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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 | #42 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 42,584 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 | 1.0 Count |
| 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.
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.
K**C
Great product
Used on the screw that help my faucet handle on. Works great.
M**S
Locks Everything Down with Confidence
This heavy-duty thread locker works well for securing bolts and preventing them from loosening over time. It applies easily and creates a strong hold once fully cured. It’s especially useful for vibration-prone equipment and automotive projects. A little goes a long way, so careful application is important. Overall, it’s a reliable product for keeping hardware secure under demanding conditions.
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.
N**L
Used for optic mounting
Haven’t had any issues. Tip needs to be cut, be ready with a wipe for a little pressure release upon opening. Will update if anything changes.
B**N
No more wobbly table
This stuff is amazing. My table and chairs were wobbly and screws just kept coming loose. After putting this on the screws and tightening them, there has been 0 wobble!
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.
M**H
Excellent product.
Working very good as mentioned.
Trustpilot
2 months ago
4 days ago