






🔒 Lock it down, loosen it up — the pro’s choice for lasting hold!
Loctite Threadlocker Blue 242 is a medium-strength gel adhesive designed to lock and seal threaded fasteners from 6 to 20 mm, preventing loosening caused by vibration. It protects against rust and leaks, sets quickly in 10 minutes, and fully cures in 24 hours. Removable with hand tools, it’s perfect for automotive, construction, and DIY projects requiring reliable yet serviceable fastening.






| ASIN | B01EZTPX8A |
| Best Sellers Rank | #39 in Automotive ( See Top 100 in Automotive ) #1 in Thread Lock Sealers |
| Brand Name | Loctite |
| Color | Blue |
| Compatible Material | Metal |
| Container Type | Box |
| Customer Reviews | 4.8 out of 5 stars 50,787 Reviews |
| Full Cure Time | 24 hours Hours |
| Global Trade Identification Number | 30079340242006 |
| Included Components | Loctite - 209728 - 12pk |
| Item Form | Gel |
| Item Height | 4.73 inches |
| Item Package Quantity | 1 |
| Item Type Name | Loctite - 209728 - 12pk |
| Item Weight | 0.1 Pounds |
| Manufacturer | Henkel Corporation |
| Material Type | Stainless Steel |
| Model | 209728-12 |
| Other Special Features of the Product | Vibration |
| Specific Uses For Product | Automotive, Construction, DIY Projects |
| UPC | 707934024200 |
| Unit Count | 12.0 Count |
| Viscosity | Medium viscosity gel |
| Volume | 15 Milliliters |
| Water Resistance Level | Not Water Resistant |
M**W
Awesome product
Worked great to keep the screws tightened in our bathtub faucet handles. Easy to apply! Every time we turned the water on the screws in the handles would loosen and the handles would rattle. I finally got this product, put it on the screws, tightened and let it sit over night and the screws are now solid tight and problem is solved. It has been months now and still holding strong! Thanks!
D**A
Impressed with the loctite threadlocker blue 242
Was using it to secure bolts at home and found it handy. Tried opening it one-handed and it worked smoothly. Prevented loosening and corrosion effectively. Pleased with the overall product quality and performance. Definitely a good purchase for anyone needing a reliable thread lock glue.
S**E
Essential Tool for Securing Small Screws
This tool is a game-changer for handling tiny screws and delicate moving parts without the fear of losing them. Perfect for firearm enthusiasts needing precision when installing sights or other components. The application is a breeze with the convenient dripper-style tube. A little goes a long way, especially with the red solution, ensuring long-lasting use. I purchased a tube years ago, frequently use it, and there's still plenty left – talk about value for money!
J**N
Long lasting
I purchased this Loctite primarily to secure the optic on my home defense firearm, and it has performed flawlessly. After multiple range sessions and hundreds of rounds fired, my optic hasn't shown even the slightest bit of movement - exactly what I needed for a critical application where reliability is paramount. The product proved so effective that I started using it for household repairs too. Those annoying, constantly-loosening ceiling fan screws that created a shaky noise? Completely silenced after application. The medium-strength formula seems perfect - strong enough to keep things secure, but still allows for disassembly when needed with standard tools. Application was simple with the precise nozzle, and a little goes a long way. I appreciate that it dries clear and doesn't leave messy residue. For anyone needing to secure screws in firearms, machinery, or household items, this Loctite delivers professional-grade results. For those using it for firearm related screws: Always follow manufacturer instructions for firearm applications and allow proper cure time before use.
E**S
Strong hold, yet removable when needed
Strong hold, yet removable when needed I’ve used Loctite Threadlocker Blue 242 on everything from automotive bolts to small machine screws, and it’s one of those products you end up reaching for more often than expected. It provides a nice middle ground: strong enough to keep fasteners from loosening due to vibration or everyday use, but still removable with standard hand tools when you need to take something apart later. I recently used it on a set of bolts for an outdoor project, and even after weeks of exposure, they stayed tight with no signs of backing out. The consistency is easy to work with—just a drop on the threads goes a long way. The small 6 ml tube is convenient for keeping in a toolbox or glove compartment, and it dispenses cleanly without making a mess. It also helps prevent rust and corrosion on the threads, which is a nice bonus if you’re working on vehicles or equipment exposed to the elements. A couple of things to keep in mind: this is a medium-strength formula, so it’s not for heavy-duty applications where you need a permanent lock (for that, you’d want Loctite Red). Also, it takes a little time to fully cure, so give it that window before putting things under full load. Bottom line: A reliable, easy-to-use threadlocker that’s perfect for everyday maintenance and repairs, offering strong but removable security for nuts, bolts, and screws.
C**O
Reliable Loctite Adhesive for Secure Fastening
Applying this Loctite adhesive is a breeze thanks to its precise nozzle, and you'll be amazed at how little you need for a strong bond. One thing I love is that it dries clear without any messy residue left behind. Whether you're working on firearms, machinery, or household projects, this product is a game-changer, providing professional-grade results every time. Highly recommend it for anyone looking for a reliable solution to secure screws effectively.
D**W
What more to say, it works!
This product does what it says it does. It's a quality product that holds screws in tightly and firmly, and won't back out. It's a little messy at first, but once you get the feeling of how much pressure to apply (you don't need much), you can fine tune how much comes out of the tube. This size tube should last me a while! Overall easy to use and a great value for people needing a small amount of thread locker.
S**W
Tight
Loctite worked great for me. Had some screws backing out form the bold. Applied to the treads and no more issues.
Trustpilot
1 month ago
1 month ago