Neodymium pot magnets with countersunk borehole
The countersunk pot magnet has a strong neodymium magnetic core and is very robust. It is mounted using a countersunk head screw. Neodymium pot magnets with a countersunk bore are always suitable when a strong holding force is needed in the smallest possible space.
If you want to mount the magnet with a cylinder head screw, we recommend using the same type of pot magnet with a cylindrical bore.
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Neodymium pot magnets with countersunk hole
These strong permanent magnets consist of a neodymium ring magnet with countersunk borehole and conical recess, which is built into a steel cup. This protective steel casing has two advantages: It shields the magnet and directs the field lines to the open holding surface. This increases the holding force, which is why these magnet systems are considerably stronger than raw magnets of the same size.
Since the field lines are concentrated by the steel pot, the magnetic field of countersunk pot magnets with a borehole is very strong but also quite flat. This means that the magnet must be in direct and full contact with the surface. Only then can it develop its full holding power. Even a small air gap of 1 mm between the pot magnet and the holding surface will reduce the holding power. An air gap can also occur due to paint, rust or uneven surfaces.
By the way: You can also find more information about the air gap and how it can affect the adhesive force of a pot magnet in our magnet encyclopedia!
Our countersunk pot magnets are resistant to temperatures up to 80°C, axially magnetized and have a neodymium magnetic core. Alternatively, we also have cost-effective ferrite magnets with conical countersunk holes in our range.
Can pot magnets with conical counterbore be used outside?
Although both the magnet and the steel pot are corrosion-resistant due to a nickel coating, this can flake off over time. At such points, the magnet can quickly start to rust. This is not a big problem for the steel cup, but it does affect the built-in neodymium magnet.
Pot magnets with conical counterbore are therefore not suitable for such applications.
For outdoor use or use in humid environments, we recommend our rubberized magnets. They also have a strong neodymium magnet core and a conical counterbore.
Comparison of magnets with countersunk borehole and conical countersink
Our product range includes many variants of magnets with countersunk borehole and conical countersink. We have both neodymium raw magnets and magnet systems with ferrite or temperature-resistant samarium cobalt and AlNiCo in our program.
To help you quickly find the countersunk pot magnet that's right for you, we've put together a brief overview:
- Neodymium raw magnets are suitable for applications that require high adhesive forces with little force application. Neodymium magnets are very brittle and break easily, which is why they are suitable for applications with controlled force application.
Example: as a holding magnet for flaps and drawers in furniture construction. - Neodymium pot magnets with a countersunk conical bore are perfect for applications with high demands on holding power in a small space. The magnet is protected by the steel cup and is much more robust than a raw magnet.
When using these pot magnets, temperatures must not exceed 80°C.
Not suitable for outdoor use! - Ferrite pot magnets with conical countersunk boreholes are resistant to weather and suitable for outdoor use. They can also withstand temperatures of up to 200°C. Although their holding force is weaker than that of neodymium magnets, it is perfectly sufficient for many applications.
- Temperature-resistant pot magnets with a countersunk hole and conical countersink are designed for applications in drying ovens and for deep-frying. They can withstand extreme temperatures - up to 450°C, depending on the design!