Red nail polish

Let it be a purely technical note. Separately, I wrote about a curious story that occurred due to improper use of thread lock – I recommend to get acquainted. Here, only technical information, albeit a bit. The knowledge gained from the note will be able to protect you from the misuse of such a special liquid as a thread lock.

Red nail polish

What are the clamps and on what principle work

Thread locks – liquids are quite dangerous. Incorrect use of thread lock is guaranteed to lead to undesirable consequences. The thread locks are red and blue (green). They differ in the principle of loosening:

  • Red (one-piece) must be heated to a high temperature; without this, it is impossible to unscrew the bolt with such a lock. Maintain a high temperature. They are used, as a rule, on rotating and high-temperature assemblies (for example, brakes or a bolt that secures the main pulley to the crankshaft).
  • Blue (detachable) unscrew with a lot of effort. Used on low-temperature nodes, where the probability of unscrewing is not great. As a rule, they protect against unscrewing when exposed to vibration (for example, mounting the bracket directly to the engine).

Red nail polish

The classification does not always match the color, so the main criterion is split / non-separable. Also note that in recent times, along with the separability, clamps with varying degrees of fixation have also begun to be produced, while remaining detachable or non-detachable.

The principle of operation is simple. A liquid is applied to the surface of the bolt, which, when dried, binds two metal surfaces. A primitive thread lock can be ordinary nail polish. But it is worth using it only where unscrewing is not critical. In critical assemblies, use only a specialized clamp. Its cost is not high. A maximum of 150 rubles for a tube, which is enough for a large number of repairs.

How to apply

First, you need to be sure that this bolt simply requires the application of a thread retainer. To find out, you need to find a repair manual for your car, and read. Usually this information is written in the same section as the tightening torques.

Red nail polish

If there is confidence, then open the tube with the retainer, and apply on the thread, in the place of the bolt where the nut will be, a strip of approximately 5 mm (usually one drop). When you tighten the bolt, the retainer itself is distributed over the adjoining surface.

How to unscrew

The blue retainer should unscrew without problems. In extreme cases, it is possible to heat the part slightly, but in practice it rarely comes to this.

With the red latch often enough to work hard. The first problem is to find out about the presence of a red latch. If you know that on any knots to be repaired there is a red thread retainer, and you give the car to the car-care center, warn the craftsmen not to accidentally turn the head or the nut or bolt. This is usually recognized by the fact of unscrewing. It greatly helps to cope with the red latch heating the parts with a gas torch. The danger here is that rarely is there anything plastic around the heated part. To avoid melting something, make a screen out of asbestos, or at least tin, so that the direct flame does not fall outside of the heated part. And make sure that nothing plastic is attached to the heated part. When the part is hot, you need to quickly unscrew the bolt, as the red latch may seize again when it cools.


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