tubular lock

Lock whose knobs activate a latch bolt and is locked by pushing a button; it is used for interior doors.

outside knob

Knob located on the outer side of the door.

spindle

Extended part that manipulates the bolt when turned.

faceplate

Thin plate fastened to the edge of the door with an opening through which the bolt passes.

latch bolt

Part whose beveled end is activated by a doorknob; it catches automatically in a strike plate when the door is closed.

push-button

Button that activates the locking mechanism when pushed.

inside knob

Knob located on the interior side of the door; it contains a push-button.

rose

Decorative plaque with an opening in the center allowing the doorknob to turn.

bolt

Metal threaded peg ending in a head; it screws into a nut.

nut

Hollow cylinder of metal whose lining is threaded to screw onto a corresponding bolt.