The invention is directed to an insulator (1) for a gas insulated device. The insulator comprises an injection molded insulator disc (2) and a conductor (3). The insulator disc (2) is made by injection molding of a first material. The insulator disc (2) comprises a center opening (4) encompassed by an inner bead (5) inside which the conductor (3) is arranged. A gap (18) arranged between the inner bead (5) and the conductor (3) is at least partially filled with a second material to form a transition means (19) between the insulator disc (2) and the conductor (3).