Abstract: In a door lock assembly, a lock cylinder is releasably fastened within a lock cylinder housing by means of a catch affixed to the lock cylinder and operatively associated with a structure, such as a lock bolt assembly, within the lock cylinder housing. The catch is released by means of an actuating pin passing from the side edge of the door into the lock cylinder housing for disengaging the catch and allowing the lock cylinder to be removed from its housing. The pin, in a preferred embodiment, is carried within the lock bolt.

Abstract: In a door bolt lock a tubular housing extends through a bore in the door near the edge thereof for housing at least one lock cylinder assembly coupled in mechanical operative association with a lock bolt assembly passing from the edge of the door into the tubular housing via an intersecting bore in the door. The tubular housing includes first and second axially separable coaxially aligned portions having flanges on their outer ends for capturing the door therebetween. The first and second tubular housing portions are threadably coupled together either directly or via a threaded insert, whereby the length of the housing is adjustable for accommodating doors of various thicknesses and whereby the two halves of the lock cylinder housing are coupled together by means of a relatively strong threaded tubular structure to make it more difficult to break apart the two halves of the housing.