Spool 1 for winding wire 2 comprising a hub 3, having a cylindrical external surface 4 extending around a main axis X-X, on which a channel 5 is afforded for guiding the wire 2 through the hub 3 terminating with a first hole 51 and a second hole 52.Three flanges 6,7,8 to define at least two chambers for winding the wire about the hub 3.Wherein the aforesaid hole 51 terminates with a respective terminal portion 9 made inside the cylindrical external surface 4.
