Pot magnets with threaded stem

Similar to other types of pot magnets, these are covered with a steel "pot/cap" which increases the holding power when in direct contact with an iron surface. In addition, pot magnets in this category have a threaded bolt that allows the pot magnet to be secured using a nut. The magnets are popular for hanging things such as lamps, signs and ceiling tiles.
Pot magnets have a very strong magnetic attraction due to their steel pot/cap. But be aware that the strength is calculated for a direct pull. If the pot magnet is placed on a vertical surface (e.g. a whiteboard), the pot magnet will hold 10-15% of its rated strength before slipping or falling off. You should therefore consider whether the pot magnet needs to hold something vertically or horizontally and choose the magnetic strength accordingly. To prevent the pot magnet from slipping, you can increase the friction by using a rubber cap or silicone washer. A link to these can be found below.

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