A lock device comprising: - a cylinder housing; - a substantially cylindrical cylinder core having a longitudinal axis and which is rotatably accommodated in the cylinder housing; and - an extension (40, 50) arranged to cooperate with a lock mechanism; - wherein the cylinder core exhibits an inner end surface facing the extension; characterized by - an interlocking means comprising: - a first part, which is movable axially between an outer end position, wherein it extends from the inner end surface of the cylinder core, and an inner end position, wherein it is does not extend from the inner end surface of the cylinder core, the first part having a configuration which, during engagement with the extension, causes movement of the first part from its outer to its inner end position; - a second part, which is movable axially between an outer end position, wherein it extends from the inner end surface of the cylinder core, and an inner end position, wherein it is does not extend from the inner end surface of the cylinder core; - a blocking means (65, 65a), which is movable between a blocking position, wherein the movement of the second part from the outer end position is blocked, and a non-blocking position, wherein the movement of the second part from the outer end position is permitted, and - a resilient means arranged between the first and second parts of the interlocking means so that the second part follows the movement of the first part when the blocking means is in the non-blocking position. - a cylinder housing; - a substantially cylindrical cylinder core having a longitudinal axis and which is rotatably accommodated in the cylinder housing; and - an extension (40, 50) arranged to cooperate with a lock mechanism; - wherein the cylinder core exhibits an inner end surface facing the extension; - an interlocking means comprising: - a first part, which is movable axially between an outer end position, wherein it extends from the inner end surface of the cylinder core, and an inner end position, wherein it is does not extend from the inner end surface of the cylinder core, the first part having a configuration which, during engagement with the extension, causes movement of the first part from its outer to its inner end position; - a second part, which is movable axially between an outer end position, wherein it extends from the inner end surface of the cylinder core, and an inner end position, wherein it is does not extend from the inner end surface of the cylinder core; - a blocking means (65, 65a), which is movable between a blocking position, wherein the movement of the second part from the outer end position is blocked, and a non-blocking position, wherein the movement of the second part from the outer end position is permitted, and - a resilient means arranged between the first and second parts of the interlocking means so that the second part follows the movement of the first part when the blocking means is in the non-blocking position. - a first part, which is movable axially between an outer end position, wherein it extends from the inner end surface of the cylinder core, and an inner end position, wherein it is does not extend from the inner end surface of the cylinder core, the first part having a configuration which, during engagement with the extension, causes movement of the first part from its outer to its inner end position; - a second part, which is movable axially between an outer end position, wherein it extends from the inner end surface of the cylinder core, and an inner end position, wherein it is does not extend from the inner end surface of the cylinder core; - a blocking means (65, 65a), which is movable between a blocking position, wherein the movement of the second part from the outer end position is blocked, and a non-blocking position, wherein the movement of the second part from the outer end position is permitted, and - a resilient means arranged between the first and second parts of the interlocking means so that the second part follows the movement of the first part when the blocking means is in the non-blocking position.