prone to chipping and cracking during processes like slicing, grinding, electroplating, and packaging, resulting in a significant drop in yield rate.
The accompanying image shows a thin flat round rare earth magnets.
Additionally, the magnetic flux (magnetic strength) of magnets is closely related to their volume, particularly with thickness having a significant impact on “magnetic force.” Even when using high-performance grades (such as N52), the magnetic flux density of overly thin magnets decreases rapidly, resulting in weakened magnetic force that fails to meet design requirements.
Another important point is that ultra-thin magnets are more prone to demagnetization due to high temperatures or external interference, which is unacceptable for electronic products and sensors that require high stability.
Although neodymium magnets cannot be made infinitely thin, through years of process refinement, 0.5mm has gradually become a relatively mature and mass-producible thickness.
Some customers' product designs require magnet thicknesses of 0.2mm or 0.3mm. What can be done?
For such thin thicknesses, we are also unable to assist, as the blades of magnet processing machines have a certain thickness, and we cannot produce them if they are too thin. A thickness of around 0.5mm is much easier to produce.
If your product has special requirements for magnet thickness, we recommend prioritizing thicknesses of 0.5mm or above and communicating with a professional magnet manufacturer to discuss customization options.
Some examples of our ultra-thin strong magnets:
This product is a 1mm 6-sided magnet, made of rare earth neodymium magnet, N52 grade, the surface coating is gold, very beautiful, the width is 6mmmm, the thickness is 1mm, and the thickness is magnetized. If you are interested in this small-sized polygonal magnet You can contact the courage magnet manufacturer to quote and customize for you....
You need to buy small magnets with holes. Welcome to the Courage Magnet Factory in China. We can customize small magnets with through holes (straight holes) or countersunk holes for you. You can choose NdFeB or other weak materials. The magnetic performance is generally above 3000 Gauss. If you need to know its price, please send us an inquiry, thank you!...
This sample is a magnet with a thickness of 12mm, the material is strong NdFeB magnet, the thickness is magnetized, and the surface is galvanized. You can also choose radial magnetization, depending on your needs, the specific size is 6mm in diameter, 12mm in height and thickness....
This product is a magnetic steel for the electric tricycle/bicycle handle governor, with an arc shaped shape and made of rare earth neodymium...
This sample is a magnet with a diameter of 9mm and a thickness of only 1.5mm. It belongs to the series of thin and strong magnets. It is provided by the NST magnet manufacturer in China....
If you're looking for ultra-thin round magnets in stock, check out this model: 20mm in diameter and 0.5mm thick (20x0.5mm),...
This product is a radially magnetized 10-pole (5N5S) ring magnet, the material is bonded NdFeB, the surface coating is black epoxy, the magnet size is 27mm outer diameter, 22.7mm inner diameter, 21mm height, if you feel this specification If you are interested, you can contact our company for a quotation, provide samples...
This product is a 12 poles axial ferrite ring designed for rowing machines. It features a relatively large central bore and is manufactured from high-performance sintered ferrite material....