FAQ - Frequently Asked Questions (and their answers!)

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How strong are these magnets?

In the description of a few of our magnets, we indicate an approximate holding strength in grams or kilograms. Please note that this refers to a theoretically-attainable, maximum value that only applies under optimal conditions. The actual holding strength is dependent upon the following factors:
  • Distance between the magnet and the object it is attracted to:
    If there is no direct contact, the holding strength reduces very quickly with increasing distance. Even a half millimetre air gap can possibly reduce the holding strength by half. Even a thin coat of paint on a metallic object can cause a reduction in holding strength of the magnet.
  • Material of the object of magnetic attraction:
    The theoretical holding strength is valid when the object of magnetic attraction consists of soft iron. This value reduces by 5% with structural steel ST37; with ST70 by approx. 30%.
  • Surface area of the object of magnetic attraction:
    The smoother the surface, the greater the holding strength. For rougher surfaces, you should anticipate a considerable reduction in holding strength.
  • Direction of the force:
    The theoretical holding strength is valid if a vertical force applies, that is, if the object of magnetic attraction is pulled vertically by the magnet.
  • Thickness of the object of magnetic attraction:
    The object should not be too thin or a magnetic saturation will be achieved and part of the magnetic field will remain useless.
In principle, when planning a specific application of the magnets, you should not rely upon our holding strength specifications, but instead experiment first a bit of your own.
Incidentally: If you require the holding force in Newton, multiply our specifications in kg by 9,81 (a mass of 1 kg creates a downward force of 9,81 Newton).
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