Abstract: A dual function lock/latch device selectively operable in a latch configuration or lock configuration comprising an outer housing having a bore formed therethrough including a lock spline and sleeve actuator spline, an inner member having a keyway and cam lock/latch member formed on the outer and inner end portions thereof rotatable between a lock/latch position and an unlock/unlatch position disposed within the bore with a set of sleeve actuator tumblers and a set of locking tumblers disposed longitudinally along the periphery thereof movable from an extended and a retracted position by a key inserted into the keyway, and an intermediate sleeve disposed between the inner member and outer housing including a sleeve actuator slot and a lock slot formed therethrough such that when in the lock configuration and lock/latch position the lock tumblers extend through the lock slot into the lock spline to lock the inner member relative to the outer housing to lock the dual function lock/latch device in the lock/latch