Magnetic Hold on a Vertical Surface

There are numerous factors to consider when selecting the appropriate magnet for your needs, and one important variable is the orientation of the metal surface you intend to attach the magnet to.

The listed pull force for each magnet on our website is measured by lifting or bonding it to a 10mm thick mild steel plate in a horizontal position. However, when magnets are placed on a vertical surface of the same thickness, magnets will no longer have a direct holding force but a sheer force which is generally only about 30% of the listed pull force. This reduction occurs due to the effects of gravity and the limited traction between the magnet’s smooth or shiny surface and the steel, more abrasive surfaces will result in a slightly higher holding force however this will be no where near the direct holding force of the magnet.

For example, if a magnet has been tested to a pull force of 1kg under horizontal conditions (using 10mm thick mild steel), that force is reduced to roughly 300 grams when placed on a vertical surface.

Since fridges and metal lockers are often made from 1mm or 2mm thick steel—much thinner than the 10mm steel used for testing—the magnetic field can’t fully saturate the material, reducing the magnet’s holding capacity.

Additionally, any material placed between the magnet and the metal surface, such as a sheet of paper, will further decrease the magnet’s strength slightly.

While we do our best to help customers find the most suitable magnets for their specific applications, it often takes some trial and error to find the perfect match. It’s important to take into account all environmental factors to ensure you select the right magnetic product.