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🔧 Lock it down, loosen up later — the smart fix for every fastener!
Loctite Threadlocker Blue 242 is a medium-strength, fast-setting liquid designed to lock and seal metal fasteners sized 6-19mm. It prevents loosening caused by vibration, protects against rust and corrosion, and allows easy removal with hand tools. Ideal for small motors, mowers, and power equipment, it sets in 10 minutes and fully cures in 24 hours, making it a reliable, time-saving solution for professionals and DIYers alike.






| ASIN | B000I1RSNS |
| Best Sellers Rank | #40 in Automotive ( See Top 100 in Automotive ) #1 in Thread Lock Sealers |
| Brand | Loctite |
| Brand Name | Loctite |
| Color | Blue |
| Compatible Material | Metal |
| Container Type | Tube |
| Customer Reviews | 4.8 out of 5 stars 42,419 Reviews |
| Full Cure Time | 24 Hours |
| Global Trade Identification Number | 00079340242005 |
| Included Components | Loctite Heavy Duty Threadlocker, 0.2 oz, Blue 242, Single |
| Item Form | Liquid |
| Item Package Quantity | 1 |
| Item Type Name | Blue 242 |
| Item Weight | 5 Grams |
| Manufacturer | Henkel Corporation |
| Material | Dimethylacrylate ester |
| Material Type | Dimethylacrylate ester |
| Model | Henkel / osi -tanch-it- |
| Number of Pieces | 1 |
| Other Special Features of the Product | Strong |
| Part Number | 209728 |
| Special Feature | Strong |
| Specific Uses For Product | Threadlocker |
| Tensile Strength | 110 Pounds Per Inch |
| UPC | 079340242005 |
| Unit Count | 6 Milliliters |
| Viscosity Level | Medium |
| Volume | 6 Milliliters |
| Warranty Description | Warranty |
| Water Resistance Level | Water Resistant |
A**R
Works as it should. Excellent product
What else can be said about blue loctite. Use sparingly. A little can go a long way. Easy to use. Great value. Holds screws in place as it should
R**Z
Useful for bike repairs and loose bolts
X when working on my bike, the Loctite Blue 242 helps secure bolts nicely. It stays in place but still comes off when I need to remove parts later. The medium strength is just right for most jobs around the house and in the garage. The 6 ml tube is small but lasts through multiple projects. It does what I need without any hassle or mess.
E**S
Best stuff to keep your threaded parts together! Can be removed with some effort, not by accident!
I have used this for more than 40 years. Always works. Easy to apply (More is not better). A slim stripe along the threads will do the best and will permit you to break the seal, with some effort. Whatever threads you "locK" will not unthread due to vibration or stress but can be unlocked, if needed. Especially effective on loose or worn threads. A little bit goes a long way. I usually apply it to the threads sparingly for best effect. If you want the threads to permanently NEVER come loose, use the Red. Have always had a tube of this around for the last 40 years. No need to overtorque (tighten) and risk stripping threads or breaking a bolt.
K**C
Great product
Used on the screw that help my faucet handle on. Works great.
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.
L**S
Helpful for quick fixes
My experience with loctite blue 242 has been pretty good. i used it at work to secure bolts in machinery, and it holds well but still allows me to unscrew when needed. the small 6 ml tube is handy, and i feel confident it prevents parts from loosening over time. overall, it’s a nice product for light to medium fastening jobs around the shop.
B**G
BEST WAY TO PREVENT LOOSE SCREWS
Use mainly to put together custom 2.5" computer hard drives, so they don't come loose, but great for all things with screws. Blue is a temp glue lock; the red is permanent (like super glue); don't get them confused.
M**L
Use this threaded lock for work and travel
Since i started applying it to my bike bolts, they stay tight longer. it's nice that it’s removable if needed without much hassle. the small 6 ml bottle lasts quite a while, and it really gives me peace of mind knowing my fasteners won't come loose unexpectedly. simple to use and works well for keeping things secure on the go.
A**R
good product
the product is good and serves its purpose. value for money. it is durable and holds the screw in its place. very easy to use
L**S
Does the job
Shake before use.
O**T
Colle correspondant exactement au descriptif.
Colle correspondant exactement au descriptif. Elle n 'a pas coulé autour si on prend soin de mettre juste ce qu'il faut en tenant compte que cela peut déborder en appuyant pour fixer.
1**N
Excellent quality
I am highly satisfied with this product; it is an excellent item to have readily available. I will undoubtedly repurchase it in the future. Thank you, seller.
M**5
Locktite
Much cheaper than buying elsewhere in shops or online even. Perfect size. Reseals well for use down the track.
Trustpilot
1 day ago
1 month ago