Mechanics overtightening wheel lug nuts with impact wrenches
Impact wrenches often over-torque wheel lug nuts far past proper specifications. This makes removing wheels nearly impossible during a flat tire and risks damaging the studs or warping the rotors.
What the numbers show
Counted from the threads quoted below. How we count
- Most of it landed at once — the busiest month was October 2026, with 8 people.
- This comes up 20.8× more often in r/AskMechanics than across the site as a whole.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
- 1giving mechanics drinks or tips as a polite request to properly torque lugsDid this help you?
- 2doing maintenance oneselfDid this help you?
- 3Tightening lug nuts as much as possible using a breaker bar or trunk wrench by feel.Did this help you?
- 4Checking lug nuts after driving for a little bit to ensure they are not loose.Did this help you?
- 5Using a 4-way iron or hand tools completelyDid this help you?
- 6Using an impact wrench only to lightly seat lug nuts and finishing with a torque wrenchDid this help you?
- 7Setting an electric impact to a low torque setting to avoid over-tighteningDid this help you?
- 8Using a breaker bar to loosen the locking wheel nuts manually before using an impact gun for the restDid this help you?
- 9Removing the wheel locks entirely from personal vehiclesDid this help you?
- 10Being extra mindful and careful with the impact gun depending on the style of the locking nutDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“I'm guess he doesn't want someone to ham with the impact putting the lugs back on at 200ftlb.”source ↗
“Putting them back is a bit different. Torque em to spec for my customers but give a couple ugga duggas on my own truck.”source ↗
“I use it to put them back on only to seat them, then out comes the handy-dandy torque wrench to finish the job”source ↗
“The issue is putting them back on”source ↗
“I might not do it outside of the shop because they will break someday.”source ↗
“On and off with an impact, although I make sure to start the lug nuts by hand. I don't cross thread and I know my tools. My impact gun doesn't go beyond the torque value as I still need to turn the lugs +30 degrees to get the torque set.”source ↗
“I do use an impact for lug bolts to take wheels off. I also use it to put them back on, but don't give it the full ugga dugga. Finish it off with a torque wrench.”source ↗
“I never use an impact on the locking ones. Too much to risk damaging a lug or the socket on a customer’s cars.”source ↗
“I have never used a torque wrench on my lug nuts. I just tighten them as much as I can with an 18 inch breaker bar (or the lug nut wrench in the trunk if I get a flat tire) without straining too hard to do it.”source ↗
“Is this what most people do at home? Is this okay, or do I really need to get a torque wrench?”source ↗
“do people use impacts on their locking wheel nuts? i tried and it slipped and i stopped as i didn’t want to round the locking wheel nut.”source ↗
“it seems really tedious to need to use a breaker bar on those 4 lock nuts to be able to just impact off the others? do people usually use their impact?”source ↗
Where this came up
People with this problem also raised
- 4What to do if you overtightened a suspension bolt
- 3How to remove a stripped or over tightened lug nut when tools break
- 5How to torque bolts without a torque wrench
- 2How to remove a bolt when the welded nut spins
- 4How to tighten nuts in tight spaces where a wrench won't fit
- 17Why am I paying for broken bolts during a car repair?