Thread lock
Content
Thread lock helps to increase the clamping force between the twisted threaded connections, that is, to prevent spontaneous unwinding, and also to protect the connecting parts from rust and sticking.
Three basic types of retainers are available - red, blue and green. Reds are traditionally considered the strongest, and greens the weakest. However, when choosing one or another fixative, you need to pay attention not only to the color, but also to the performance characteristics given on their packaging.
The strength of the fixation may depend not only on the color, but also on the manufacturer. Therefore, the end user has a reasonable question - which thread lock to choose? And in order to help you make the right choice, here is a list of popular remedies, which was compiled on the basis of reviews, tests and studies found on the Internet. As well as a description of the characteristics, composition and principle of selection.
Why use thread lockers
Thread lockers have found widespread use not only in the automotive industry, but also in other areas of production. These tools have replaced the "grandfather" methods of fixing threaded connections, such as a grover, a polymer insert, a folding washer, a lock nut and other delights.
The reason for using these technological tools is that in modern cars, threaded connections with a fixed (optimal) tightening torque, as well as bolts with an increased bearing surface, are increasingly used. Therefore, it is important to maintain the downforce value throughout the lifetime of the assembly.
So, thread lockers are used when fastening brake calipers, camshaft pulleys, in the design and fastening of a gearbox, in steering controls, and so on. Clamps are used not only in machine technology, but also when performing other repair work. For example, when repairing household appliances, bicycles, gas and electric saws, braids and other equipment.
Anaerobic thread lockers perform not only their direct function of fixing the connection of two parts, but also protect their surfaces from oxidation (rust), and also seal them. Therefore, thread lockers should also be used to adequately protect parts in those places where there is a high probability of moisture and / or dirt getting into the threads.
Types of thread retainers
Despite all the variety of thread lockers, they can all be divided into three broad categories - red, blue and green. Such a division by color is very arbitrary, yet it gives a basic understanding of how high-strength or, conversely, weak sealant is offered.
Red clips are traditionally considered the most “strong”, and are positioned by manufacturers as high-strength. Most of them are heat-resistant, that is, those that can be used in mechanisms, including machines, operating at temperatures above +100°C (usually up to +300°C). The definition of "one-piece", often applied specifically to red thread locks, is rather a marketing ploy. Real tests show that threaded connections, processed even by the most “durable” means, are quite amenable to dismantling with locksmith tools.
Blue clips threads are usually positioned by manufacturers as "split". That is, their strength is somewhat less than that of the red ones (medium strength).
Green retainers - the weakest. They, too, can be described as "dismantled". They are usually used for processing threaded connections with small diameters, and twisted with little torque.
The following categories into which threaded fasteners are divided − Operating temperature range. usually, ordinary and high-temperature agents are isolated. As their names imply, retainers can be used to fasten a threaded connection that operates at various temperatures.
also threaded locks are divided according to their state of aggregation. namely, on sale there are liquid and pasty funds. Liquid fixatives are usually used for small threaded connections. And the larger the threaded connection, the thicker the product should be. namely, for large threaded connections, fixatives in the form of a thick paste are used.
Most threadlockers are anaerobic. This means that they are stored in a tube (vessel) in the presence of air, and under such conditions do not enter into a chemical reaction and do not manifest themselves in any way. However, after they are applied to the surface to be treated, under conditions where air access to them is limited (when the thread is tightened), they polymerize (that is, harden) and perform their direct function, which consists in reliable fixation of two contacting surfaces. It is for this reason that most stopper tubes feel soft to the touch and appear to be more than half full of air.
The composition of the thread lock
Most anaerobic dismantled (detachable) thread lockers are based on polyglycol methacrylate, as well as modifying additives. More complex (one-piece) tools have a more complex composition. For example, the red Abro fixative has the following composition: acrylic acid, alpha dimethylbenzyl hydroperoxide, bisphenol A ethoxyl dimethacrylate, ester dimethacrylate, 2-hydroxypropyl methacrylate.
However, color grading is only a rough approximation across product categories, and there are always two factors to consider when choosing a fixative. The first is the performance characteristics of the selected latch. The second is the size of the machined parts (threaded connection), as well as the material from which they are created.
How to choose the best thread locker
In addition to color, there are a number of criteria that you should definitely pay attention to when choosing one or another thread locker. they are listed below in order.
Fixed moment of resistance
Torque value reported as "one-piece". Unfortunately, most manufacturers do not specify this specific value. Others indicate the moment of resistance with specific values. However, the problem here is that the manufacturer does not say what size threaded connection this resistance is calculated for.
Obviously, to unscrew a small bolt, less torque is needed than to unscrew a bolt with a large diameter. There is an opinion among motorists that “you can’t spoil porridge with oil”, that is, the stronger the fixative you use, the better. However, it is not! If you use a very strong lock on a small finely threaded bolt, it can be permanently screwed in, which is undesirable in most cases. At the same time, a similar compound will be the less effective the larger the thread (both diameter and length) it is used.
Interestingly, different manufacturers indicate the viscosity of their product in different units of measurement. namely, some indicate this value in centiPoise, [cPz] - a unit of dynamic viscosity in the CGS system of units (usually overseas manufacturers do this). Other companies indicate a similar value in milliPascal seconds [mPas] - a unit of dynamic oil viscosity in the international SI system. remember that 1 cps is equal to 1 mPa s.
State of aggregation
As mentioned above, thread lockers are usually sold as a liquid and paste. Liquid products are conveniently poured into closed threaded connections. also, liquid fixatives spread more fully over the treated surfaces. However, one of the disadvantages of such funds is their widespread spreading, which is not always convenient. Pastes do not spread, but it is not always convenient to apply them to the surface. Depending on the packaging, this can be done precisely from the neck of the tube or using additional tools (screwdriver, finger).
However, the aggregate state of the agent must also be selected in accordance with the size of the thread. namely, the smaller the thread, the more fluid the fixative should be. This is due to the fact that otherwise it will drain to the edge of the thread, and will also be squeezed out of the inter-thread gaps. For example, for threads with sizes from M1 to M6, the so-called "molecular" composition is used (viscosity value is about 10 ... 20 mPas). And the larger the thread becomes, the more pasty the fixative should be. Likewise, the viscosity should increase.
Process fluid resistance
namely, we are talking about various lubricating fluids, as well as fuel (gasoline, diesel fuel). Most thread lockers are completely neutral to these agents, and can be used to fix threaded connections of parts operating in oil baths or in conditions of fuel vapors. However, this point needs to be clarified additionally, in the documentation, in order not to encounter an unpleasant surprise in the future.
Curing time
One of the disadvantages of thread lockers is that they do not show their properties immediately, but after a certain amount of time. Accordingly, the bonded mechanism is undesirable for use under full load. The polymerization time depends on the type of particular agent. If the repair is not urgent, then this parameter is not critical. Otherwise, you should pay attention to this factor.
Value for money, reviews
this parameter must be selected, like any other product. There are many different types of products on the market. In general terms, it is best to buy a retainer from the middle or higher price range. Frankly cheap means will most likely be ineffective. Of course, in this case, you need to pay attention to the volume of packaging, conditions of use, and so on.
Rating of the best thread lockers
in order to answer the question of which thread lock is better, the editors of our resource compiled a non-advertising rating of these funds. the list is based only on reviews found on the Internet by various motorists who at different times used certain means, as well as on the material of the authoritative publication "Behind the Rulem", whose specialists conducted relevant tests and studies of a number of domestic and foreign thread lockers.
I'M G
Threadlocker IMG MG-414 High Strength according to the tests conducted by the specialists of the auto magazine is the leader of the rating, because it showed the best results during the tests. The tool is positioned as a heavy-duty threadlocker, one-component, thixotropic, red in color with an anaerobic polymerization (hardening) mechanism. The tool can be successfully used instead of traditional spring washers, retaining rings and other similar devices. Increases the strength of the entire connection. Prevents oxidation (rusting) of the thread. Resistant to strong vibration, shock and thermal expansion. Resistant to all process fluids. It can be used in any machine mechanisms with a thread diameter from 9 to 25 mm. Operating temperature range — from -54°С to +150°С.
Sold in a small package of 6 ml. The article of one such tube is MG414. Its price as of spring 2019 is about 200 rubles.
Permatex High Temperature Threadlocker
The Permatex threadlocker (English designation - High Temperature Threadlocker RED) is positioned as high-temperature, and is able to work in conditions up to + 232 ° C (lower threshold - -54 ° C). Designed for use in threaded connections from 10 to 38 mm (3/8 to 1,5 in.).
Withstands increased vibrations as well as extreme mechanical loads. Prevents the appearance of corrosion on the thread, does not crack, does not drain, does not require subsequent tightening. Full strength occurs after 24 hours. To dismantle the composition, the unit must be heated to a temperature of + 260 ° C. The test confirmed the high efficiency of this thread locker.
It is sold in packages of three types - 6 ml, 10 ml and 36 ml. Their articles are 24026; 27200; 27240. And, accordingly, the prices are 300 rubles, 470 rubles, 1300 rubles.
Loctite
The world-famous German adhesive manufacturer Henkel also launched a line of adhesives and sealants under the brand name Loctite in 1997. Currently, there are 21 types of threaded fasteners on the market, produced under the mentioned trademark. All of them are based on dimethacrylate ester (methacrylate is simply indicated in the documentation). A distinctive feature of all fixatives is their glow in ultraviolet rays. This is necessary to check their presence in the connection, or absence over time. Their other characteristics are different, so we list them in order.
Loctite 222
Low strength threadlocker. Suitable for all metal parts, but most effective for low strength metals (such as aluminum or brass). Recommended for use with countersunk head bolts where there is a risk of thread stripping when loosening. Mixing with a small amount of process liquids (namely, oils) is allowed. However, it begins to lose its properties after approximately 100 hours of operation in such an environment.
The state of aggregation is a purple liquid. The maximum thread size is M36. Permissible operating temperature is from -55°C to +150°C. Strength is low. Loosening torque - 6 N∙m. Viscosity - 900 ... 1500 mPa s. Time for manual processing (strength): steel - 15 minutes, brass - 8 minutes, stainless steel - 360 minutes. Complete polymerization occurs after one week at a temperature of +22°C. If disassembly is required, the machined assembly must be locally heated to a temperature of +250°C, and then disassembled in a heated state.
The goods are sold in packages of the following volumes: 10 ml, 50 ml, 250 ml. The article of the 50 ml package is 245635. Its price as of the spring of 2019 is about 2400 rubles.
Loctite 242
Universal threadlocker of medium strength and medium viscosity. It is a blue liquid. The maximum size of the threaded connection is M36. Operating temperature range is from -55°С to +150°С. Loosening torque - 11,5 N∙m for M10 thread. It has thixotropic properties (has the ability to reduce viscosity, that is, to liquefy under mechanical action and thicken at rest). Resistant to various process fluids, including oil, gasoline, brake fluid.
Viscosity is 800…1600 mPa∙s. Time to work with manual strength for steel is 5 minutes, for brass is 15 minutes, for stainless steel is 20 minutes. The manufacturer directly indicates that in order to dismantle the latch, the unit treated by him must be locally heated to a temperature of +250°C. You can remove the product with a special cleaner (the manufacturer advertises a cleaner of the same brand).
Sold in packages of 10 ml, 50 ml and 250 ml. The price of the smallest package as of the spring of 2019 is about 500 rubles, and the cost of a 50 ml tube is about 2000 rubles.
Loctite 243
The Loctite 243 retainer is the most popular in the range, as it has one of the highest loosening torques and higher operating temperatures. At the same time, it is positioned as a thread locker of medium strength, representing a blue liquid. The maximum thread size is M36. The operating temperature range is from -55°C to +180°C. The loosening torque is 26 N∙m for the M10 bolt. Viscosity - 1300–3000 mPa s. Time for manual strength: for ordinary and stainless steel - 10 minutes, for brass - 5 minutes. For dismantling, the assembly must be heated to +250°C.
Sold in packages of the following volumes: 10 ml, 50 ml, 250 ml. The article of the smallest package is 1370555. Its price is about 330 rubles.
Loctite 245
Loctite 245 is marketed as a medium strength non-drip threadlocker. Can be used for threaded connections requiring easy disassembly with hand tools. The state of aggregation is a blue liquid. The maximum thread is M80. The operating temperature range is from -55°C to +150°C. Loosening torque after shearing for thread M10 - 13 ... 33 Nm. The breakaway moment when using this clamp will be approximately equal to the tightening torque (10 ... 20% less without using it). Viscosity - 5600–10 mPa s. Hand strength time: steel - 000 minutes, brass - 20 minutes, stainless steel - 12 minutes.
It is sold in packages of the following volumes: 50 ml and 250 ml. The price of a smaller package is about 2200 rubles.
Loctite 248
Loctite 248 threadlocker is medium strength and can be used on all metal surfaces. A distinctive feature is its state of aggregation and packaging. So, it is non-liquid and easy to apply. Packed in a pencil box. The maximum thread size is M50. Loosening torque - 17 Nm. The operating temperature range is from -55°C to +150°C. On steel, before solidification, you can work up to 5 minutes, on stainless steel - 20 minutes. For dismantling, the assembly must be heated to +250°C. Upon contact with process fluids, it may initially lose its properties by about 10%, but then it maintains this level on a permanent basis.
It is sold in a 19 ml pencil box. The average price of such a package is about 1300 rubles. You can buy it under the article - 1714937.
Loctite 262
Loctite 262 is marketed as a thixotropic threadlocker that can be used in threaded connections that do not require periodic disassembly. It has one of the largest fixing moments. Aggregate state - red liquid. Strength - medium / high. The maximum thread size is M36. Operating temperature - from -55°C to +150°C. Loosening torque - 22 Nm. Viscosity - 1200–2400 mPa s. Time for manual strength: steel - 15 minutes, brass - 8 minutes, stainless steel - 180 minutes. For dismantling, it is necessary to heat the unit up to +250°C.
It is sold in various packages: 10 ml, 50 ml, 250 ml. The article of a 50 ml bottle is 135576. The price of one package is 3700 rubles.
Loctite 268
Loctite 268 is a non-liquid high strength threadlocker. It is distinguished by packaging - a pencil. Can be used on all metal surfaces. The state of aggregation is a waxy consistency of red color. The maximum thread size is M50. Operating temperature - from -55°C to +150°C. Durability is high. Loosening torque - 17 Nm. Does not have thixotropic properties. The time for manual processing on steel and stainless steel is 5 minutes. Please note that Loctite 268 threadlocker quickly loses its properties when working in hot oil! For dismantling, the assembly can be heated up to +250°C.
The fixative is sold in packs of two volumes - 9 ml and 19 ml. The article of the most popular large package is 1709314. Its approximate price is about 1200 rubles.
Loctite 270
Loctite 270 threadlocker is designed for fixing and sealing threaded connections that do not require periodic disassembly. Provides long lasting hold. Suitable for all metal parts. The aggregate state is a green liquid. The maximum thread size is M20. It has an extended temperature range - from -55°C to +180°C. Durability is high. Loosening torque - 33 Nm. No thixotropic properties. Viscosity - 400–600 mPa s. Time for manual processing: for ordinary steel and brass - 10 minutes, for stainless steel - 150 minutes.
Sold in three different packages - 10 ml, 50 ml and 250 ml. The article of the package with a volume of 50 ml is 1335896. Its price is about 1500 rubles.
Loctite 276
Loctite 276 is a threadlocker designed for nickel-plated surfaces. It has very high strength and low viscosity. Designed for threaded connections that do not require periodic disassembly. The aggregate state is a green liquid. Durability is very high. Loosening torque - 60 Nm. The maximum thread size is M20. Operating temperature - from -55°C to +150°C. Viscosity - 380 ... 620 mPa s. Slightly loses its properties when working with process fluids.
It is sold in two types of packages - 50 ml and 250 ml. The price of the most popular small package is about 2900 rubles.
Loctite 2701
Loctite 2701 threadlocker is a high strength, low viscosity threadlocker for use on chrome parts. Used for non-separable connections. It can be used for parts subject to significant vibration during operation. The aggregate state is a green liquid. The maximum thread size is M20. Operating temperature - from -55°C to +150°C, however, after a temperature of +30°C and above, the properties are significantly reduced. Strength is high. The loosening torque for the M10 thread is 38 Nm. No thixotropic properties. Viscosity - 500 ... 900 mPa s. Manual processing time (strength) for materials: steel - 10 minutes, brass - 4 minutes, stainless steel - 25 minutes. Resistant to process fluids.
It is sold in three types of packages - 50 ml, 250 ml and 1 liter. The article of the bottle is 50 ml, its article is 1516481. The price is about 2700 rubles.
Loctite 2422
Loctite 2422 Threadlocker provides medium strength for metal threaded surfaces. It differs in that it is sold in a pencil package. Aggregate state - blue paste. The second difference is the ability to work at high temperatures, namely up to +350°C. Unscrewing torque - 12 Nm. Works great with hot engine oil, ATF (automatic transmission fluid), brake fluid, glycol, isopropanol. When interacting with them, it increases its characteristics. Reduces them only when interacting with gasoline (unleaded).
It is sold in a 30 ml pencil box. The price of one package is about 2300 rubles.
Abro thread lock
Several thread lockers are produced under the Abro trademark, however, tests and reviews have shown that Abrolok Threadlok TL-371R shows the greatest efficiency. It is positioned by the manufacturer as a non-removable threadlocker. The tool belongs to the "red", that is, non-separable, clamps. Used for connections that do not require frequent disassembly. Provides sealing to the threaded connection, resistant to vibration, neutral to process fluids. Can be used for threads up to 25mm. Hardening occurs 20-30 minutes after application, and complete polymerization occurs in a day. Temperature range - from -59°C to +149°C.
It can be used in a variety of machine assemblies - assembly studs, gearbox elements, suspension bolts, fasteners for engine parts, and so on. When working, care must be taken to avoid contact with eyes, skin and respiratory organs. Work in a ventilated room or outdoors. Tests show the average effectiveness of Abrolok Threadlok TL-371R thread locker, however, it may well be used in non-critical vehicle components.
Sold in a 6 ml tube. The article of such packaging is TL371R. Accordingly, its price is 150 rubles.
DoneDeaL DD 6670
Similarly, several threadlockers are sold under the DoneDeaL trademark, but one of the most popular and effective is the DoneDeaL DD6670 anaerobic split threadlocker. It belongs to the "blue" clamps, and provides a connection of medium strength. The thread can be unscrewed with a hand tool. The tool can withstand even significant mechanical loads and vibrations, protects the treated surfaces from moisture and the result of its impact - corrosion. Recommended for use on threaded connections with a diameter of 5 to 25 mm. In machine engineering, it can be used to fix rocker pin bolts, adjusting bolts, valve cover bolts, oil pan, fixed brake calipers, intake system parts, alternator, pulley seats and so on.
In operation, they showed the average efficiency of the latch, however, given its average characteristics declared by the manufacturer, it does its job well. Therefore, it is recommended for use in non-critical elements of the car. The DonDil thread lock is sold in a small 3 ml bottle. Its article number is DD6670. And the price of such a package is about 250 rubles.
Mannol Fix thread medium strength
The manufacturer of Mannol Fix-Gewinde Mittelfest directly on the package indicates that this thread locker is designed to prevent metal threaded connections with a thread pitch up to M36 from unwinding. Refers to dismantled clamps. At the same time, it can be used on parts operated under vibration conditions, namely, it can be used in engine engine components, transmission systems, gearboxes.
The mechanism of its work is such that it fills the inner surface of the threaded connection, thereby protecting it. This prevents leakage of water, oil, air, as well as the formation of corrosion centers on metal surfaces. The value of the maximum torque for a thread with a pitch of M10 is 20 Nm. Operating temperature range — from -55°С to +150°С. Primary fixation occurs within 10-20 minutes, and complete solidification is ensured after one to three hours. However, it is better to wait more time in order to allow the fixative to harden well.
Please note that the packaging indicates that you need to work with the product on the street or in a well-ventilated area. Avoid contact with eyes and open areas of the body! That is, you need to work in protective gloves. Sold in a 10 ml bottle. The article of one such package is 2411. The price as of spring 2019 is about 130 rubles.
Detachable retainer Lavr
Of those manufactured under the Lavr trademark, it is the detachable (blue / light blue) thread lock sold with the article LN1733 that is the most effective. It can be used for threaded connections that require periodic assembly / disassembly (for example, when servicing a car).
Characteristics are traditional. Unscrewing torque - 17 Nm. The operating temperature range is from -60°С to +150°С. Initial polymerization is provided in 20 minutes, full - in a day. Protects treated surfaces from corrosion, resistant to vibration.
Tests of the Lavr thread lock show that it is quite good, and withstands medium forces, ensuring reliable fastening of the threaded connection. Therefore, it may well be recommended to both ordinary car owners and craftsmen who perform repair work on an ongoing basis.
Sold in a 9 ml tube. The article of such packaging is LN1733. Its price as of the above period is about 140 rubles.
How to replace the thread lock
Many drivers (or just home craftsmen) use other tools instead of thread lockers that have similar properties. For example, in ancient times, when thread locks were not invented either, drivers and car mechanics everywhere used red lead or nitrolac. These compositions are similar to dismantled thread locks. In modern conditions, you can also use the tool known as "Super Glue" (it is produced by various companies, and may differ in name).
also a few improvised analogues of clamps:
- nail polish;
- bakelite varnish;
- varnish-zapon;
- nitro enamel;
- silicone sealant.
However, it must be understood that the compositions listed above, firstly, will not provide proper mechanical strength, secondly, they will not be so durable, and thirdly, they will not withstand the significant operating temperature of the assembly. Accordingly, they can only be used in extreme "marching" cases.
With regard to particularly strong (one-piece) connections, epoxy resin can be used as an alternative to thread lock. It is inexpensive and very effective. It can be used not only for threaded connections, but also for other surfaces that need to be fastened “tightly”.
How to unscrew the thread lock
Many car enthusiasts who have already used one or another thread lock are often interested in the question of how to dissolve it in order to unwind the threaded connection again. The answer to this question depends on what type of fixator was used. However, the universal answer in this case is thermal heating (of varying degrees for certain types).
For example, for the most resistant, red, thread lockers, the corresponding temperature value will be approximately +200°C ... +250°C. As for the blue (removable) clamps, the same temperature will be about +100°C. As tests show, at this temperature, most retainers lose up to half of their mechanical abilities, so the thread can be unscrewed without problems. Green fixatives lose their properties at lower temperatures as well. To heat the threaded connection, you can use a building hair dryer, fire or an electric soldering iron.
Please note that the use of traditional "soaking" agents (like WD-40 and its analogues) in this case will be ineffective. This is due to the polymerization of the fixative in its working state. Instead, special cleaners-removers of thread retainer residues are on sale.
Hack and predictor Aviator
A thread lock is a very useful tool among the technological compositions in the asset of any car enthusiast or craftsman involved in repair work. Moreover, not only in the field of machine transport. it is necessary to make a choice of one or another latch according to its operational characteristics. namely, resistance to torque, density, composition, state of aggregation. You should not buy the strongest fixative, with a "margin". For small threaded connections, this can be detrimental. Did you use any threadlockers? Tell us about it in the comments.
