Abstract: A magnetic latchkey for an access-control lock with a series of magnets fastened to sliding pieces capable of being displaced by means of levers or extensions so that each magnet has three possible positions: north pole, south pole, or a point intermediate to both. This allows the magnet to be moved in front of the appropriate sensor of the lock, in such a way that when there is a particular combination of poles in the latchkey and the same combination of switches on the control panel, in touch with the position of the switches at the control panel will be identical to the positions of the levers of the latchkey. An alternative is for each magnet of the latchkey to have two sensors inside the lock.