The Difference Between Red, Blue, Green and Purple Threadlockers

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Ever get confused about which threadlocker to use? Do you know what the differences are between the red, blue, green and purple threadlocker? You aren’t alone – we here at Henkel hear this question a lot and are here to tell you the difference.

Our products are available in many different grades to cater to a broad array of applications, from auto maintenance and boat maintenance to a wide range of household product repair. These different grades are color-coded to help you distinguish one threadlocker from another.

The color refers to the actual substance, but all the bottles are red in color. The red bottle is actually a LOCTITE® trademark. It’s what visually distinguishes LOCTITE® threadlockers from any other brand.

LOCTITE® Red Threadlocker

LOCTITE® Red Threadlocker is the highest strength. This product cures fully in 24 hours and is available in both a liquid and as a semisolid anaerobic. The red products are so powerful that they require heat to be disassembled. A primerless grade red threadlocker is also available.

You might also be interested in: How to Remove Red Threadlocker

LOCTITE® Blue Threadlocker

LOCTITE® Blue Threadlocker is medium strength. Again this product cures fully in 24 hours and can be disassembled with hand tools. In addition to being available in a liquid and a semisolid, there is also LOCTITE® QuickTape 249™ Threadlocker; the one and only of its kind globally. A primerless grade blue threadlocker is available as well.

You might also be interested in: Blue Threadlocker Basics

LOCTITE® Green Threadlocker

LOCTITE® Green Threadlocker is recommended for locking preassembled fasteners, e.g. electrical connectors and set screws. The product is categorized as medium-to-high-strength for wicking. It is also available in a liquid form, cures in 24 hours and can be removed with heat and hand tools.

LOCTITE® Purple Threadlocker

LOCTITE® Purple Threadlocker, also known as LOCTITE® 222™, has become one of our most successful products. LOCTITE® 222™ cures in 24 hours. It can also be used on low-strength metals such as aluminum and brass. This offers a lot of flexibility to the user.

Find customer testimonials and more information on our purple threadlocker in When and Why to Use Purple Threadlocker.

All LOCTITE® Threadlockers

Alll LOCTITE® Threadlockers have a broad temperature resistance of -65°F to 300°F, some going up to as high as 650°F. Threadlockers were LOCTITE®’s first product line. They combine a mix of complex chemistry and engineering. Simply put, this product is an anaerobic adhesive applied by drops to the threads of fasteners. It then cures to a hard thermoset plastic that locks the threads together. They are used only for metal-to-metal applications.