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🔧 Lock it down like a pro — don’t let your bolts bail on you!
Loctite 271 Threadlocker is a high-strength, red anaerobic adhesive designed for permanent locking and sealing of metal fasteners up to 1 inch. It cures rapidly within 10 minutes and fully in 24 hours, tolerates industrial oils, withstands temperatures from -65°F to 360°F, and offers military-grade durability tested to MIL-S-46163A standards. Ideal for automotive, industrial, and heavy-duty applications requiring secure, vibration-resistant fastening.









| ASIN | B0028OJAIY |
| Best Sellers Rank | #7,335 in Automotive ( See Top 100 in Automotive ) #39 in Automotive Fillers, Adhesives & Sealants |
| Brand | LOCTITE |
| Brand Name | LOCTITE |
| Color | Red |
| Colour | Red |
| Compatible Material | Metal |
| Container Type | Tube |
| Customer Reviews | 4.7 out of 5 stars 638 Reviews |
| Full Cure Time | 24 Hours |
| Global Trade Identification Number | 00079340374218 |
| Included Components | (1) 271 Red Heavy Duty Threadlocker, 6-milliliter Tube |
| Item Form | Gel |
| Item Package Quantity | 1 |
| Item Type Name | automotive-thread-lock-sealers |
| Item Weight | 0.01 Pounds |
| Item form | Gel |
| Manufacturer | Loctite |
| Material | Metal |
| Material Type | Metal |
| Model | 37421 |
| Number of Pieces | 1 |
| Other Special Features of the Product | Strong |
| Part Number | 37421 |
| Special features | Strong |
| Specific Uses For Product | Automotive, Industrial, DIY, Furniture, Heavy-Duty |
| Specific uses for product | Automotive, Industrial, DIY, Furniture, Heavy-Duty |
| UPC | 079340374218 |
| Unit Count | 1 Count |
| Viscosity Level | Low |
| Volume | 6 Milliliters |
| Water Resistance Level | Water Repellent |
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.
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.
C**N
Tès bon prix
Bon achat à un prix inférieur.
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!
D**É
Efficacité
Filetage adapteur pour moteur
Trustpilot
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