You walk into a room and notice that the door knob has fallen off. It's a rare departure from everyday reality, but it does happen sometimes. From constant use, mounting bolts can loosen and cause the knob to fall—sometimes at the worst time. If you can find all of the parts on the floor, you'll have the door knob reassembled and working again in just a few minutes.
Why Door Knobs Fall and How to Fix Them
Modern door knobs consist of two door knob assemblies, one on each side of the door. Two mounting bolts connect the assemblies.
When the bolts are removed or fall out, the assemblies separate. One door knob falls down. Sometimes, the door knob on the other side falls out, too.
Fixing a door knob that fell off is just a matter of fitting the two parts back together, then attaching them with the mounting bolts.
How to Open a Door Without a Knob
If the door knob fell off, you might be stuck inside or outside of a room—apparently with no way to open the door. Not to worry. You're not really stuck.
If the outside assembly is still in place, the long, thin spindle will protrude through the door latch. Turning the spindle is the same as turning the door knob. Since grip is a problem, use pliers to turn the spindle. If you don't have pliers, use a clothespin or two keys rubber-banded together.
If no spindle is available to turn, place an item in the latch's square or small rectangular hole. Use a screwdriver, spoon handle, nail file, or key. Rotate to open the latch.
Equipment / Tools
- Phillips screwdriver
- Cordless drill with bit extender (optional)
- Replacement mounting bolts (if needed)
Gather the Materials
To reassemble the doorknob, you will need to locate the inside door knob assembly, the outside door knob assembly, and the two long machine bolts (called mounting bolts) that hold them in place.
Identify the Materials and Their Positions
- Inside Knob: The inside door knob assembly has an attached rosette plate—a round decorative metal escutcheon. The rosette plate has two holes where the mounting bolts will be inserted. The knob may have a lock to lock the door from the inside.
- Outside Knob: The outside door knob assembly has a long, thin, square-shaped or flat metal piece in the center called a spindle. On either side of the spindle will be two long metal tubes with female threads to receive the mounting bolts.
- Latch: The latch is the metal piece that runs horizontally through the door knob hole in the door. It should be screwed firmly in place.
Install the Outside Door Knob Assembly
With the door open, place the outside door knob assembly on the outside of the door. The long spindle should first be inserted through the square or rectangle hole in the latch, followed by the two female-thread tubes which insert in two round holes.
Install the Inside Door Knob Assembly
While holding the outside assembly in place by hand, add the inside door knob assembly. The two holes on the inside assembly's rosette plate should match up with the outside assembly's threaded tubes.
Add the First Mounting Bolt
Grasp both assemblies with one hand (by reaching your hand over the edge of the door) or have an assistant do this for you. Add one mounting bolt. Screw it in by hand as far as you can before using the screwdriver. Do not drive it all the way in yet.
Add the Second Mounting Bolt
Insert the second mounting bolt the same way as the first. Screw it in by hand as far as possible, then stop.
Tighten the Both Mounting Bolts
With the Phillips screwdriver or a cordless drill with a bit extender, tighten both of the mounting bolts until the door knob assemblies are secured to the door.
When to Call a Professional
You may need to call a locksmith if you don't have all of the parts available. It can be difficult to identify and locate the correct replacement mounting bolts for the lock assembly.