Theft of wheels and tires is an unpleasant reality for many car owners, especially at night or when parking in disadvantaged areas. To protect expensive property, drivers resort to installing special anti-theft bolts, which are commonly called “secrets”. It is a simple yet effective device that makes it impossible to dismantle the wheel without a special key of a unique shape.
The principle of operation of such bolts is based on non-standard geometry of the hat, which does not allow them to be unscrewed with a conventional end key or head. Unique drawing The faces or inner projections correspond to only one specific key coming in the kit. Even if an attacker tries to use a gas key or a powerful screwdriver, he will most likely only damage the bolt, but will not be able to unscrew it, which will scare off a thief looking for quick profit.
In this article, we will discuss in detail how to choose reliable protection, what types of fasteners exist and why it is important to pay attention to the quality of the metal. You will learn about the intricacies of operation and how to prevent a situation where even the owner himself will not be able to remove the wheel due to the loss of a special key. Wheel protection It should be reliable, but should not become a problem in an emergency.
Principle of operation and design features
The basis of any secret is a bolt with a modified head. Unlike the standard fastener, which has a hexagonal or star-shaped (Torx) cap, the anti-theft element has a complex relief. Matching profile The key and bolt should be perfect, otherwise you will not be able to turn the fastener. There are many variations of drawings, from simple polyhedra to complex shapes with floating elements inside.
The fabrication material plays a critical role in the effectiveness of protection. Quality models are made of hardened steel with a high tensile strength. This is necessary so that the bolt does not burst with a sharp jerk with the collar and does not deform from attempts to drill. Cheap soft metal analogues can be cut or rolled even without a special key, making them useless.
⚠️ Warning: Never use a shock screw to twist secretions at high speed. Overheating and impact load can lead to "feeding" of the bolt or damage to the internal mechanism of the key, after which it will be impossible to unscrew it.
The design also involves the presence of a protective cap or a special sleeve that closes access to the faces of the bolt. This prevents the attempt to select a similar head or the use of an extractor. Some manufacturers are implementing floating-piece c the bolt head, which are twisted when trying to capture a conventional tool, completely blocking the transfer of force.
Buy secretaries only in specialized auto parts stores. In the markets, it is too likely to encounter a fake made of silumin, which will burst at the first serious delay.
The main types of anti-theft bolts
The automotive accessories market offers a wide range of protective fasteners. The differences lie not only in the brand, but also in the type of head performance. Understanding these differences will help you choose the best option for your car and the type of drives.
The most common types are:
- 🔑 Polyhedra: A classic version with 12 or more faces that is difficult to grasp with a standard head of 17 or 19 mm.
- 🌀 Spiral and curvilinear drawings: complex relief, which is almost impossible to reproduce or pick up an analogue.
- 🔐 Leaked (with holes): on the hat there are holes of different depth and diameter, the key has response pins.
- 🌀 With a floating ring: The outer ring is freely rotated, not allowing the tool to catch, and the working profile is hidden inside.
Separately, it is worth highlighting the bolts with eccentric. They work on the principle of lock: the key is inserted and turned, unlocking the internal mechanism, after which it becomes possible to unscrew. Such systems are considered to be one of the most reliable, but they are much more expensive than conventional analogues.
When choosing, it is also important to consider the length of the threaded part and the pitch of the thread. Incorrectly selected bolt may not reach the hub or, conversely, rest ahead of time, which will lead to poor fit of the disk. For cast discs, longer bolts or special nuts are often required if we are talking about stamped versions with caps.
Advantages and disadvantages of using
Installing secretions has both obvious advantages and certain disadvantages, which are worth knowing in advance. The main advantage is, of course, the increased level of security. Statistics show that thieves rarely contact cars protected by anti-theft fasteners, preferring to spend time on cars without protection.
In addition, quality bolts serve as an excellent visual deterrent measure. Noticing the non-standard heads, the attacker understands that for theft he will need special tools and time, which he does not have. Also, secretions help to fix the disk more reliably, preventing its spontaneous unwinding from vibration, if the thread is made qualitatively.
However, there are also disadvantages:
- 📉 Risk of losing the key: The loss of a special key makes the replacement of the wheel a complex technical problem requiring drilling or the use of powerful skippers.
- ❄️ Contamination of the mechanism: dirt and reagents can clog the bolt profile, making it impossible for the key to fit tightly.
- 💰 Cost: Good sets of 4 bolts are much more expensive than conventional fasteners.
- 🔧 Difficulty balancing: Some models have a shifted center of gravity, which may require more careful balancing of the wheel.
⚠️ Warning: If you lose the key to the secret, do not try to knock the wheel out with a sledgehammer - this can damage the hub bearing or brake disc. It is better to contact a specialized service, where the bolt is carefully drilled.
It is important to understand that secretion is not a panacea. It only increases the time it takes to steal. If the car is left in a remote place for a long time, no bolts guarantee 100% safety of the wheels, but they will definitely weed out opportunistic thieves.
How to choose the right set of secretes
Choosing the right set is a responsible task. First of all, you need to know the parameters of the regular fastener of your car. These are the diameter of the thread (e.g., M12 or M14), the thread pitch (1.25 or 1.5), the length of the bolt, and the type of cone or sphere of the seat. The inconsistency of these parameters can lead to damage to the disc or hub.
Pay attention to the brand and the country of manufacture. Market leaders are considered companies. Farad, Starke, Truzowichcock (for commercial vehicles) and other well-known brands. They provide quality certificates and unique codes for key recovery in case of loss (when registering on the manufacturer’s website).
When buying, check the equipment. The set usually has 4 bolts and one key. Sometimes there are sets of 5 or 6 pieces for SUVs with two spare parts. Make sure the key is conveniently sized to work in a limited wheel arch space.
Can I make the key to the secret yourself?
Theoretically, with a 3D scanner and a CNC milling machine, yes. However, the cost of manufacturing one such key in the workshop will exceed the cost of buying a new original set of bolts, so for a conventional car theft is impractical.
Table of comparison of popular types of protection
For convenience of choice, we will give a comparative characteristic of the main types of anti-theft bolts presented on the market.
| Type of bolt | Level of protection | Difficulty |
|---|