Blue Threadlocker Basics
Have you ever questioned which Loctite® Medium Strength Blue Threadlocker to use? Did you even know there are multiple kinds?
Of all our thread treatment applications, the Medium Strength Blue Threadlockers are the most commonly used. They are removable with standard hand tools on ¼ ” to ¾ ” fasteners, have fast fixture times, and are available in liquid, stick, paste, gel and tape form. The only question is which blue threadlocker is right for your particular use?
The four types that I will be discussing are:
Loctite® Threadlocker 242™
Loctite® Threadlocker 243™
Loctite® QuickTape® 249™ Blue Threadlocker Tape
Loctite® Blue Stick Threadlocker
Note: Although all Loctite threadlocker BOTTLES are red, the LIQUID in all four of the below products are blue. The red bottle is what distinguishes Loctite® threadlockers from other brands. Learn about the difference between Red, Blue, Green and Purple Threadlockers
The typical repairs that utilize this type of medium strength threadlocker range from valve cover bolts to carburetor studs. This is known as our all-purpose threadlocker, and is also known as the “original threadlocker.” It eliminates the need for expensive lock nuts and lock washers, seals even when it vibrates, and protects threads from corrosion.
Loctite 243 threadlocker is an upgraded version of Loctite 242, and is more of a general-purpose member of our “blue crew.” It is designed to have improved oil tolerance with surface-insensitive properties (plated fasteners no longer require primer), combined with the same overall benefits of the original Blue Threadlocker 242. Projects that would need this type of application include rocker studs, oil pans, disc brake calipers, pulley assemblies and many more.
Loctite 242 and 243 liquid blue threadlockers were so successful that we created two alternative physical forms of the product, for easier use on a wide variety of applications, described below:
Loctite Sticks are created in a semi-solid form, for easy over head applications. They are small enough to be “pocket friendly,” and will not leak, drip, or spill. They are also available for primerless and oil tolerant applications.
Loctite QuickTape is suppilied in a low tack film to provide a convenient and easy to use package, especially where a liquid product may be too fluid to stay on a part or may be difficult to apply. This product can be used for immediate assembly or days later, and provides consistent strength on a variety of metal substrates.
WATCH how to apply below. For more Loctite how-to, check out our YouTube Channel.
Both the stick and tape threadlocker products are used for difficult repairs and overhead applications, and both can be used for cleaner application purposes. They are most commonly used on applications that involve valve cover bolts, rocker arm adjustment nuts, carburetor studs, etc.
Note: The threadlockers linked above are Automotive Aftermarket products. For Industrial Assembly & Maintentance threadlockers, click here.
Now that you know the basics and the differences among our “blue crew” of threadlockers, it’s easy to see the benefits that each one can bring to help you complete every project with precision and quality.
You might also be interested in: When and Why to Use Purple Threadlocker