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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 is a very small rectangular ferrite block magnet, measuring 2.45 mm in length and 1 mm in both width and height. It is magnetised along its length and is barely noticeable when held in the hand....
7.4x6x5mm Ferrite Small Block Magnet Introduction，Material: Hard Ferrite (Ceramic)，Shape: Block / Rectangle / Bar，Coating: No Coating，Grade (Chinese Stardard): Y30，Operating temperature: -40°C to 250°C，Delivery time: 7-15 days，Magnetization direction: thickness....
U-shaped neodymium magnets are a type of high-performance permanent magnet material with a structure resembling the letter ‘U’. Manufactured from sintered neodymium-iron-boron, they are characterised by high magnetic energy product....
This is a radial 4-pole ring (Hollow cylinder) magnet, the material is bonded NdFeB, with high magnetic performance, the size is 16mm outer diameter, inner hole 5mm, height 20mm, surface gray epoxy treatment, suitable for water pump motor...
This product is a 4-pole ring magnet, injection-molded ferrite material, the sample size is 22mm outer diameter, 7mm inner diameter, 4mm thickness, 2 N poles and 2 S poles, mainly used for push rod motors, magnetic induction devices, encoders, etc.,...
This is a radial 2 pole circular magnet designed specifically for magnetic encoder chips. It is made of sintered neodymium-iron-boron with N35 grade performance and is suitable for standard environments....
This product is a multi pole magnetic ring with an inner diameter of 1.5mm. The material is injection molded ferrite. It adopts axial multi pole magnetization and is mainly used for DC motors. If you have a sample of similar injection molded magnetic products, please contact us for quotation....
This is a very small size rectangular block magnet with galvanized surface, 3mm length, 1.5mm width and height, with very fine tolerance, magnetized by lengthwise direction, mainly used in precision electronics, instrumentation, please contact us if you need to buy....