Carrying out an independent car repair some time after its acquisition, you can stumble upon very remarkable hardware that is marked with some kind of paint. A number of motorists mistakenly believe that such marks indicate previous repairs. In fact, not so, and the paint is applied to the bolts in factories. It's time to find out why they need it.
The biggest irony in this matter is that the painted bolts in the car's structure are not actually marked with paint at all. You should not worry, if you had to see such a hardware during the repair, then you can be almost completely sure that it is a factory one. This is because the substances of red, blue, green, yellow colors on the surface of the part are a thread lock.
Thread clamps are used not only for assembling cars, but also for many other plumbing work. As you might guess from the name, these substances are used to improve the quality and reliability of joining parts. Clamps of varying quality and reliability are freely available on the market. The thing is extremely useful.
The fixing substance is applied just before screwing in the bolt. When it dries up, the hardware gets an extra layer of connection. The miracle composition protects bolts and nuts from arbitrary unwinding, primarily due to the effect of vibration on the parts. This is especially true for cars.
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Retainers come in several colors. In the case of factory samples, the color (usually) indicates the strength of the retainer. In most cases, the red remedy is the most powerful and reliable. Used with parts that (most likely) should never be removed at all, even during repairs. The yellow and green clips, in turn, are used with "moving" parts, which can be removed even during routine maintenance of the machine.
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If you want to know even more interesting things,
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A source: https://novate.ru/blogs/310120/53276/