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The license plate screw size for the 2016 Mazda CX5 is M6, which corresponds to a 6mm thread pitch. Typically, a screw that is approximately 1/2 inch long is sufficient to secure your plate, but if you have a plate frame or other accessories, you may need a longer screw. I suggest using a thread locker on your license plate screws to prevent them from coming loose while driving, and to deter theft, as thread glue can be helpful for this purpose. Using a less common screw head like Torx can also offer additional protection for your plate.
The correct license plate screw size for a 2016 Mazda CX 5 is designated in the owner's manual as M6, which is a metric screw measuring 6 millimeters in diameter.
The initial bolts are made of nylon with slotted heads, measuring 6mm x 1.0 pitch and 3/4 inches long. These bolts thread into a steel welded nut. I had to drill out the nylon after the screws broke and then use a 6mm tap to clean the steel threads on the nut. To prevent similar issues in the future, I will apply neverseez to either a stainless steel bolt or a nylon bolt.