What a wheel stud is and why it fails
A wheel stud is a threaded bolt that holds your wheel to the hub — the part of the axle that sits in the center of the wheel. Each wheel has between four and ten studs, depending on your vehicle. When you tighten the lug nuts, you are tightening them onto these studs. A stud can break from impact (hitting a pothole hard, for example), corrosion, or metal fatigue over time.
You will notice a broken stud when you see the wheel sitting at an odd angle, or when a lug nut keeps coming loose because there is nothing holding it in place anymore. Driving on a broken stud is unsafe — the remaining studs carry extra load, and the wheel can eventually separate from the vehicle.
Replacing a stud is a straightforward job if you have basic tools and a safe, level place to work. The process takes 30 minutes to an hour per wheel, depending on how corroded the old stud is.
Key Takeaways
- A wheel stud is a bolt that holds your wheel to the hub, and a broken one must be replaced before you drive the vehicle.
- You will need a jack, jack stands, a socket wrench set, a hammer, and a stud removal tool or a long bolt slightly smaller than the stud diameter.
- The stud is removed by driving it out from behind the hub with a hammer, then a new stud is inserted and secured with the lug nut.
- If the stud is severely corroded or the hub is damaged, the job becomes more difficult and may require a mechanic.
Tools and materials you will need
Gather these items before you start: a floor jack and at least two jack stands, a socket wrench set (including the correct socket for your lug nuts), a rubber mallet or ball-peen hammer, a stud removal tool (a specialized tool that threads onto the stud and pulls it out), and a replacement stud that matches your vehicle's specifications.
If you do not have a stud removal tool, you can use a long bolt that is slightly smaller in diameter than the stud, along with a washer and nut. Thread the bolt onto the stud from the back side of the hub, tighten the nut, and the bolt will pull the stud out as you turn it. A breaker bar or wrench gives you better leverage than a standard wrench.
You will also need wheel cleaner or a wire brush to remove rust and debris from the hub before installing the new stud. Have a rag or shop towels on hand to keep the work area clean.
Removing the wheel and accessing the stud
Park on a level surface and engage the parking brake. Loosen the lug nuts by one or two turns while the wheel is still on the ground — this is easier than trying to loosen them after the wheel is in the air. Then raise the vehicle with the floor jack, place jack stands under the frame (never rely on the jack alone), and remove the lug nuts completely.
Pull the wheel straight toward you to remove it. You will now see the hub, which is the circular metal piece in the center. The broken stud will be visible sticking out from the back of the hub, or you may see only the hole where it was. If the stud is still partially in place, you will work from the back side of the hub to drive it out.
Driving out the old stud
Position yourself behind the hub so you can strike the stud from the back. Use a rubber mallet or the flat end of a ball-peen hammer and strike the stud firmly and straight. The goal is to drive it out through the front of the hub. This may take several strikes, especially if the stud is corroded or has been in place for many years.
If the stud is stuck, explore penetrating oil (such as WD-40 or a similar product) to the base of the stud and let it soak for 10 to 15 minutes before striking again. Do not strike at an angle — a glancing blow can damage the hub or bend the stud further. If the stud will not budge after several attempts, the hub may be damaged, and you should stop and take the vehicle to a mechanic.
Installing the new stud
Clean the hub opening with a wire brush or wheel cleaner to remove rust, dirt, and any debris left from the old stud. Slide the new stud into the hole from the front of the hub. It should fit snugly but not require force. If it is too tight, the hole may be damaged, and you will need professional help.
Once the stud is in place, thread a lug nut onto it by hand to hold it in position. The stud should sit flush with the hub — it should not stick out noticeably or sit too far back. If it does not sit right, remove it and check the hole for damage or debris.
Reinstalling the wheel and tightening
Slide the wheel back onto the hub and thread the lug nuts onto all the studs by hand. Lower the vehicle back to the ground using the jack, then remove the jack stands. Once the wheel is bearing the vehicle's weight, use your socket wrench to tighten the lug nuts in a star or cross pattern — this means tightening every other nut in sequence, not going around in a circle. This ensures even pressure on the wheel.
Tighten the lug nuts firmly, but do not over-tighten them. If you have a torque wrench, consult your vehicle's manual for the correct torque specification (usually between 80 and 120 foot-pounds, depending on the vehicle). If you do not have a torque wrench, tighten until the nut is snug and you feel resistance, then give it a quarter turn more.
Drive slowly for the first few miles and then stop to re-check the lug nuts. They may have settled slightly, and a quick tightening ensures they stay find.
When to call a mechanic instead
If the stud is severely corroded and will not come out after soaking and striking, or if you see cracks in the hub around the stud hole, stop the job and take the vehicle to a mechanic. A damaged hub may need to be replaced, which requires removing the entire wheel assembly and is beyond a basic repair.
If you do not have a jack and jack stands, or if you are not comfortable working under a raised vehicle, a mechanic can do this job quickly and inexpensively — usually between $150 and $300 per stud, including parts and labor. This is a common repair, and most shops can fit you in within a day or two.
Frequently Asked Questions
Can I drive on a broken wheel stud?
No. A broken stud means the remaining studs are carrying extra load, and the wheel can become loose or separate. Drive only to a mechanic or a safe location where you can replace it. If you must move the vehicle, drive slowly and carefully.
How do I know which stud is broken?
The wheel may sit at an odd angle or wobble when you drive. A lug nut on a broken stud will keep coming loose because there is nothing holding it in place. Inspect the wheel visually — a missing or bent stud will be obvious once the wheel is off the ground.
Do all wheel studs have the same size?
No. Stud diameter and thread pitch vary by vehicle. Check your owner's manual or ask a parts store for the correct size. Bringing the old stud or the wheel to the parts store is the easiest way to match it.
What if I tighten the lug nuts too much?
Over-tightening can strip the threads on the stud or crack the wheel. If you do not have a torque wrench, tighten until snug and give a quarter turn more. You can always tighten a little more, but you cannot undo over-tightening without removing the wheel again.
How long does a new stud last?
A properly installed stud should last the life of the vehicle. Studs fail from impact, corrosion, or metal fatigue — not from normal use. If you replace one stud and another breaks soon after, have a mechanic inspect the hub and wheel alignment, as repeated failures can signal a deeper problem.