A cap (68) for a writing, drawing or painting instrument, comprising a casing (10) for said cap and a clamping ring (42), characterized in that the clamping ring is arranged separately inside the casing of said cap and the inner peripheral surface of the casing of the cap, together with the outer and inner peripheral surfaces of the clamping ring are embodied in such a way that when the cap is placed on the housing (32) of a writing, drawing or painting instrument and a subsequent relative axial rotation occurs between the cap and the housing, an axial interference fit of the cap on the housing ensues.
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