A countersunk magnetic disc is a magnetic disc with a countersunk hole in the centre of one of its magnetic faces, either the north or south pole.

countersunk magnetic ring

countersunk magnetic ring

countersunk screw in magnet
A countersunk hole has a flat top on one magnetic face which tapers towards the other, in the shape of a cone.
This allows the magnet to be attached to a surface with a countersunk screw. The surface is kept flat as the countersunk hole allows the screw to sit flush with the magnet.

countersunk magnetic disc

countersunk magnetic disc

Flush screw in a countersunk magnetic disc
Flush means that the top of the screw and the magnet are perfectly level and even with the surface, rather than protruding above it like other types of screws would do, in a ring magnetic disc, for example.

Flush screw in a countersunk magnetic disc

Flush screw in a countersunk magnetic disc

4.8mm countersunk screw and a 4.8mm diameter countersunk magnetic disc hole
The screws used with a countersunk magnetic disc need to be the same diameter as the countersunk hole.

For example, you will need a screw that is 4.8mm (0.19″) in diameter to fit inside a 4.8mm (0.19″) diameter countersunk hole in a countersunk magnetic disc.
Drilling into a kitchen cupboard
Countersunk magnetic discs, with the aide of a screw, are ideal for holding wooden kitchen cabinet doors closed.

Sizes of countersunk magnetic discs

Depth, diameter, and countersunk hole diameter of a countersunk magnetic disc

Sizes of countersunk magnetic discs

Sizes of countersunk magnetic discs

Countersunk magnetic discs are always measured as their diameter x depth x countersunk hole diameter.
Countersunk magnetic disc diameter 50mm and 10mm
The diameter refers to the distance between the two widest points of the countersunk magnetic disc. The diameter ranges from 10mm (0.39″) to 50mm (1.97″).

Height of a countersunk magnetic disc 30mm and 2mm
The depth of a basic magnetic disc is the distance between the two magnetic faces and can range from 2mm (0.079″) to 30mm (1.18″).

Diameter pf two countersunk holes in countersunk magnetic discs, 3mm and 6.2mm
The diameter of the countersunk hole ranges from 3mm (0.12″) to 6.2mm (0.24″) and measures the diameter of the narrowest section of the countersunk hole.

Magnetic pull of a countersunk magnetic disc 0.9kg and 81kg
The magnetic pull ranges from 0.9kg (1.98lb) to 81kg (178.57lb).
The magnetic pull is the maximum weight of ferromagnetic material the magnetic disc can hold

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