What size bolt holds a license plate?
The typical bolt size for mounting a US license plate is 1/4‑14 UNC screws, usually about 1/2 inch to 1 inch long, with two screws per plate. In other regions, metric sizes such as M5 or M6 are common, and exact lengths vary by vehicle and mounting hardware. Always check your owner’s manual or local regulations for the precise requirement.
Regional standards and common sizes
License plate mounting hardware varies by country and vehicle. The following outlines the sizes you’re most likely to encounter.
- United States and Canada: 1/4-14 UNC screws; typical lengths range from about 1/2 inch to 1 inch, used with two screws and sometimes washers or anti‑theft hardware.
- Europe, United Kingdom, Australia, and many other markets: metric screws, commonly M5 or M6; lengths vary depending on plate thickness, frame, and bumper clearance.
Note that some cars use specialized or tamper‑resistant fasteners, and aftermarket frames can alter the required length. Always confirm with your owner’s manual or dealer before buying hardware.
How to determine the exact bolt size for your vehicle
To ensure you buy the correct hardware for your license plate, follow these steps:
- Inspect the current fasteners: look at the screws holding the plate or the mounting holes in the plate/frame to identify the thread type (imperial vs metric) and head style.
- Measure the diameter and pitch: use a caliper or thread gauge to determine if it’s 1/4-14 UNC or a metric M5/M6 size. If you’re unsure, bring a sample screw to a hardware store.
- Check the vehicle manual or the mounting kit that came with the car: many manufacturers specify the exact bolt size and length recommended for your model.
- Choose length that clears bumper and frame: ensure the screw is long enough to secure the plate but not so long that it protrudes or damages the bumper.
With the right hardware, the plate will mount securely without damage or vibration. If you install a frame or security screws, verify compatibility with your vehicle's holes and clearance.
Summary
Across regions, you’ll commonly encounter two standard approaches: US/Canada use 1/4-14 UNC bolts, while many other markets use metric M5 or M6 screws. Lengths vary based on plate thickness and mounting hardware. Always verify with the vehicle’s manual or dealer and consider any frames or anti‑theft hardware when choosing bolts.
Are license plate screws M6?
The M6-1.0 x 16mm Phillips Pan Head License Plate Screw is an essential component designed specifically for securing license plates to vehicles, ensuring that they remain safely attached while driving.
What type of screws do you need for your license plate?
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What tools do you need to attach a license plate?
You will need a Phillips or a flathead screwdriver, your new car tag, and the proper screws. If your vehicle is brand new, the screws for the license place holder may be located in the glove compartment or console.
What size bolts are used for license plates?
The most common sizes for license plate bolts are #14 x 3/4 inch for many domestic vehicles or M6 x 20mm for many metric vehicles, though it is best to check your specific vehicle's requirements before purchasing. The #14 size has a diameter of roughly 1/4 inch, while the M6 is a metric size measuring 6mm in diameter.
| Size | Description | Common Applications |
|---|---|---|
| #14 x 3/4 inch | A common screw size for American vehicles, with a thickness around #14 and a length of 3/4 of an inch. | Ford, Chevrolet, GMC, Dodge, and Chrysler vehicles. |
| M6 x 20mm | A metric size, where "M6" is the 6mm diameter and "20mm" is the length. | Toyota, Honda, and Nissan vehicles. |
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Important Considerations:
- Check your vehicle: Some vehicles, especially those with specialized bumpers or trim, may require different fasteners.
- Consider the material: Screws are often made of stainless steel for rust resistance, but you can also find nylon or plastic options.
- Note the threading: The type of threading you need depends on whether your vehicle has pre-threaded holes or if you will be using inserts (like the nylon ones that come with many aftermarket kits).
