What is a hidden magnetic disk?
| A hidden magnetic disk is a magnetic disk with a hidden hole in the center of one of its magnetic faces, the north or south pole. | ||
| The countersunk hole has a flat top on one magnetic surface that tapers towards the other in a cone shape. This allows the magnet to be attached to a surface with a countersunk screw. The surface remains flat as the countersunk hole allows the screw to sit flush with the magnet. | |
 | Flush means that the top of the screw and magnet are perfectly level and even on the surface, rather than protruding above it as other types of screws would, such as in a ring magnetic disk. | |
 | Screws used with a countersunk magnetic disc must be the same diameter as the countersunk hole. For example, you will need a 4.8 mm (0.19″) screw to fit into a 4.8 mm (0.19″) countersunk head hole in a countersunk magnetic disk. | |
 | Countersunk head magnetic discs with a screw are ideal for closing the doors of wooden kitchen cabinets. | |
Dimensions of hidden magnetic disks | ||
 | Countersunk magnetic discs are always measured as their diameter x depth x countersunk hole diameter. | |
 | The diameter refers to the distance between the two widest points of the countersunk magnetic disk. The diameter varies from 10 mm (0.39 in.) to 50 mm (1.97 in.). | |
 | The depth of the main magnetic disk is the distance between the two magnetic surfaces and can vary from 2 mm (0.079 inch) to 30 mm (1.18 inch). | |
 | The countersunk hole diameter ranges from 3 mm (0.12 in.) to 6.2 mm (0.24 in.) and measures the diameter of the narrowest part of the countersunk hole. | |
 | The magnetic pull ranges from 0.9 kg (1.98 lbs) to 81 kg (178.57 lbs). | |
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