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A tubular lock is a variation of a pin tumbler lock, where the pins are arranged in a circle facing the front of the lock and are operated by a tubular key. It was once referred to as an ACE lock, with ACE being a trademark of the Chicago Lock Company, but the generic term tubular lock is far more common these days.
With the help of a qualified door hardware installer an existing tubular lock can be replaced by a more secure mortise lock, if you need some extra security. A mortise lock will require a special mortise preparation at the edge of the door in order to be installed.