Thread is a fairly effective connection of two parts. But over time, it collapses for various reasons. Under the influence of negative factors, the connections relax. This can lead to serious consequences. Today, a special compound is used to repair such joints. It's a thread restorer. Let's take a look at what it is and how to use it.
Repair Methods
You can restore a stripped thread by drilling a hole to a larger diameter and cutting a new one. This is a fairly efficient method. But not always design features allow you to drill a hole. Among the advantages of this method are the availability and low cost, as well as the absence of the need for any other details. But this will change the size and other characteristics of the thread. Also, by increasing the diameter of the hole, the structure may weaken.
Along with simple reaming, you can install a special threadedsleeve. This technology is used when it is not possible to drill a repair hole. The method is quite simple, but it differs in that the characteristics of the thread do not change in any way. But a hole of a larger diameter cannot always be made, and the repair sleeve must also be securely fixed in the hole.
There is a third, more effective way of repair, which has no significant drawbacks. Here, a thread restorer is used. These are special kits consisting of threaded inserts or metal-filled chemical products. This recovery method is good because you can use it everywhere, even when repairing a car in the field. There are several modern thread repair products available.
Today, the products of brands such as Helicoil and Loctite are especially popular among specialists. There are other manufacturers that make similar thread repair kits. But their efficiency is much lower.
Repair threaded connections with Helicoil kits
You can restore damaged threads using various technologies, most of which require drilling a hole for a larger size. But if the thread of the spark plug hole on the car engine or on the hub for the wheel bolt is torn off, then nothing can be drilled in this case.
What to do about the candle hole? It is possible to increase the outside diameter of the thread and then insert a bushing with both external and internal threads already finished. In the second variantusing a bushing will unbalance the parts that rotate.
Helicoil has developed special repair inserts in a variety of designs and configurations to repair stripped or worn threads as quickly as possible. These sets are widely used in almost all areas, including industrial production. In large factories, these inserts allow you to correct a defective product due to thread defects.
The insert is made of a molded diamond profile. The result is a calibrated thread for double-sided use. Accuracy is 6H class.
Helicoil Benefits
Hellicol Thread Repairer is easy to use. The manufacturer offers a wide range of sizes and diameters. The company produces kits with metric or inch threads. With these kits, holes can be repaired so that their diameter remains the same.
The repair thread is characterized by high wear resistance and mechanical strength. The connection is reliably protected from corrosion, as well as from high-temperature exposure. The fit is very firm and the inserts do not require any additional fixation. Also a significant advantage is the minimum cost of repairs and the ability to restore the connection without the need to remove the part.
Helicoil product types
This thread restorer is a set of taps of the correspondingsize, spindle, drill, breaker of the leash. There are also several threaded inserts in the set. They can be purchased separately if necessary.
With these kits, you can repair metric threads from M2 to M16 with a thread pitch of 1.5, as well as from M18 to M36 with a pitch of 1.5. The kit also includes kits for repairing inch threads of various sizes, from American thread to pipe.
Repair Technology
Let's take a look at how to use thread restorer. The instruction is simple and clear, but still it is necessary to describe the technology in detail. Repair is carried out in several stages. Installing inserts is a simple and cost-effective process. It will take four steps to repair a stripped thread.
Restoring stripped threads
So, first of all, the damaged thread is drilled to a certain diameter. Next, a new one is cut into the hole using a complete tap. Then, an insert is installed in the finished hole using a spindle. Its main working part has a special slot. This is where the drive pin of the repair insert is installed. This insert is screwed into the hole until its very last turn enters ¼ of its step inside. The spindle is then turned out.
Next, the pin is removed. The first turn behind the leash has a mark on which it is broken off. To do this, you need to hit him. If the pin is long,than a bolt, then the leash is not removed.
In this way, you can quickly and efficiently restore any thread. The repair kit from Helicoil can even be used in the field.
Loctite products
This company is also well known for its quality and efficient products. But unlike Helicoil, Loctite thread restorer is a completely chemical substance. Everyone knows thread lockers of this brand.
Anaerobic formulations are available to solve any threading problem. These are one-component liquid materials with varying degrees of viscosity. They are able to remain in their original state for a long time, and also quickly harden in small gaps in the parts to be joined or in the thread. In order for a liquid thread to begin to polymerize, two conditions must be met. So, the presence of metal ions is necessary, as well as minimal contact with air. How to use Loctite thread restorer? It is enough to apply the composition to one of the surfaces to be joined in such an amount that is sufficient to completely fill the repair gaps of the damaged thread.
Cure thread restorer is a hard thermosetting plastic with special properties. So, it steadily withstands any vibrations and shock loads, the connection has good sealing, steadily withstands corrosion and other aggressive influences.
These compositions are produced in the form of a stick, which containsthick paste. It is enough to apply the mixture to the repaired assembly and after polymerization the thread will be restored.
Reviews
Let's see what those who have already tried the thread restorer write. Feedback on these products is positive. With them, you can even perform complex repairs in the field. Also, the thread restored by anaerobic means is very strong and reliable. Buyers note ease of use. The composition effectively restores threaded connections in a short period of time.
