China Neodymium And Ferrite Magnets Manufacturer & Supplier 
Neodymium countersunk block magnets refer to a structural form made from neodymium material in a block shape (square or rectangular) with countersunk holes (also known as countersunk holes or conical holes) machined on the surface. These countersunk holes are typically used in conjunction with screws for fastening, allowing the screw head to be flush with or slightly below the magnet surface. This ensures secure installation while preventing the screw from protruding and affecting performance.
Common type of neodymium block magnet with two countersunk holes.
The ingenious application of neodymium countersunk magnets lies in their countersunk design, which features a larger upper section and a smaller lower section, typically at a 90° angle. Combined with their regular shape, these magnets are highly suitable for bonding to flat surfaces such as doors and cabinets. Commonly used grades include N35, N38, N42, N45, and N52, as well as high-temperature grades such as N38SH and N42H.
The number of holes in neodymium block magnets is not limited to two. This depends on the customer's application and the size of the magnet. Typically, there are one, two, or three holes. As for the location of the holes, more than 98% are on the front (large side) of the block neodymium magnet, while a few customers request holes on the side.
After discussing its physical shape, let's talk about its characteristics (advantages). First, the neodymium material gives it super strong magnetism. The larger the size and the thicker the thickness, the stronger the magnetism. In addition, the countersunk hole allows the magnet to be directly fixed with screws on the surface of materials such as wood, plastic, and metal, so it can be installed wherever magnetism is needed.
Common neodymium sink hole block magnet sizes include 10x10x3mm, 15x10x3mm, 20x10x5mm, 30x10x5mm，30x20x5mm, 30x10x10mm, 60x20x5mm, 100x10x5mm, etc.
In terms of application, neodymium countersunk block magnets are mostly used for magnetic adsorption and fixation, such as cabinet doors, machine cabinet doors, and other situations that require concealed strong closing and holding. The countersunk hole allows the magnet to be embedded in the frame for a neat appearance. It strongly and quickly adsorbs and fixes metal workpieces during processing, welding, and assembly.
When selecting neodymium countersunk block magnets, the main considerations are the weight of the object to be attached and the installation environment. Select the appropriate size and grade based on these factors. For high-temperature environments, choose a high-temperature grade such as N35M or N42H. For outdoor or humid environments, we recommend selecting an epoxy coating or ensuring that the surface is properly waterproofed.
The above is an introduction to neodymium sink hole block magnets. They are generally magnetized in thickness. If you need a quote or customization, please send us an email or chat with us online.
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