Pot magnets with internal thread

This type of pot magnet has an internal thread so that it can be mounted with a bolt. You can find a bolt size that matches the the thread of the pot magnet, by comparing the thread size found on the product pages with this little chart: Chart to find the correct bolt size
Pot magnets have a very strong magnetic pull force 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 the stated strength before it slides down or tips off. Therefore, you should check whether the pot magnet needs to hold something vertically or horizontally and choose the magnetic strength accordingly. To prevent the pot magnet from sliding down, you can increase the friction by using a rubber cap or silicone washer. You will find a link to them below.