FAQ - Frequently Asked Questions
How strong is this magnet?
- Distance between magnet and object:
If there is no direct contact between the magnet and the object, the adhesive force decreases quickly with increasing distance. Even a small gap of half a millimetre could cut the adhesive force in half. Also, a thin paint cover on the object contributes to a decrease in adhesive force as well.
With our new Adhesive Force Tool you can determine the adhesive force at various distances.
- Material of object of magnetic attraction:
The theoretical adhesive force is valid when the object of magnetic attraction consists of pure soft iron. This value is reduced by about 5% when it comes to structural steel ST37 and approx. 30% with ST70.
- Surface area of the object of magnetic attraction:
The smoother the surface, the greater the adhesive force. For rougher surfaces, you should anticipate a considerable reduction in adhesive force.
- Direction of the force:
The theoretical adhesive force is valid if a vertical force applies, that is, if the object of magnetic attraction is pulled vertically by the magnet. See our FAQ about shear force
- 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 you should not rely on our adhesive force specifications, but rather do an experiment of your own first.
By the way: If you require the adhesive force in Newton, multiply our specifications in kg by 9,81 (a mass of 1 kg creates a downward force of 9,81 Newton).