Tubular Door Locks:
In a tubular lock, the mechanism for retracting the lock bolt is part of the latch assembly. The outside lock chassis has either a square or half-round extension which passes through this mechanism for actuation.
In a tubular lock, the inside and outside spindles are joined by the extension through the latch and move in tandem after assembly.
Tubular Lock Major Components:
Typical Tubular Latch for square spindle
Cylindrical Door Locks:
In a typical residential home, these are the different types of door locks:
For exterior doors, there are keyed door locks. These locks have a cylinder on the outside that, when locked, requires a key to be inserted to release the latch.
The inside portion of a keyed entrance knob or lever will vary according to the manufacturer. For example, one manufacturer may offer a push button lock on the inside