Loctite 271 vs 272: Which Lube Is Right For Your Threadlocker?

The threadlocker is an optimal solution for securing bolted joints. Bolted or removable joints are a universally used fastening system for an infinite number of assemblies, both in the industrial sector in general and in the automotive sector in particular. A bolted joint is made up of two basic elements, a bolt or stud, and a nut or threaded hole, which is joined together thanks to the specific carving performed on them.

Bolted joints are present in countless objects, machines, and vehicles. This type of joint has a number of disadvantages that cause the fastening to fail over time. when subjected to stress, vibrations, impacts, loads, and/or thermal expansion. These factors cause loss of clamping force and self-loosening, which can seriously compromise the assembly in question. Therefore, to avoid this serious drawback, it is essential to use a fastener fixative such as LOCTITE 271 or LOCTITE 272 as a sealing element for the assembly.

What Is Threadlocker?

Bolted joints are a widely used joining system in vehicle assembly, especially in the fastening of mechanical elements and articulated bodywork components. A bolted joint has as main elements two threaded parts (one with male thread and the other with female thread). However, the threaded joint can only maintain its fixation overtime when auxiliary elements such as a washer and/or a threadlocker are inserted.

A threadlocker is required to ensure the durability of the joints for as long as possible and to offer high thermal and mechanical resistance. But beyond that, today’s society demands products that are increasingly respectful of the environment and people’s health. That is why some manufacturers market products, such as LOCTITE 271 and LOCTITE 272, which, in addition to guaranteeing the durability and effectiveness of the joints, stand out for being free of substances that are harmful to health in their composition.

These products are usually classified according to their resistance (low, medium, or high, depending on the force required for disassembly) or their viscosity, and are particularly effective in preventing relaxation and self-loosening of threads.

Liquid threadlockers, such as LOCTITE 271 and LOCTITE 272, increase the strength and durability of the joints and reproduce the factory fastening. In addition, if there is one thing that makes these two products stand out, it is that they are completely safe for the operator. Proof of this is that they do not include any type of danger symbol or warning or safety instructions. These two fasteners are free of toxic products, environmentally friendly and their use does not pose any health risk.

Loctite 271 vs 272: Comparison

Although both are part of the same sequence, Loctite 271 and 272 have different characteristics and performances. To differentiate one from the other, they have different application purposes, fastener sizes, maximum temperatures and even fastening times. Let’s cut to the chase and look at their differences.

Fastener Size

The size of the fasteners is undoubtedly the most important feature in our comparison. Threadlockers are required for various types of fasteners. The viscosity and strength of a threadlocker are proportional to the size of the fastener. The larger the fastener size, the better the adhesive.

However, Loctite 271 is suitable for any fastener with a diameter of 3/8 to 1 inch. The viscosity is significantly lower than traditional high-strength threadlockers, allowing for easier removal.

Loctite 272, on the other hand, has a higher viscosity than the above, allowing for fastener sizes ranging from 3/4 to 1.5 inches, which is very noticeable when compared to other high-strength threadlockers. Since most threadlockers in this category only have a 1-in. fastener size, half an inch more is a big deal for a high-strength threadlocker.

The different sizes of fasteners allow them to be used for a variety of purposes. In terms of holding power, both perform admirably.

Maximum Heat Stability

Loctite 272 has the highest thermal stability of any threadlocker on the market, with the maximum thermal stability of 450 degrees Fahrenheit. The most heat-stable threadlocker we experienced was Loctite 2620, which is a beast with the maximum thermal stability of 650 degrees Fahrenheit. However, this threadlocker is hard to come by, so look for Loctite 272.

The overall thermal stability of Loctite 271 is lower than that of Loctite 272. At its highest point, it can withstand temperatures up to 300 degrees Fahrenheit. As a result, it becomes ineffective at high temperatures, making it unsuitable for high-temperature conditions. However, having a lower heat tolerance allows it to be removed quickly and easily.

Fixture Time

Loctite 271 sets in 10-20 minutes due to its lower viscosity and smaller bolt size. After you have tuned your vehicle’s screws and bolts, you won’t have to wait all day. Loctite 272, on the other hand, takes 40 minutes to an hour to fully set.

Application Purpose

The main explanation for their different characteristics and specifications is that they are used for different purposes. Loctite 271 is ideal for a range of activities, such as the installation of shock absorber mounts, press fits, and wheel bolts, among others. And Loctite 272 can be used for a number of items, such as tightening crankshaft bolts, sprockets, shock absorber bolts, idler wheel bearings, etc. Therefore, you should choose a threadlocker based on both its functionality and its intended use.

How To Remove Loctite Red Threadlockers

They are difficult to remove as both are high-strength threadlockers. You have to know the characteristics of the fixative that has been used to remove the adhesive from any thread. And this is where the role of temperature comes into play.

Simply direct heat or sweat to the region where the threadlocker is to be removed. Vaporization of the joints can be very useful. In fact, it weakens the adhesive, allowing the threadlocker to come off. This is how it is done.


This concludes our comprehensive comparison of Loctite 271 vs. 272. Consider your wishes and your comfort when making your decision. Both are of excellent quality and will serve whatever purpose you need them for. Good luck with your gear change!