Loctite 271 vs 272

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 over time 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

The properties and performance of Loctite 271 and 272, despite the fact that they are both parts of the same series, are vastly different.

Fastener Size

Fastener size is undoubtedly the most significant feature in our comparison. Threadlockers are required for a wide range of fasteners, including screws and bolts. The viscosity and strength of a threadlocker are inversely related to the size of the fastener for which they are used. The larger the size of the fastener, the better the adhesion between the two parts.

On the other hand, Loctite 271 is suitable for any screw with a diameter ranging from 3/8″ to 1″. Loctite 272, on the other hand, has a higher viscosity than the previous ones, allowing it to be used with fasteners ranging from 3/4-inch to 1.5-inch diameter, which is a significant difference when compared to other high-strength threadlockers.

Maximum Heat Stability

All threadlockers on the market, including Loctite 272, have the highest thermal stability of them all, with a maximum thermal stability of 450 degrees Fahrenheit.

Loctite 271 has a lower overall thermal stability than Loctite 272, which is a disadvantage. It is capable of withstanding temperatures up to 300 degrees Fahrenheit at its peak. A consequence of this is that it becomes ineffective when exposed to high temperatures, making it unsuitable for use in high-temperature environments.

Fixture Time

Due to its lower viscosity and smaller bond size, Loctite 271 has a shorter bonding time than other adhesives. In other words, it takes only 15 to 20 minutes to fully resolve. As a result, after you’ve tuned up your vehicle’s bolts and screws, you won’t have to wait long. However, Loctite 272 requires a much longer cure time, ranging from 50 minutes to a full hour, to fully cure.

Application Purpose

The main reason for their disparate characteristics and requirements is that they are used for a variety of diverse applications. Loctite 271 is a versatile adhesive that can be used for a variety of tasks, including the installation of shock absorber mounts, press fittings, and wheel bolts, among others. In addition, Loctite 272 can be used for a variety of tasks, such as tightening crankshaft bolts, sprockets, shock absorber bolts, idler wheel bearings, and other similar pieces of equipment. Therefore, when selecting a threadlocker, consider both its functionality and the purpose for which it is to be used.

How To Remove Loctite

Loctite is a registered trademark of adhesives and threadlockers used to secure bolts and screws in their respective positions. They prevent joints from shaking and loosening during strenuous exercise or while under pressure. Due to the nature of the glue, removing Loctite brand adhesives can be very difficult if the correct removal methods are not followed.

  1. Using the towel, wipe any dust or dirt from the nut, bolt, or screw you wish to unscrew or remove. This is essential to avoid fire hazards.
  2. Keep a distance of about 5 cm between the heat gun and the Loctite bonded object.
  3. With the heat gun, apply heat to the area. It is best to heat the surface quickly and then move on to the next tool.
  4. To remove the component, use the socket wrench set or a screwdriver for leverage. Heating the Loctite adhesives causes them to break, allowing you to remove the screw or nut with standard hand tools.

Final Thoughts – Loctite 271 vs 272

271 and 272 are two of the strongest threadlockers available on the market and are the best choices for heavy-duty automotive applications.

In terms of thermal stability and fastener sizes that can be accommodated, Loctite 272 is an excellent product. This indicates that it is the strongest glue available on the market.

With this comparison of Loctite 271 vs 272 lubricants, you will be able to recognize the significant differences between the two products. In this way, you will be able to compare and choose the best lubricant for your threadlocker.


Hi, I'm the initiator and writer of this blog. Cars were and will be my first love, and my favorite hobby, that's why I decided to start this blog and write about my discoveries and techniques to improve my cars or repair them.