What is the length in mm of an M6 license plate screw?
3 Answers
M6 bolts have a diameter of 6mm and a length of 80mm. The function of license plates: A license plate is an identification number for vehicles, serving the same purpose for a car as an ID number does for a person. License plates provide numbering and information registration for vehicles, with their primary function being to identify the vehicle's region of registration through the plate number, and to enable tracking of the vehicle's owner and registration details. Motor vehicle license plate numbers: Motor vehicle license plate numbers consist of a registration authority code and a plate number. For automobile-class plates, the number is structured in two rows - the upper row shows the vehicle registration authority code, while the lower row displays the plate number. The registration authority code consists of 2 characters, combining a Chinese character and an English letter. The Chinese character represents the abbreviation of the province, autonomous region, or municipality directly under the central government, while the English letter indicates the code of the vehicle management office.
Last time I changed my license plate myself, I checked and found that M6 screws refer to those with a thread diameter of 6mm, commonly available in lengths ranging from 15 to 25mm. I bought a pack of 20mm ones, which fit the license plate holes perfectly. If they're too long, they can damage the paint by pressing against the rear panel, and if they're too short, they might not secure the plate firmly, leading to loosening. Although license plates are small components, they are very important because if the screws rust or fall off while driving, losing the plate can result in fines and pose safety hazards. It's advisable to measure the hole depth before selecting screws—for example, choose 20mm screws for a 15mm deep hole to allow some extra length for better fixation. I used stainless steel ones for better corrosion resistance and durability. When installing, tighten them with a Phillips screwdriver, but don't over-tighten to avoid breaking them. Paying attention to these small details can save you from future hassles and unnecessary trips to the repair shop.
As someone who often DIYs car repairs, I believe the length of license plate screws matters. M6 indicates a thread diameter of 6mm, typically 15-25mm long, and I recommend the standard 20mm length. Most license plate holes are about 18mm deep, so choosing 20mm leaves some room to prevent loosening. Adding a lock washer during installation is even better—it absorbs vibrations and prevents the screw from gradually turning loose. Screws that are too long can pierce through the license plate backing, while ones that are too short may come off. I once used 16mm screws and found they loosened quickly. Measuring the hole depth with a ruler is simple, then pick the right screw. Secure license plate mounting is crucial for road safety, as a loose plate could cause accidents. By the way, rusty screws are hard to remove, so opt for stainless steel or galvanized ones for longevity. As for tools, a Phillips-head screwdriver will do—just don’t overtighten and damage the threads.
