Screw-on neodymium magnets

Which screws are suitable for screw-on magnets?

To mount screw-fastened magnets, use matching countersunk screws that disappear completely into the countersunk hole. If the screw head protrudes after tightening, a gap is created between the magnet and the counterpart. This reduces the adhesive force of the magnet.

We generally recommend using a screw one size smaller. For example: if the countersunk hole in the magnet fits an M4 screw, use an M3 screw instead. Due to its smaller size, the screw exerts less pressure on the magnet, making it less likely that these susceptible magnets will break.

Types of screw-on magnets available at supermagnete

You can purchase the following types from the supermagnete online shop:

• Round magnets with one countersunk hole: These take up very little space and are ideal for compact mounting solutions.
• Round, rubberised magnets with one countersunk hole: The rubber coating protects delicate surfaces from scratches. These magnets are also less likely to slip when subjected to lateral forces.
• Rectangular and square magnets with one countersunk hole: These magnets are suitable, for example, for recessing into precision-fit cut-outs or for applications where an adjacent edge acts as a stop and prevents the magnet from rotating.
• Rectangular magnets with two countersunk holes: These magnets do not rotate as they are secured with two screws.

Tips for installing screw-on magnets

• Tighten the screws carefully: Magnets are brittle and will shatter if subjected to excessive force. Therefore, do not overtighten the screws. We recommend using a screwdriver for fastening.
• Pay attention to magnet polarity: If you want two screw-on magnets to attract each other, the facing sides must have opposite magnetic poles. The product descriptions will indicate whether magnets of the same design are available with different polarities.

Suitable counterparts for screw-on magnets

At supermagnete, you can also buy matching counterparts for screw-on magnets. Ideal counterparts include screw-on metal discs and self-adhesive metal discs. Additional options for use in combination with screw-mounted magnets can be found under the category Surfaces for Magnets.

Possible applications for screw-on magnets

Below are a few examples of how you can use screw-on magnets from the supermagnete online shop for your projects.

Tool holder: With screw-on magnets, you can create an affordable tool rack. Often, these magnets are mounted to a wooden surface. Use the magnets to hang smaller tools such as screwdrivers, spanners or lightweight pliers. Now you always have the most important tools within reach.

Cabinet door latch: Using magnets with a hole and metal discs, you can build a magnetic door latch.

Versatile signage: Magnetic mounting solutions are particularly convenient for shopfitting and exhibition stand construction because they allow for more flexibility. Metal signs or advertising banners can be attached to and removed from the screw-on magnets at any time.

How do screw-on magnets differ from pot magnets?

Screw-on magnets and pot magnets with a hole can both be fastened using screws. The main difference lies in the construction of the two types of magnet. Screw-on magnets differ from pot magnets in the following respects:

Lower-profile design without a steel pot: Unlike pot magnets, screw-on magnets are not protected by a steel pot. They are rectangular, square or round magnets with a countersunk hole. They have a lower profile and can be used more discreetly than pot magnets.

Magnetisation on both sides: As with block magnets or disc magnets, the magnetic force of screw-on magnets acts on both the front and the back. In contrast, the adhesive force of pot magnets is concentrated onto a single contact surface.

Alternatives to screw-on neodymium magnets

The following magnets are suitable alternatives for screw-on mounting:

• Screw-on neodymium channel magnets: These are block magnets that are embedded in a U-shaped steel profile. The operating principle is the same as with pot magnets.
• Neodymium pot magnets with countersunk hole: Pot magnets that are fastened with countersunk screws.
• Neodymium pot magnets with counterbore: Pot magnets that can be mounted using cylinder screws.
• Ferrite pot magnets with countersunk hole: These versions are less expensive than neodymium pot magnets and are suitable for outdoor use.⁣