Magnetic Pads (commonly known as ‘MagPads’) are used for securing objects to magnetic surfaces. The pad comes with an thread stud with locking nut which is ready to fix. They are the preferred choice for applications involving fixing roof signs to vehicles and signs to steel surfaces. These magnets are designed to give a extremely high resistance to shear forces, whilst also exerting high magnetic performance.

A through hole magnetic mounting pad has one large rectangular bar magnet on its base.
This magnet has only one magnetic face, magnetised in the form of a multi-pole magnet.
This is where the magnetic face is magnetised in a striped pattern of alternating north and south poles e.g. north, south, north, south.

The through hole magnetic mounting pad requires multi-pole magnetisation due to the steel back plate preventing the magnetic field from escaping through the top of the magnetic mounting pad. Only one half the magnetic mounting pad needs to be magnetised so that it can attach to a ferromagnetic material. The other side is used to hold the sign with the help of the through holes.

Rubber coating
The magnet on a through hole magnetic mounting pad has a rubber coating to prevent it from scratching the non-ferromagnetic material it is attached to.
It also increases the amount of surface friction. The increased surface friction helps the magnet to grip the surface of the non-ferromagnetic material. This means it can hold larger objects than a standard magnet, such as a bar magnet.
The rubber used on the magnetic mounting pad is made of polyurethane, which is a type of polymer plastic. The rubber coating can become indented and torn.
When the magnet’s rubber coating becomes torn after a few years due to general wear and tear from outdoor exposure e.g. freezing conditions, the rubber will become very brittle. You can remove it with a pair of scissors and re-coat the magnet with some new rubber.