In most places, license plates are attached with standard screws rather than specialized hardware. The usual options are common machine screws like #6-32 in the United States or metric M6 equivalents elsewhere, with lengths commonly 1/2" to 3/4". Some cities or states require tamper-resistant screws for security.
The question invites a closer look at what hardware is appropriate, how to choose it, and how legal requirements vary. Here is a detailed briefing on typical hardware, regional considerations, and practical tips for mounting license plates safely and legally.
Common hardware for license plates
Before listing typical options, note that the exact choice depends on factors such as the vehicle's mounting holes, bumper design, whether a frame is used, and whether a frame affects screw length. The following are the most common configurations encountered by drivers and installers.
- US standard: #6-32 machine screws are widely used. Typical lengths range from 1/2" to 3/4" to accommodate plate thickness and bumper design; stainless steel is common to resist corrosion; heads are usually shallow (pan or button head) and compatible with most frames.
- Metric and international standard: In Canada and many European markets, license plates often use M6 x 1.0 screws, with lengths adjusted to plate thickness and mounting surface.
- Security and anti-theft options: Some jurisdictions or property owners require tamper-resistant screws (for example, one-way screws, security Torx) to deter plate theft. If you choose these, ensure you have the correct driver tool.
- Frames and alternate mounting: If you use a frame or a non-standard bumper, you may encounter self-tapping screws or bolts with nuts behind the plate; the length may need to be longer to pass through the frame material.
Whichever option you choose, ensure that the screws fit the mounting holes, do not protrude excessively, and are compatible with the plate and frame materials to avoid paint damage or chrome wear.
Regional rules and practical considerations
License plate mounting rules vary by country, state, or municipality. Many U.S. states require front plates, others do not; some locales mandate visible screws or the use of anti-theft hardware. Always verify local regulations through the DMV or official municipal codes to ensure compliance and to understand whether tamper-resistant screws are mandated or prohibited in your area.
Tips for choosing screws
Key considerations when selecting license plate screws and hardware before installing.
- Check your vehicle’s owner manual or dealership for the recommended screw size and mounting method.
- Use corrosion-resistant hardware (stainless steel or coated steel) to withstand road salt and weather.
- Match the thread to the mounting holes (common options: #6-32 in the U.S., M6-1.0 elsewhere).
- Consider anti-theft screws only if permitted by local rules, and ensure you have the proper driver.
- Use washers to protect the plate and paint from scratching; ensure no protruding screws contact wiring or sensors.
Following these guidelines helps ensure a secure, compliant installation that lasts for years.
Summary
In most places, license plates can be mounted with standard screws of a conventional size (such as #6-32 in the U.S. or M6 in metric regions). The exact hardware is influenced by local laws, vehicle design, and whether a frame is used. When in doubt, consult your local DMV or dealership and consider anti-theft screws only if permitted; prioritize corrosion resistance and proper length to avoid damage.