Loctite Threadlocker Red 271 - Permanent Thread Lock Glue for Nuts, Bolts, & Fasteners, High Strength Screw Glue to Prevent Loosening & Corrosion - 6 ml, 1 Pack

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.

’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!

This threadlocker works exactly as it should. I’ve used it on everything from tools to automotive parts, and once it cures, bolts stay secure with no loosening from vibration or use.It’s easy to apply, sets up quickly, and gives peace of mind that everything will stay tight over time. Whether for small screws or larger fasteners, it performs great every time.Reliable, strong, and a must-have in any toolbox. Highly recommend!

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.

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.

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.

Good stuff...been around for years and nothing has come along that is better.

Dries Quickly. Seals well. Sticks the bolts down. Easy to use and doesn't make a mess. Heat Resistant.