Can you cut a magnet? In most cases, you should not cut, grind or drill a finished permanent magnet yourself. Neodymium (NdFeB), ferrite and samarium-cobalt magnets are hard and brittle, and machining them can cause cracking, chipping, heat damage, coating failure and hazardous dust.
Magnet manufacturers can machine magnetic materials with specialized equipment and controlled processes, but dimensional finishing is normally done before final magnetization. If you need a different size or shape, the safest and most reliable option is to source the magnet to the required dimensions from the start.
Why Cutting a Finished Magnet Is Risky
1. Permanent Magnet Materials Are Brittle
Neodymium, ferrite and SmCo magnets are not ductile like ordinary steel. They behave more like hard ceramic materials and can crack, chip or shatter when subjected to cutting forces, vibration or impact.
This is one reason conventional saws, drills and grinding tools are poor choices for finished magnets.
2. Cutting Generates Heat That Can Reduce Magnet Performance
Machining creates localized heat. If the magnet becomes too hot, it can suffer irreversible magnetic loss, depending on the material grade, geometry and magnetic circuit.
For example, a standard N35 neodymium magnet is commonly rated for a maximum operating temperature around 80°C / 176°F. That is not its Curie temperature; the Curie temperature is much higher. However, irreversible demagnetization can begin well below the Curie point if the magnet is heated beyond its intended operating range.
See our Neodymium Magnet Grades & Temperature Limits for grade-specific guidance.
3. Cutting Changes the Magnetic Geometry
Cutting a magnet does not simply make one smaller version of the original part. The resulting pieces generally remain magnetic, but their field shape, pole geometry, surface field and pull-force behavior change because the magnet dimensions and aspect ratio have changed.
If your design depends on a specific field pattern, air gap or holding force, machining a finished magnet can make the original performance assumptions invalid.
4. Neodymium Dust and Fine Particles Can Be Hazardous
Grinding or cutting NdFeB can generate fine metallic particles. These particles can be irritating to breathe and, under the wrong conditions, combustible or flammable. Sparks, heat and accumulated dust increase the risk.
For that reason, finished neodymium magnets should not be modified with ordinary shop tools or hobby power tools.
5. Machining Can Damage the Protective Coating
Most neodymium magnets use a protective coating such as Ni-Cu-Ni or epoxy because the underlying NdFeB material is susceptible to corrosion.
Cutting, grinding or drilling through that coating exposes the base magnet material and can create a new corrosion path. If corrosion resistance is important, the part may require controlled machining followed by a new protective coating.
For environmental applications, see our Epoxy-Coated Neodymium Magnets guide.
Can You Drill a Hole in a Neodymium Magnet?
Drilling a finished neodymium magnet is generally not recommended. The magnet can chip or fracture, the tool can generate damaging heat, and the operation removes the protective coating.
If your application needs a hole, countersink or threaded mounting feature, it is better to specify that geometry during manufacturing or use an existing ring magnet, countersunk magnet or magnetic assembly designed for mechanical mounting.
Can You Grind a Magnet Smaller?
Controlled grinding is used in professional magnet manufacturing, especially for dimensional finishing. But grinding a finished, magnetized magnet outside a controlled process is risky because of heat, dust, brittleness and coating damage.
If the required dimension is not available in stock, use the Magnet RFQ Builder to request a custom size instead.
How Are Magnets Machined During Manufacturing?
Permanent magnet materials are typically formed, sintered or cast close to their final geometry and then precision-finished with specialized grinding, slicing or other machining methods appropriate to the material. Final magnetization is generally performed after the critical dimensional work is complete.
Read How Neodymium Magnets Are Made for a broader overview of the production process.
Better Alternatives to Cutting a Magnet
- Buy the correct stock size: Search Radial Magnets inventory by dimensions, grade and SKU.
- Use multiple smaller magnets: An array or assembly may produce the required footprint without machining.
- Use a ring or countersunk magnet: Choose a part already designed with a hole or mounting feature.
- Specify a custom magnet: Define the final dimensions before magnetization using our custom magnet RFQ tool.
- Design the surrounding hardware around the magnet: A housing, cup, carrier or encapsulation can often solve the mechanical-fit problem without altering the magnet.
Frequently Asked Questions
Will a magnet still work if you cut it in half?
If a magnet is successfully divided without excessive heat or damage, each piece will generally still have a north and south pole. However, the field distribution, surface field and force characteristics will differ from the original magnet.
Can you cut a neodymium magnet with a hacksaw?
It is not recommended. Neodymium magnets are brittle, and sawing can cause cracking, heat buildup, coating damage and hazardous particles.
Can you use a Dremel or angle grinder on a magnet?
Using hobby grinding tools on finished NdFeB magnets is not recommended because they generate heat, sparks and fine particles while also damaging the corrosion-protective coating.
Can ferrite magnets be cut?
Ferrite is also hard and brittle. Professional manufacturers can grind or machine ferrite with appropriate equipment, but conventional cutting methods can easily crack the material.
What should I do if I need a custom magnet size?
Start with our Search Inventory tool. If no stock size fits, submit the required dimensions, material, grade, coating and magnetization direction through the Magnet RFQ Builder.
