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CJ Magnet can provide you with Neodymium, Ferrite, Samarium Cobalt, Alnico rare earth permanent magnets and magnet assemblies.We can also provide you with customized services.

Strong Neodymium Disc/Cylinder Magnets With Countersunk Holes are best for securely attaching magnets to both magnetic and non-magnetic surfaces.

Neodymium disc and cylinder magnets with countersunk holes are small, cylindrical magnets that have a depression on one or both faces, creating a conical-shaped recess. The magnets are typically made from a rare earth metal called neodymium and are known for their strong magnetic properties, making them popular for a variety of applications where a strong magnetic force is required.

Neodymium disc and cylinder magnets with countersunk holes come in a range of sizes and strengths, and their strength is usually indicated by their grade. Higher grade magnets have a stronger magnetic field and are capable of lifting heavier weights.

The countersunk holes on the magnets allow them to be easily fastened to a surface using screws, making them useful for creating magnetic closures, clasps, and fasteners. They can also be used in a variety of industrial and engineering applications, such as in motors, generators, and sensors.

Neodymium Magnets Features & Characteristics
Grades & Materials - Neodymium magnet materials in both standard and premium grades for reduced production and lead times. We offer sintered neodymium magnets in grades ranging from N30 to N55.
Sizes & Shapes - Sizes for standard Neodymium Iron Boron rare-earth magnets range from a few millimeters to approximately 150 mm, while assemblies can weigh up to several tons. Standard shapes include discs, blocks, rings, and arc segments in various sizes and grades. Non-standard shapes and sizes can be custom fabricated exact specifications from raw stock.
Temperature Considerations - Neodymium magnets are temperature sensitive. For applications in which the magnet may be exposed to temperatures in excess of about 250°F (120°C), careful consideration must be given to the choice of magnet grade and the magnetic circuit.
Manufacturing Methods - Due to the relatively brittle nature and high-magnetic strength of NdFeB magnets, cutting and grinding should be done prior to magnetization. We are fully equipped to machine these materials to virtually any shape and size for your project’s specialty requirements using our in-house grinding and EDM facilities. Finishing to tolerances of +/-0.05mm can be achieved, as required.
Surface Treatments - Neo magnets are susceptible to oxidation, so painting, epoxy coating, or plating is highly recommended to prevent corrosion. The common surface treatments include nickel plating, zinc, or epoxy coatings.
Handling & Storage - Neodymium materials are relatively brittle, but are magnetically very strong. They must therefore be handled carefully to avoid injury to personnel and damage to the magnets.

Neodymium magnets have replaced alnico and ferrite magnets in many of the myriad applications in modern technology where strong permanent magnets are required, because their greater strength allows the use of smaller, lighter magnets for a given application. Some examples are:

• Head actuators for computer hard disks
• Mechanical e-cigarette firing switches
• Locks for doors
• Loudspeakers and headphones
• Mobile phone speakers, taptic feedback and auto focus actuators
• Magnetic bearings and couplings
• Benchtop NMR spectrometers
• Electric motors
• Electric generators for wind turbines (only those with permanent magnet excitation)
• Voice coil
• Retail media case decouplers
• In process industries, powerful neodymium magnets are used to catch foreign bodies and protect product and processes
• Identifying precious metals in various objects (cutlery, coins, jewelry etc.)