PML-C Lifting magnets have a circular multi-pole clamping surface and are therefore ideally suited to lift workpieces having an annular contact surface and bearing housings, flange plates and rings. Since annular workpieces often the contact surface is reduced to the magnet, the max. Be roughly calculated carrying capacity as follows: Contact surface in cm² x 4 = max. Load in kg. These notional value are still the reduction factors for alloy, hardness and temperature to be counted. Whether the required safety factor of 3 in series workpieces is achieved, must be checked. In the non-magnetic center of the rake face is a M10 thread, onto which a centering disc or pin can be screwed.