🔒 Lock it down, but keep control—fast, firm, and removable!
Loctite Threadlocker Blue 242 is a medium-strength adhesive designed to secure 6-19mm metal fasteners against loosening from vibration. It sets quickly in 10 minutes, fully cures in 24 hours, and protects against rust and corrosion while remaining removable with standard hand tools.
D**.
Keeps Bolts Tight Without the Hassle
’ve used Loctite Blue 242 on everything from motorcycle parts to furniture, and it works exactly as advertised. It keeps screws and bolts from vibrating loose, especially on items that see a lot of movement or stress. What I really appreciate is that it’s strong enough to hold, but not so permanent that you can’t remove the fastener later if needed.The application is easy — just a drop on clean threads before tightening, and you're good to go. It sets up nicely and doesn’t make a mess. I’ve had zero issues with rust or corrosion after use, and the bottle has lasted me a long time.Definitely recommend this for anyone who works on machines, tools, or even around the house. Just be sure you’re using it on parts you might want to remove later — this isn't the red (permanent) stuff!
K**O
Great to have around in your workshop!
Really good tool to have with you when you need a durable connection. I’ve used it on cars, home projects, and more. The bottle is smaller but keep in mind that you DON’T need a lot of it to get the job done. In fact, using too much would get pretty messy. I’d say, for how cheap it is, you should at least have a bottle because you never know when something might start to back out.
M**.
A Reliable Fix for Loose Screws
This removable threadlocker is designed for nuts, bolts, and fasteners sized 1/4” to 3/4” (6-20mm), perfect for securing scope mounts, rail screws, or even bike and motorcycle parts. Its anaerobic formula cures in 10 minutes and fully sets in 24 hours, locking fasteners against vibration, loosening, and corrosion while sealing out moisture. I applied it to the screws on my Pecawen Picatinny Rail and UTG QD Sling Swivel, and they’ve stayed rock-solid through range sessions and rough handling. The blue formula is removable with hand tools, so you can adjust or remove parts without a torch, unlike red threadlockers. Amazon reviews praise its effectiveness, with one user noting, “It’s perfect for firearms—my scope mount screws haven’t budged” (web:0). The 6 ml tube is small but goes a long way—a tiny drop per bolt is enough, making it cost-effective at $6-$10.
J**.
Did the Job. Locked Down Set Screw.
Kitchen faucet had to be tightened weekly or more with allen wrench. Put a dab of this on the set screw, let set overnight and have not had to tighten since. Going on about 7 months now.
J**K
Did not hold for one of my projects.
Much thinner of a liquid than expected. Also it didn’t hold the screws in the project I wanted to use it for. But maybe it’s not meant for metal on wood? The thin liquid made a mess while I was trying to complete my project which is why I give 4 stars.
S**A
Does the job!
No more re-tightening the screws on my kitchen chairs! I used to need to tighten the screws almost weekly and I haven't done it in months since using this product. Love it!
A**R
Don't skip this important step
If you tinker with electronics then this thread sealant is a "must have" for reassemble. Failure to lock tiny screws in place will result in those screws loosening and being lost.
S**S
Blue locktite, it is working, keeping a bolt from backing out.
Why did you pick this product vs others?:Good , I used this on a bolt on my motorcycle thatkept coming loose, it is staying in place.
Trustpilot
1 month ago
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