Loctite 266 Vs 272 – Key Differences, Strength & Load-bearing Capacity

Loctite 266 and 272 are two different adhesive products with unique characteristics. Loctite 266 is a high-strength red threadlocker, while Loctite 272 is a high-temperature and high-strength red threadlocker.

When it comes to choosing the right adhesive for your needs, it is crucial to consider factors such as temperature resistance and strength requirements.

Loctite 266 is ideal for applications that require high-strength bonding in a wide range of temperatures, while Loctite 272 is specifically designed to withstand high-temperature environments.

Both products offer excellent durability and reliability, ensuring secure and long-lasting bonds. Understanding the specific requirements of your project will help you determine whether Loctite 266 or 272 is the right choice for you.

Loctite 266 Vs Loctite 272



Understanding the composition of Loctite 266 and 272 is essential to grasp their individual characteristics and applications.

Chemical Makeup Of Loctite 266

Loctite 266 is primarily composed of anaerobic acrylic adhesives, which are designed to cure in the absence of air and when in contact with metal substrates.

These adhesives contain methacrylate components that contribute to their superior bonding strength.

Chemical Makeup Of Loctite 272

On the other hand, Loctite 272 contains a high viscosity and anaerobic formula that provides a strong bond between cylindrical fitting parts.

Its chemical composition includes methacrylate esters and a modified acrylic dimethacrylate for enhanced performance in high-temperature environments.

Loctite 266 Vs 272


Key Differences

When comparing Loctite 266 vs. Loctite 272, understanding the key differences is crucial for choosing the right adhesive for your needs. Let’s delve into the distinguishing features under various aspects:

Strength And Load-bearing Capacity

Loctite 266 offers high shear strength, making it ideal for heavy-duty applications. In contrast, Loctite 272 is known for its exceptional tensile strength, which is crucial for applications requiring maximum load-bearing capacity.

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Temperature Resistance

Both Loctite 266 and Loctite 272 exhibit excellent heat resistance, capable of withstanding extreme temperatures without losing adhesive properties.

Curing Speed

While Loctite 266 cures relatively quickly, Loctite 272 provides a slower curing time, allowing for ideal positioning of components before bonding.

Common Applications

Loctite 266 and Loctite 272 are two popular threadlocking adhesives used in various applications. Let’s explore where these adhesives are commonly used:

Where To Use Loctite 266?

Loctite 266 is a red, high-strength threadlocker designed to lock and seal threaded fasteners. It is commonly used in the following applications:

  • Automotive repair: Loctite 266 is ideal for securing bolts, nuts, and studs in automotive engines, transmissions, and other critical components.
  • Heavy machinery: This threadlocker is suitable for preventing loosening and leakage in heavy machinery, such as construction equipment, agricultural machinery, and industrial plants.
  • Marine equipment: Due to its resistance to vibration and harsh environmental conditions, Loctite 266 is often used in marine applications, including securing bolts and screws on boats, ships, and offshore platforms.
  • Industrial maintenance: Whether it’s securing bolts on pumps, turbines, or generators or ensuring tightness in hydraulic systems, Loctite 266 provides reliable threadlocking.

Loctite 266 is specifically designed for applications where high strength and resistance to severe conditions are required. Its ability to withstand vibrations and high temperatures makes it a go-to choice in demanding environments.

Where To Use Loctite 272?

Loctite 272 is a red, high-strength, high-temperature threadlocker that provides exceptional performance in demanding applications. The common uses for Loctite 272 include:

  • Aerospace: This threadlocker is frequently employed in aerospace applications, such as aircraft engines, control systems, and landing gear assemblies, where high temperature and vibration resistance are vital.
  • Machinery and equipment: Loctite 272 is an excellent choice for locking and sealing fasteners in heavy machinery and equipment that operates under extreme conditions, such as mining equipment, power plants, and oil rigs.
  • Manufacturing and assembly: For applications where high-strength threadlocking is necessary, Loctite 272 is often used, including the assembly of engines, turbines, hydraulic systems, and complex machinery.
  • Chemical processing: Due to its resistance to aggressive chemicals and elevated temperatures, Loctite 272 finds use in various chemical processing plants, refineries, and petrochemical facilities.

Loctite 272 is designed to provide reliable performance in environments with extreme conditions, ensuring that threaded connections remain secure, without compromising their integrity.

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Loctite 266 Vs 272

Usage Tips

When it comes to adhesive solutions, Loctite 266 and Loctite 272 are two popular options known for their exceptional performance. Both adhesives offer high strength and reliability, but it’s important to use them correctly to get the best results.

Best Practices For Applying Loctite 266

  1. Preparation is key: Before applying Loctite 266, make sure the surfaces to be bonded are clean, dry, and free from oil, grease, and other contaminants. This will ensure a strong and durable bond.
  2. Apply sparingly: Loctite 266 is a high-strength adhesive, so it’s important to use it sparingly. Apply a thin and uniform layer to one of the surfaces being bonded. Remember, a little goes a long way.
  3. Allow for curing time: Once applied, Loctite 266 requires curing time to reach its maximum strength. It is recommended to wait at least 24 hours before subjecting the bond to full load or stress. Patience is key to achieving the best results!
  4. Store properly: After use, ensure that the container is tightly sealed to prevent the adhesive from drying out. Store Loctite 266 in a cool, dry place away from direct sunlight and extreme temperatures.

Best Practices For Applying Loctite 272

  1. Prepare the surfaces: Before applying Loctite 272, clean the surfaces to be bonded thoroughly with a suitable cleaner. Remove all dirt, grease, and oil for optimal adhesion.
  2. Apply in moderation: Loctite 272 is a high-strength adhesive, so it’s important not to overdo it. Apply a small, uniform amount to one of the surfaces, leaving room for the adhesive to spread during assembly.
  3. Allow for curing time: To maximize the strength of the bond, allow Loctite 272 to cure for at least 24 hours before subjecting it to load or stress. This ensures a secure and long-lasting bond.
  4. Proper storage: To maintain the quality of Loctite 272, always seal the container tightly after each use. Store the adhesive in a cool and dry place to avoid exposure to excessive heat or humidity.

Comparative Analysis

When comparing Loctite 266 and Loctite 272, it’s important to understand the differences between these two popular adhesives. Let’s delve deeper into a comparative analysis to help you choose the right one for your needs.

Pros And Cons Of Loctite 266

  • Pros: Excellent chemical resistance.
  • Cons: Longer cure time.

Pros And Cons Of Loctite 272

  • Pros: Quick curing time.
  • Cons: Lower chemical resistance.
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Customer Reviews


Reading customer reviews can be a valuable way to gain insights into the performance and efficacy of products like Loctite 266 and 272. Let’s look at some firsthand experiences shared by users who have utilized these adhesives in various applications.

Experiences With Loctite 266

Users of Loctite 266 have reported strong adhesion and reliable sealing in challenging environments.

Many customers have praised its resistance to vibration and thermal cycling, making it a preferred choice for securing threaded assemblies. One reviewer stated that the adhesive significantly improved the durability of their machinery.

Experiences With Loctite 272

Conversely, customers using Loctite 272 have highlighted its exceptional bond strength and ability to withstand extreme conditions.

Some users have specifically mentioned its suitability for high-temperature applications, indicating that it effectively maintains integrity under intense heat.

Frequently Asked Questions For Loctite 266 Vs 272

What Is Loctite 266 Used For?

Loctite 266 is used for high-strength threadlocking and sealing of threaded fasteners like studs and bolts.

It prevents loosening from vibration and protects against leaks. Ideal for heavy-duty applications in automotive, aerospace, and industrial equipment.

What Is The Difference Between Loctite 277 And Loctite 272?

Loctite 277 is a high-strength adhesive, while Loctite 272 is a high-temperature adhesive.

What Temperature Is Loctite 266 Rated For?

Loctite 266 is rated for temperatures up to 450°F, making it suitable for high-temperature applications.

What Is The Difference Between Threadlocker 271 And 272?

Threadlocker 271 and 272 are different in terms of their strength. 271 is designed for fasteners up to 1 inch and offers medium strength, while 272 is intended for larger fasteners up to 1. 5 inches and provides high strength.

Choose the appropriate threadlocker based on your specific application requirements.


In evaluating Loctite 266 vs 272, considerations differ. Both offer strong adhesive properties for diverse applications. Understanding their distinctions can lead to optimal product selection.

Make informed choices based on project requirements to achieve successful outcomes. Choose wisely between Loctite 266 and 272 for superior bonding results.

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