Fix a loose cabinet knob or handle
A loose cabinet knob or handle is held by a machine screw that comes through the cabinet door or drawer front from the inside. Every pull works it a little looser. Tightening it from the inside fixes it for a while; a lock washer or a drop of removable threadlocker keeps it tight. If the knob spins even when the screw is snug, the screw is the wrong length or the hole in the wood has worn too big, and both are easy to fix. Knobs loosen one twist at a time. A lock washer stops that.
How cabinet knobs attach
Most cabinet knobs and pulls attach with a machine screw that passes through a hole drilled in the door or drawer front and threads into the back of the knob. A single-screw knob can spin; a two-screw pull usually works loose at one end first.
Screws back out from the constant twisting of opening and closing. A screw that's too short only catches a thread or two and strips easily, and one that's too long bottoms out before it pulls the knob tight. In softer wood or particleboard, the hole itself can wear oval, so the knob rocks even when the screw is tight.
Why knobs come loose
Twisting loosens it over time.
Too short strips; too long won't tighten.
Soft wood wears oval.
Nothing keeps it from turning.
| You notice | Likely cause | Start at |
|---|---|---|
| Knob wiggles a little | Loose screw | Step 1 |
| Comes loose again in weeks | Screw backing out | Step 2 |
| Spins even with the screw tight | Wrong screw length | Step 3 |
| Rocks in an oval hole | Worn hole | Step 4 |
Let's fix it
- Tighten it from the insideOpen the door or drawer and find the screw head on the inside, behind the knob. Hold the knob still from the front and tighten the screw until it's snug. Don't crank it, especially on thin doors, or you can strip the threads or dent the wood.
- Keep the screw from backing outIf it loosens again, take the screw out, slip a split lock washer or a toothed washer under its head, and tighten it again. Another option is one drop of blue removable threadlocker on the threads. Avoid red threadlocker or glue on the threads; they make the knob hard to remove later.
- Use the right length screwIf the knob still spins with the screw tight, check the length. The screw should go through the door and into the knob far enough to catch several threads without hitting bottom. Take the old screw to the hardware store, or use breakaway screws that snap off at marked lengths to fit thicker or thinner doors.
- Fix a worn-out holeIf the knob rocks because the hole in the wood has worn oval, remove the knob, glue in a short hardwood dowel or a few toothpicks, and trim them flush once the glue dries. Drill a new hole the same size as the screw through the center, from the front, with a scrap block clamped behind to keep the back from splintering.
- Cover damage with a backplateIf the wood around the hole is cracked or the finish is chewed up, a decorative backplate behind the knob or pull hides the damage and spreads the load. Make sure the new screws are long enough for the added thickness.
Watch it done
- The knob doesn't wiggle or spin
- It stays tight after a few weeks
- No new damage around the hole
If the door itself is the problem
If the whole cabinet door hangs crooked, we have a guide for fixing a crooked or sagging cabinet door.
If the drawer itself sticks or won't close, see the guide for a drawer that won't close all the way.
What a pro typically charges (a rough estimate; prices vary by area): A handyman typically charges $75–$150 for a visit to tighten or replace cabinet hardware, more for drilling new holes on many doors.
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Loose cabinet knob questions
Why do my cabinet knobs keep coming loose?
The screw backs out from twisting. A lock washer or a drop of blue threadlocker keeps it tight.
What size screw do cabinet knobs use?
Most use a machine screw sized for the knob; length depends on the door thickness. Breakaway screws fit several thicknesses.
Can I use glue to fix a loose knob?
Avoid gluing the threads. Use removable threadlocker so the knob can come off later.
How do I fix a cabinet knob hole that's too big?
Glue in a dowel or toothpicks, trim flush and redrill, or cover it with a backplate.
Why does my cabinet knob spin?
If it spins even when the screw is snug, the screw is the wrong length or the hole in the wood has worn too big.