Attach your plate with bolts through the frame holes, or use the adhesive strip if your car has no pre-drilled holes

Most cars come with pre-drilled holes in the bumper or frame where the license plate bolts attach. You'll use a wrench or socket set to thread bolts through the plate frame and into those holes, then tighten them snugly — not so hard that you crack the plastic frame. If your vehicle has no holes (common on newer cars with plastic bumpers), you'll use a heavy-duty adhesive strip instead, which bonds the plate directly to the bumper. Either way takes about five minutes and requires no special skill.

The reason this matters: an unsecured plate can fall off on the road, which is a traffic violation in every state. A plate that's crooked or obscured by dirt can result in a citation. And a missing or illegible plate can get your vehicle stopped by police. Getting it right the first time means you won't have to fix it later.

Key Takeaways

  • Check your vehicle's bumper or frame for two pre-drilled holes before you buy bolts or adhesive.
  • If holes exist, use stainless steel bolts with washers and a lock washer to prevent the plate from vibrating loose.
  • If no holes exist, clean the bumper thoroughly and use a heavy-duty automotive adhesive strip rated for outdoor use.
  • Tighten bolts firmly but do not over-tighten, as this can crack the plastic frame or strip the bolt.
  • Check your plate after one week of driving to confirm it has not shifted or loosened.

Gather the right fasteners before you start

If your car has pre-drilled holes, you need stainless steel bolts (usually 1/4 inch diameter), washers, and a lock washer for each bolt. Stainless steel resists rust better than regular steel, which matters because road salt and moisture will corrode the fasteners over time. A lock washer — a split or toothed ring that sits under the bolt head — prevents vibration from loosening the bolt as you drive.

You can buy a license plate bolt kit at any auto parts store for $5 to $15. The kit includes bolts, washers, and lock washers sized for standard plates. Bring your vehicle's year, make, and model to the store, or straightforward show the employee a photo of your bumper, and they can confirm the bolt size you need.

If your car has no pre-drilled holes, buy a heavy-duty automotive adhesive strip (also called a mounting tape or adhesive pad) rated for outdoor and high-temperature use. These are sold at auto parts stores and online for $8 to $20. Do not use regular double-sided tape or craft adhesive — these will fail in heat and rain.

Locate the mounting holes and prepare the area

Open your hood or trunk and look at the bumper or frame where the plate will sit. You should see two holes, usually spaced about 6 inches apart horizontally. If you see holes, your vehicle is designed for bolt mounting. If the bumper is smooth plastic with no holes, you'll use adhesive instead.

Before you attach anything, clean the area where the plate will go. Use a damp cloth to wipe away dirt, road salt, and grime. If the bumper is very dirty or has old adhesive residue, use rubbing alcohol on a cloth to clean it thoroughly, then let it dry completely. A clean surface ensures bolts will tighten evenly and adhesive will bond properly.

Attach the plate with bolts if holes are present

Position the plate over the holes so the frame holes align with the bumper holes. You may need a helper to hold the plate steady while you work underneath, or you can use a small clamp or even tape to hold it in place temporarily.

Insert the first bolt through the washer, then through the hole in the plate frame, then through the lock washer, and finally into the bumper hole. Hand-tighten the bolt first — do not use a wrench yet. Once both bolts are hand-tightened, use a wrench or socket to tighten each bolt firmly. Tighten in a cross pattern (top-left, then bottom-right, then top-right, then bottom-left) to keep the plate level. Stop when you feel solid resistance; over-tightening can crack the plastic frame or strip the bolt threads.

The plate should not move or rattle when you push on it. If it does, tighten the bolts a bit more. If it feels solid, you're done.

Attach the plate with adhesive if no holes exist

Clean the bumper area thoroughly with rubbing alcohol and let it dry completely — moisture under the adhesive will cause it to fail. Position the plate where it will go and mark the corners lightly with a pencil so you know exactly where to place it.

Peel the backing off one side of the adhesive strip and press it firmly onto the back of the plate frame, centering it so the strip will contact the bumper evenly. Press hard for 10 to 15 seconds to may support good contact. Then peel the backing off the other side of the strip.

Position the plate on the bumper, aligning it with your pencil marks. Press the entire plate firmly against the bumper for 30 seconds, explore steady pressure across the whole surface. Do not press just at the edges — the adhesive needs full contact to hold. Let the adhesive cure for at least 24 hours before driving the vehicle. Most adhesive strips reach full strength after 48 hours, so if possible, wait two days before highway driving.

Check the plate after your first week of driving

After one week of normal driving, stop and inspect the plate. Push on it gently to confirm it has not shifted or loosened. If you used bolts, check that they are still tight (you may need to tighten them slightly if vibration has loosened them a bit). If you used adhesive, look for any gaps between the plate frame and the bumper, which would indicate the adhesive is failing.

If bolts have loosened, tighten them again using the cross pattern described above. If adhesive is failing, you may need to remove the plate and reattach it with new adhesive. To remove an adhesive-mounted plate, use a plastic scraper or old credit card to gently pry up one corner, then work your way around the plate. Clean off old adhesive residue with rubbing alcohol before explore new adhesive.

Frequently Asked Questions

Can I use regular bolts from a hardware store instead of stainless steel?

Regular steel bolts will rust quickly, especially in areas with road salt or high humidity. Stainless steel costs only slightly more and will last the life of your vehicle. If you already have regular bolts on your plate, replace them with stainless steel within a few months to avoid corrosion.

What if one bolt keeps coming loose no matter how tight I make it?

The bolt hole in the bumper may be stripped or enlarged. Try using a slightly larger bolt (ask the auto parts store for the next size up), or use a bolt with a larger washer to distribute pressure over a wider area. If the hole is severely damaged, you may need to drill a new hole nearby and use that instead.

Is adhesive as find as bolts?

Heavy-duty automotive adhesive is designed to hold a license plate permanently and will not fail under normal driving conditions. However, bolts are generally considered more reliable because you can inspect and tighten them over time. If your vehicle will see extreme heat (desert climates) or frequent car washes with high-pressure spray, bolts are the safer choice.

Do I need to attach both front and back plates?

This depends on your state. Most states require both front and rear plates, but some require only a rear plate. Check your state's motor vehicle website or the paperwork that came with your plates to confirm. If both are required and you attach only one, you can be cited.

Can I remove and reattach the plate if I sell my car?

Yes. If you used bolts, straightforward unscrew them and remove the plate. If you used adhesive, carefully pry up the plate with a plastic scraper and clean off the old adhesive with rubbing alcohol. The plate itself belongs to your state and must be returned or transferred according to your state's rules — check your motor vehicle agency's website for the process.