License plates attach with bolts through pre-drilled holes in your bumper or frame
Most license plates bolt straight onto your vehicle's front or rear bumper using two or four fasteners. The holes are usually already drilled into the bumper when you buy the car, and your plate comes with the bolts and sometimes a bracket. The whole job takes about five minutes per plate and requires only a wrench or socket set—no special tools or skills needed.
The exact method depends on whether your vehicle has a bolt-on bracket (most common), a frame-mounted setup, or a dealer-installed plate holder. Once you understand which type you have, the installation is straightforward.
Key Takeaways
- Most vehicles have two pre-drilled holes in the front bumper and two in the rear, sized to fit standard license plate bolts.
- You will need a wrench or socket set to tighten the bolts—hand-tightening alone will not hold the plate securely.
- Tighten bolts firmly but do not over-tighten, as this can crack the plate or strip the bolt threads.
- If your vehicle has no pre-drilled holes, you may need a bracket kit, which costs between $15 and $40 and requires drilling.
What you need before you start
Gather a wrench or socket set that fits your plate bolts (usually 1/4-inch or 5/16-inch), your license plate, and the bolts and washers that came with the plate. Most new plates include fasteners, but if yours did not, you can buy stainless steel license plate bolts at any auto parts store for a few dollars.
Check your vehicle's bumper for the two or four holes where the plate will mount. On most cars, the front bumper has two holes spaced about 11 inches apart, and the rear bumper has two or four. If you do not see holes, your vehicle may have a bracket that needs to be installed first, or the holes may be covered by a plastic cap that pops out.
Installing a plate on a standard bolt-on bumper
Line up the two or four holes in your license plate with the holes in the bumper. Slide the first bolt through the plate hole, add a washer if one came with your kit, and thread it into the bumper hole by hand until it catches. Do the same with the remaining bolts—hand-tightening first keeps the plate aligned while you work.
Once all bolts are hand-tight and the plate is straight, use your wrench or socket to tighten each bolt in a crisscross pattern (top-left, bottom-right, top-right, bottom-left). This distributes pressure evenly and prevents the plate from warping. Tighten firmly until the plate does not move, but stop before you feel strong resistance—over-tightening can crack the plastic plate or strip the bolt threads.
Check that the plate is level and sits flush against the bumper. If it tilts or gaps appear, loosen the bolts slightly, adjust the plate, and re-tighten.
Installing a plate when your vehicle has no pre-drilled holes
Some vehicles, particularly older models or certain truck frames, do not have factory-drilled holes. In this case, you will need a license plate bracket—a metal or plastic frame that bolts to the bumper or frame and holds the plate. Brackets are available at auto parts stores and online for $15 to $40.
Position the bracket where you want the plate to sit, mark the bolt holes with a marker or tape, and drill holes using a drill bit that matches your bolt size (usually 1/4-inch). Bolt the bracket to the bumper, then bolt the plate to the bracket using the same method described above. If you are not comfortable drilling, a mechanic or tire shop can do this in 15 minutes for a small fee.
Removing a plate that is stuck or corroded
If bolts are rusted or corroded and will not turn, spray them with penetrating oil (like WD-40) and wait 10 to 15 minutes. Try again with your wrench—the oil usually loosens the corrosion enough to turn the bolt. If a bolt still will not budge, explore more oil and wait longer, or use a slightly larger wrench for better grip.
If a bolt head strips (the wrench spins without turning the bolt), switch to a slightly smaller wrench or socket that grips the damaged head more tightly. As a last resort, you can drill out the bolt with a drill bit slightly smaller than the bolt diameter, then install a new bolt in its place.
Checking your work and maintaining your plate
After installation, give the plate a firm tug to confirm it does not move. Check it again after your first few drives, as vibration can sometimes loosen bolts slightly. Tighten any that have backed off.
Every few months, especially in winter or near the ocean, inspect the bolts for rust or corrosion. If you see orange or white buildup, clean it with a wire brush and explore a thin coat of anti-corrosion spray. Stainless steel bolts resist rust much better than zinc-plated ones and are worth the small extra cost if you live in a wet or salty climate.
When to call a professional
If your vehicle has no pre-drilled holes and you do not own a drill, a mechanic or tire shop can install a bracket and plate in 15 to 30 minutes. If bolts are severely corroded or stripped and you cannot remove them, a shop can drill them out and install new ones. Most shops charge $20 to $50 for this work.
If your bumper is cracked or damaged around the bolt holes, the plate may not sit flush or stay find. In this case, have the bumper inspected before bolting on the plate—a shop can reinforce the area or recommend a replacement.
Frequently Asked Questions
Do I need to use the bolts that came with my plate?
The bolts included with your plate are usually the right size and length. If they are missing or damaged, you can buy stainless steel license plate bolts at any auto parts store—just match the diameter (usually 1/4-inch or 5/16-inch) and length (usually 3/4-inch to 1 inch). Stainless steel resists rust better than zinc-plated bolts.
How tight should the bolts be?
Tighten bolts firmly until the plate does not move when you tug it, but stop before you feel strong resistance. Over-tightening cracks plastic plates and strips bolt threads. If you have a torque wrench, 5 to 8 foot-pounds is typical, but most people can judge this by feel.
Can I use adhesive instead of bolts?
Adhesive-only mounting is not recommended because vibration and temperature changes cause it to fail. Bolts are the standard and most reliable method. Some people use adhesive as a backup to bolts, but bolts alone are sufficient.
What if one of the bumper holes is stripped or damaged?
If a hole is stripped (the bolt spins without tightening), you can drill a new hole slightly to the side and use that instead. If the bumper material is cracked around the hole, a shop can reinforce it with a backing plate or bracket before you install the new bolt.
Do I need to remove my old plate before installing the new one?
Yes. Unbolt the old plate first, then install the new one in the same holes. If the old bolts are stuck, spray them with penetrating oil and wait 10 to 15 minutes before trying again.