The electro-permanent magnetic chucks represent the technological development of electromagnetic systems and manual permanent magnet chucks. The main advantage is that they require current only to change the state of the system, a few seconds to switch from OFF (DEMAG) to ON (MAG) and vice versa, overcoming the limit associated with the continuous current absorption of the electromagnets and that of the reduced forces of the manual chucks. The seal of the piece is therefore due to the magnetic field produced by the permanent magnets and not by the current as in the electromagnets, therefore there is no danger of detachment of the piece in the event of any failure of the power supply circuit or absence of power supply.

Fast anchoring of the pieces.
Safety during every work operation.
Free work surface.
Flexibility of use.



Chucks with 70x70 poles and 66 mm thickness


Chucks with 50x50 poles


Round Chucks with height 66 mm



What is a permanent magnetic chuck?

A permanent magnetic chuck uses the flow of permanent magnets to fix parts on which to execute mechanical workings. A mechanical system inside it generates the movement of the magnetic poles and directs the flow externally (ON) or internally (OFF). The switching process generally takes place by means of a lever which, connected to an eccentric shaft, allows the magnet assembly to move.

What is an electro-permanent magnetic chuck?

The permanent-electro system combines the advantages of permanent magnets and those of electromagnets.
An electromagnetic force applied for a minimum time is necessary to energize / orient the internal permanent magnets. Once magnetized, the product remains active with a permanent magnetic force. Similarly, an opposite electromagnetic force is required to deactivate the product. Unlike electromagnets, the product is FAILSAFE and does not heat up over time. Unlike permanent magnetic products there are no moving parts and the forces can be much higher.

How much force can an electro-permanent magnetic chuck generate?

The amount of magnetic flux induced in the workpiece is the factor that determines the clamping force. For optimal locking, the greatest possible magnetic flux must be induced in the workpiece. It means positioning the piece correctly on the north and south poles of the magnetic plane. The anchoring force is proportional to:

  • the square of the magnetic flux density present in the face in contact with the piece.
  • the area of ​​the piece in contact with the magnetic plane, up to the maximum point of its saturation
Density reductions in magnetic flux can occur when the flux encounters magnetic resistance (reluctance). Simple examples can be the air gaps, for air gap we mean the average contact distance between the work piece and the magnetic plane. The main factors that can affect the flow density and the anchoring force of a piece of any size are the following:
  • Contact surface, surface finish, chemical composition, thickness, temperature.
The choice of the correct magnetic equipment must take into account all the factors described.

Will my processing/working system be magnetized?

Usually a cutting tool is made of a magnetically hard material, which means that it is susceptible to magnetism. If the instrument is working inside the magnetic field, it will probably magnetize (even if slightly). Generally, a partially magnetized cutting tool has no performance problems.