Abstract: A cylindrical door lock includes an escutcheon member having a sleeve, a tube rotatably engaged in the sleeve, a knob rotatably secured to the sleeve and having a lock device, a barrel rotatably received in the escutcheon member and having one or more projections for engaging into the tube, an inner knob secured to the barrel, a rod slidably engaged in the inner knob and having two depressions, a spring catch engaged on the barrel and having two legs for selectively engaging with the depressions of the rod and for selectively locking the barrel to the rod.