Properly selected and installed frame for the car number is not just an element of decor, but an important detail that affects the safety and legal purity of the vehicle operation. Many car owners underestimate the importance of fasteners, believing that it is enough to simply buy any bolts in the nearest hardware store. However, the use of poor-quality or inappropriate fasteners can lead to the loss of the license plate on the go, the appearance of rusty streams on the body and, most unpleasantly, to fines from traffic police officers.
In this article, we will discuss in detail which number-frame For modern cars, it is necessary to choose a material that is resistant to an aggressive environment and avoid typical errors in installation. You will learn about the standards of sizes, features of threads and methods of protection against corrosion, which will prolong the life of your tuning. We will also touch on the legality of the installation of frames with logos and additional elements.
Incorrect installation often causes damage to the paint coating of the bumper or splasher. To avoid expensive repairs and hassle with the search for a lost number, you need to approach the issue of choosing fasteners with technical literacy. Let’s look at the main parameters that should be considered first.
Standards and dimensions of fasteners
The main document regulating the installation of state registration marks in Russia is GOST R 50577-2018. According to this standard, the openings in the license plate and frame must coincide, and the fixture must ensure reliable fixation. The standard diameter of the hole in the license plate is 9 mm, which dictates the use of bolts with threaded M6 or, in rare cases, M5 using transition washers.
The length of the bolt is a critical parameter that varies depending on the thickness of the bumper and the design of the frame itself. A too short bolt will not be able to fix the design, and an excessively long one can rest on the internal elements of the bumper, radiator or wiring, which will lead to deformation of the plastic or damage to the car systems. The optimal length is usually between 10 and 20 mm, but the exact value depends on the specific model of the car.
Always measure the thickness of the bumper at the mounting site before buying bolts, adding to the resulting value of 5-7 mm by the thickness of the frame and nuts.
For front rooms, special bolts with a flat hat or even without a hat (semi-circular) are often used to avoid overlapping numbers and letters. The back numbers are usually attached to standard turnkey bolts. It is important to consider that the thread step must also meet the standard so that the nut is screwed up without distortions and jamming.
- 🔩 The diameter of the thread: The standard is the M6, less common is the M5 for passenger cars and the M8 for trucks.
- 📏 Length of the rod: It varies from 10 to 25 mm depending on the design of the bumper.
- 🔑 Head type: Hexagonal, under a cross screwdriver or secret for the front numbers.
The use of non-standard fasteners can cause the frame to dangle, creating rattles when moving. This not only irritates the driver, but also contributes to the rapid wear of the holes in the license plate, which can be regarded as damage to the state registration plate.
Materials and corrosion protection
Car fasteners are exposed to aggressive environmental influences: rain, snow, reagents on the roads, temperature changes and mechanical impacts of gravel. Conventional steel without coating rusts in one winter season, turning into an unaesthetic stain and losing strength characteristics. So the choice of material is a matter of durability.
The most common option is zinc-coated steel (galvanic galvanic galvanic). Such bolts have a characteristic silvery shine and provide basic protection. However, for regions with harsh climates and plenty of road salt, this may not be enough. A more reliable solution is the use of stainless steel brand A2 (304) or A4 (316).
⚠️ Attention: Never use conventional black screws without corrosion-resistant coating to fasten the frames. They will rust inside the bumper plastic, and unscrewing them without damaging the car will be almost impossible.
There are also bolts with additional decorative coating, for example, chrome or painted black (black edition). It is important to understand that the paint on the bolts is only a decor, and if there is no zinc layer under it, such fasteners will quickly become useless. Chromium provides good protection, but costs more.
When choosing a stainless fastener, make sure it is indeed non-magnetic or weakly magnetic, which indirectly indicates the chromium and nickel content. Cheap analogues from the "Chinese silumin" or low-quality alloy can burst when puffed or from vibration on the track.
Design features and types of heads
The design of the bolt head determines not only the appearance, but also the ease of installation, as well as the degree of protection from unscrewing. Front license plates often require special bolts with a reduced head height or a completely flat top to not cover the characters on the number, especially the top line with the region code.
In recent years, bolts with decorative stubs have gained popularity. Such plugs can be made in body color, have a logo of the car brand or be simply chrome. They are put on the bolt head after installation, hiding the technical appearance of the fastener and giving the car a more neat look. However, it is worth remembering that such plugs can fly off when washing under high pressure.
There are also anti-vandal bolts that require a special key to unscrew. This is protection against theft of license plates, which is especially important for owners of expensive cars or in disadvantaged areas. The kit usually consists of 4 bolts and one key-nozzle.
What is an anti-vandal bolt?
The anti-vandal bolt has a hat with a hidden profile (star with a pin, polyhedron), which cannot be unscrewed with a standard set of tools. To dismantle requires a special key, which comes in the kit.
The choice of head type also depends on how deeply the seat in the bumper is drowned. If the hole is deep, then a bolt with a high turnkey head will be more convenient to twist than a low bolt under a screwdriver, which can simply slip.
Instructions for correct installation
The process of installing the frame and license plate requires accuracy and compliance with a certain sequence of actions. Errors at this stage can lead to cracks in the bumper plastic or a skewed number, making it unreadable for infringement cameras.
Before starting work, it is necessary to prepare all tools: a set of keys or screwdrivers, a soft rag for cleaning the surface and, possibly, a sealant. Make sure the bumper surface is clean and dry. If you are installing the frame for the first time, check if it covers important elements such as parking sensors or air intakes.
☑️ Preparation for installation
When you are curling, do not make excessive efforts. The bumper plastic can crack if you pull the fastener. It is optimal to use a dynamometer key if possible, or simply rely on a sense of proportion, tightening the bolts to the point without fanaticism. It is recommended to use washers-grovers or rubber seals to prevent self-unwinding from vibration.
If the holes in the frame and number do not match perfectly, in no case do not try to force the metal of the room or expand the holes in the bumper. It is better to purchase a universal frame with adjustable mounts or drill new holes in the frame itself, observing symmetry.
Typical errors and their consequences
One of the most common mistakes is to ignore rubber seals. Installing a metal frame directly on the paint coating of the bumper leads to the fact that moisture and dirt accumulate under the frame. Over time, this causes corrosion of the bumper metal and swelling of the paint. Always use rubber or silicone pads between the frame and the body.
Another mistake is to use too long bolts “by eye”. Owners often don’t check what’s on the back of the bumper. In modern cars, there can be parking sensors, wiring, pipes of the headlight washer or elements of the cooling system. A long bolt can pierce the radiator pipe, which will lead to leakage of antifreeze and overheating of the engine.
| Mistake. | Consequence | Decision |
|---|---|---|
| Absence of sealant | Corrosion under the frame, scratches of the LCP | Use rubber pads |
| Too long bolt. | Damage to internal vehicle components | Measure the depth, shorten the bolt. |
| Weak puff. | Losing number, rattling | Use a grover or carving fixator |
| Disturbance | Fine for unreadable number | Control symmetry during installation |
There is also a frequent error in quality savings. Cheap frames made of silumin or thin steel quickly deform and rust, losing their functionality. As a result, you have to buy a new frame and a new set of bolts, which in the end is more expensive than the initial purchase of quality materials.
Legal aspects and requirements of the traffic police
Russia has strict rules regarding the setting of frameworks. According to the legislation, the frame should not cover the numbers and letters on the license plate, as well as the region code. Closing even one symbol may entail a fine under part 4 of article 12.2 of the administrative code of the Russian Federation, which is 2000 rubles, and in some cases, deprivation of rights.
In addition, the frame should not include labels that distract attention or advertise third-party organizations if they overlap the view or are perceived as part of the room. It is forbidden to use frames that allow you to quickly change numbers or hide part of them. The fastening must be reliable and avoid spontaneous unwinding.
The frame should not cover any symbols of the number, including the region code and the flag. The penalty for this violation is quite real and is issued often.
The traffic police during the inspection pay attention to the condition of the fastener. If the bolts are rusted so much that the number is dangling or skewed, it can also be a reason to stop and issue a warning or penalty. Therefore, regular check of bolts and their replacement at the first signs of corrosion is not only a matter of aesthetics, but also legal security.
It is also worth noting that the use of frames with symbols of foreign states or organizations that do not correspond to reality can be regarded as a violation of the rules. It is best to use neutral frames without unnecessary inscriptions or with the logo of the car brand, if it does not overlap important elements.
FAQ: Frequently Asked Questions
Can you use conventional screws to fasten the frame?
Using conventional construction screws is strictly not recommended. They do not have the necessary protection against corrosion, rust quickly and can damage the structure of the bumper plastic when screwed in, as they are not designed for collapsible joints. It is better to use special bolts with nuts.
What size of bolts is needed for most foreign cars?
For most European and Korean cars, the standard is the 12-16 mm M6 bolts. However, Japanese and American brands may have different dimensions, so it is always better to pre-measure the depth of the hole or consult the manual.
What to do if old bolts are rusted and not unscrewed?
Do not try to break them by force so as not to damage the bumper. Treat the connection with penetrating lubricant (such as WD-40) and leave for 15-20 minutes. If the bolt cap has licked, you can try to carefully drill the center of the bolt or use an extractor.
Do I need to smear the bolts before installation?
Yes, it is recommended to lubricate the bolt thread with copper lubricant or graphite lubricant. This will prevent the metal from boiling, protect against corrosion and will allow in the future to easily unscrew the fastener if you need to change the number or frame.
Is there a penalty for a frame with the brand logo?
The frame itself with the brand logo (e.g. BMW, Toyota) is not prohibited, unless it covers the number symbols, the region code and the flag. However, if the logo or inscription on the frame overlaps at least part of the sign, the fine will be issued lawfully.