Symptoms
- Lug wrench won't turn the nut even with full effort
- Nut seems rusted or corroded in place
- Wrench slips or rounds off the nut's edges
Likely causes
- CommonOver-tightened by an impact wrenchShops sometimes tighten lug nuts too much with air tools, making them hard to loosen by hand.
- CommonRust or corrosion on the threadsEspecially common in areas with road salt or high humidity.
- PossibleWrong size or worn lug wrenchA loose-fitting wrench can slip instead of turning the nut.
What to do
- Make sure the car is on the ground (not jacked up) for maximum leverage and stability before loosening nuts.
- Confirm the lug wrench fully seats on the nut and isn't rounding the corners.
- Turn counterclockwise using your body weight, standing on the wrench if needed and safe to do so.
- If it won't budge, try a breaker bar or a cheater pipe slipped over the lug wrench for more leverage.
- Spray penetrating oil on the threads and let it sit 10–15 minutes if rust is suspected, then retry.
- If the nut is rounded or still won't move, call roadside assistance or a mobile mechanic rather than risking injury.
Tools and parts
- Lug wrench or breaker bar
- Penetrating oil
- Cheater pipe (length of pipe for extra leverage)
Replacement lug nut if roundedSearch: “lug nut for [your car model]”
When to call a pro
If a nut is rounded off or you can't get it loose safely, a shop or roadside service has specialized tools like nut splitters or impact wrenches.
Safety
Use caution
Never get under a car that's only supported by a jack while trying to loosen a stuck nut; keep the wheel on the ground for leverage.