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🔧 Lock it down like a pro — no loosening, no surprises!
LOCTITE 271 Threadlocker Red is a high-strength, anaerobic adhesive designed for heavy-duty automotive use. It bonds securely to all metals, tolerates minor oil contamination, and withstands shocks, vibrations, and temperatures up to 140°F. Setting begins in 10 minutes with full cure in 24 hours, making it ideal for large bolts and studs in critical applications. Trusted by professionals and OEMs alike, it ensures durable, reliable fastening that only requires heat for removal.









| ASIN | B0DF4NB8CY |
| Best Sellers Rank | #9,467 in Automotive ( See Top 100 in Automotive ) #32 in Thread Lock Sealers |
| Brand | Loctite |
| Brand Name | Loctite |
| Color | אדום (red) |
| Compatible Material | Aluminum |
| Container Type | Tube |
| Customer Reviews | 4.8 out of 5 stars 668 Reviews |
| Full Cure Time | 24 hours |
| Included Components | (1) LOCTITE 271 Threadlocker for Automotive | Red, 6 ml Tube |
| Item Form | Tube |
| Item Package Quantity | 1 |
| Item Type Name | automotive-thread-lock-sealers |
| Item Weight | 13.61 g |
| Manufacturer | Loctite |
| Material | Methacrylate-based Resin |
| Material Type | Methacrylate-based Resin |
| Model | 37421 |
| Number of Pieces | 3 |
| Other Special Features of the Product | High-Strength, High-Temp, Removable with Heat |
| Part Number | 37421 |
| Special Feature | High-Strength, High-Temp, Removable with Heat |
| Specific Uses For Product | Automotive |
| Volume | 18 ml |
| Water Resistance Level | Water Resistant |
S**S
Awesome product.
This works again as advertised, i used it to install my V6 muzzle brake on my KSG and it worked great, that thing has not flinched a millimeter from when i first set it and it's been there for months and hundreds of rounds mostly slugs or 00 buck shot out of it, i think i've shot about 6 shells of birdshot in my life and not with this shotgun. It just works for weapons applications just make sure what you're using it for you're not intending to remove regularly cuz i would assume it would suck for you then, use the blue loctite instead which i have for regular bolts and such.
M**E
Cannot beat for large hardware in critical application
Red Loctite is great for big, critical hardware applications. I usually default to blue Loctite for just about all the applications I find, but this time I was replacing wheel bearings and disc brake mounts on a 1 ton pickup, so that included both big hardware AND critical applications - really don't want those working loose over the next 50,000 miles!!! That would be a heck of a surprise. As usual, very easy to use in the tube - just apply a bit to the leading edge of the threads, run the bolt in, and torque it down. Of course, removing hardware with red Loctite is no joke but there's always heat if needed! That also means that the hold is fantastic and again, shouldn't work loose until it's intentionally persuaded with force and/or heat. So ease of removal is not easy at all - but that's the point! Applying out of the tube is very easy: just open the cap and cut off a tiny edge of the nozzle, then apply just a little bit (I've learned not to apply too much - it's just unneeded). Definitely not messy either, which is fantastic. When you apply it to threads, it really clings to the threads, allowing you time to get it in place and run down to torque. But it's also just runny enough to really work its way down into the threads. So overall, if you need to make sure a big piece of critical hardware doesn't move until you absolutely need it to, there's no better option that this red Loctite!
C**5
Caution
Use this on nuts and bolts you never want to remove only 👍
R**1
Bought for high heat
Used for muzzle device. So far seems to be working fine.
M**E
He loves it!
I am a retired A.S.E. master technician and have used thread lockers many times over many years. This time I was fixing a friends revolver barrel that had come loose and was rotating. Problem solved and my buddy is once again a straight shooter.
P**G
expensive for what you get
they sell it in milliliters to make it look like your getting a lot, but for the price your getting this tiny tube with just a bit inside. i haven't use it yet, because i don't need to lock things down just yet, i know the blue version tends to fail over time. but for the value, i might as well just epoxy things on in the future.
S**E
Great permanent bolt locker
I used this to lock in bolts on my boat that will face heavy vibration. Been using it for years and have no had backing out issues. Highly suggest using this for any heavy duty threaded bolt situation. Be advised that this stuff can make it very difficult to remove a bolt later on. Other than that, go ahead and lock up them bolts!!
G**.
It absolutely works great and does what it says it will do.
We use Chicago screws to secure leather straps in places where most people may rivet. This allows for is to create a product that has a longer life. But we had a slight problem with the screws coming loose in certain circumstances. So now we use one of three different loctite threadlockers (based on the usage that our product will get). This allows us to still use screws, and to unscrew the screw it with a little extra work. This product has allowed us to continue our manufacturing process with very little change to our process. It absolutely works great and does what it says it will do.
N**S
Did the job perfectly
Replacing axle nuts on my ‘06 Corvette. Locked them on the shaft easily. As recommended, waited 24 hours for the thread lock to set properly.
D**Y
a little bit costly.
Very good.
C**N
Tès bon prix
Bon achat à un prix inférieur.
D**É
Efficacité
Filetage adapteur pour moteur
N**E
tres bon produit
tres bon produits
Trustpilot
4 days ago
2 weeks ago