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What is a countersunk pot magnet?

Countersunk shallow pot magnet A countersunk pot magnet is a pot magnet with a countersunk hole on its magnetic face.
countersunk screw in magnet The countersunk hole tapers inwards at an angle of 82 degrees, allowing the magnet to be attached to a surface with a countersunk screw, providing the screw has an 82 degree angled head. Once attached, the screw should sit flush with the surface of the magnet.
Flush screw in a countersunk shallow pot magnet Here, flush means that when the magnet has been sunk into an object, (e.g. a fridge door), the top of the screw and the magnet will be level with the surface, rather than protruding above like other types of screws would (e.g. on an internal threaded pot magnet).

For more information see the page: How to use a countersunk pot magnet?

M3 and M14 countersunk holes in countersunk pot magnets The countersunk pot magnet has a countersunk hole which can be M3 to M14.

M3 to M14 stands for a metric countersunk hole which is 3mm (0.12″) to 14mm (0.55″) in diameter.

4mm countersunk hole in a countersunk pot magnet with a countersunk wood screw The screws used with a countersunk pot magnet need to be the same diameter as the countersunk hole. For example, you will need a screw that is 4mm (0.16″) in diameter to fit inside a 4mm (0.16″) diameter countersunk hole in a countersunk pot magnet.
Countersunk pot magnet attached to an exhibition display sign Countersunk pot magnets can be used to hold any ferromagnetic material onto a non-ferromagnetic surface; for example, to attach an exhibition display sign to a stand for marketing purposes.