Abstract: An enclosure arrangement for small electric motors having different heights or thicknesses of the pack of magnetic laminations thereof, which is constituted by two mutually opposite identical half-shells in which opposite ends have different depths, the half-shells being dimensioned so that the ends of the front half-shell for bearing the motor shaft passage hole, can be slidingly inserted in or on the ends of the rear half-shell to varying extents depending on the thickness of the lamination pack, while leaving the same always partially exposed.