Abstract: A security lock which has a housing (20) with a faceplate (22) and cover (24) forming an enclosure. A key release cylinder (30) is mounted within the cover (24) allowing manual actuation from the exterior. An electromagnetic solenoid (32) is mounted inside the housing (20) providing actuation of the lock from an external electrical circuit not part of the device. A spring loaded latchbolt (34) penetrates through the faceplate (22) and is equipped with a roller (36) for alignment. The latchbolt (34) provides the dead bolt for the lock. A door latch assembly (56) having a follower (70) inside a barrel (60) restrained by a plurality of balls (74) provides the latch. Both the latchbolt (34) and door latch (56) are retracted simultaneously by either the rotation of a key within the cylinder (30) or electrical power to the solenoid (32). A connecting linkage within attaches the elements together and a pushbutton switch (92) provides indication of the lock' s position through internal electrical contacts.