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0.20 oz Loctite 209728 Loctite Threadlocker Blue 242

4.8 4.8 out of 5 stars 37,200 ratings
Amazon's Choice highlights highly rated, well-priced products available to ship immediately.
Amazon's Choice in Thread Lock Sealers by Loctite

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0.2 Fl. Oz (Pack of 1)
Threadlocker

Purchase options and add-ons

Brand Loctite
Specific Uses For Product Threadlocker
Material Thread Sealant
Compatible Material Metal
Item Form Gel

About this item

  • Protects threads
  • Medium strength
  • Locks threads
  • Prevents rusting of threads
  • Can be removed with hand tools

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Product details

  • Is Discontinued By Manufacturer ‏ : ‎ No
  • Product Dimensions ‏ : ‎ 4.8 x 3.4 x 0.5 inches; 0.18 ounces
  • Item model number ‏ : ‎ 209728
  • Department ‏ : ‎ Unisex-Adult
  • Date First Available ‏ : ‎ January 16, 2007
  • Manufacturer ‏ : ‎ Henkel
  • ASIN ‏ : ‎ B000I1RSNS
  • Customer Reviews:
    4.8 4.8 out of 5 stars 37,200 ratings

Product Description

Product Description

Loctite Threadlocker Blue 242 is designed to lock and seal threaded fasteners and prevent loosening from vibration. Ideal for 6-19mm fasteners, this unique formula is great for small motors, mowers, and power equipment. Loctite Threadlocker Blue 242 protects threads and prevents from leaks, rusting, and corrosion and eliminates the need to stock up on expensive lock nuts and washers. Fast and easy to use, this medium-strength threadlocker sets in just 10 minutes and fully cures in 24 hours. Loctite Threadlocker Blue 242 is particularly suited for applications on less active substrates such as stainless steel and plated surfaces, where disassembly is required for servicing.

From the Manufacturer

Loctite Threadlocker Blue 242 locks threaded metal fasteners against loosening from machine vibration. It prevents leaks and rusting of metal threads for 1/4- to 3/4-Inch (6 mm to 20 mm) nuts and bolts. Metal parts can be removed with hand tools for easy disassembly if necessary. Sets in 20 minutes and cures in 24 hours. Especially useful for small motors, mowers and many types of power equipment.


From the manufacturer

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Threadlocker Blue Threadlocker Red
Customer Reviews
4.8 out of 5 stars
37,200
4.8 out of 5 stars
10,323
Size 6 ml 6 ml
Color Blue Red
Fastner size 1/4" - 3/4" Up to 1"
Torque (lbs./in.) break/prevail 110/43 250/275
Temperature range -65°F (-54°C) to 300°F (149°C) -65°F (-54°C) to 300°F (149°C)
Removable With hand tools Only removable with heat to nut or stud for 5 minutes at 450°F and with hand tools
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What's in the box

  • Thread Locking Adhesive
  • Product guides and documents

    Looking for specific info?

    Customer reviews

    4.8 out of 5 stars
    4.8 out of 5
    37,200 global ratings

    Customers say

    Customers like the quality, value, adhesion, and ease of removal of the bonding adhesive. For example, they mention it does what it's intended to do, it'll hold screws in place, and it'd be a good product for an inexpensive DIY. That said, some complain about the water resistance.

    AI-generated from the text of customer reviews

    1,145 customers mention1,025 positive120 negative

    Customers like the quality of the bonding adhesive. They mention that it works well, it holds screws in place, and is battle-tested and proven. Some say that it's good for scopes and sights and works with almost any material.

    "No joke this stuff holds like brazing metal together. I am impressed with how easy it is to use after appropriate surface prep...." Read more

    "...product off and on for many years and I find it to be a very well manufactured products and it seems to hold up well over the years I've used it on..." Read more

    "The product is good if you want to break the seal to clean." Read more

    "These seems to work quite well, however, as my first time using it, I did not expect how liquidity it is...." Read more

    290 customers mention264 positive26 negative

    Customers are satisfied with the adhesion of the bonding adhesive. They mention that it works well to keep screws in place and secures them in place. Some say that the product is medium-strength but still holds on tight. Overall, customers are happy with the product's adhesiveness and recommend it to others.

    "...and obviously like I say it does what it says it will do it holds the stuff in place and does not allow it to come apart until you want to take it..." Read more

    "Holds threads tight and is easier that the red thread lockers without overheating the parts." Read more

    "I have used blue Loctite for over thirty years. It has always worked good to keep screws from coming out and items from falling apart...." Read more

    "Works well used many times, same great results. Bolts stay tight and don't move till I go to remove." Read more

    155 customers mention119 positive36 negative

    Customers like the value of the bonding adhesives. They mention it's a good product, inexpensive, and a quality affordable product.

    "...I have never had a bad experience using Loctite products. Good price." Read more

    "Product was shipped quickly, was a good price and worked as described!" Read more

    "...very cost friendlyCons:- unexpectedly runny (quite low viscosity)-..." Read more

    "The price is rite." Read more

    98 customers mention87 positive11 negative

    Customers find the bonding adhesives easy to use. They mention it goes on easy, holds tight, and breaks loose easily with proper tools. They also say it's simple, inexpensive, and convenient. Customers say it applies well even for beginners, and secures bolts and screws from loosening due to vibration. They say it holds threads tight and is easier than red thread lockers without overheating the parts. Additionally, customers mention that the adhesive is easy to see when applying and has minimal adhesion power.

    "...I am impressed with how easy it is to use after appropriate surface prep. I little goes a long way. Easy to mix and use...." Read more

    "Holds threads tight and is easier that the red thread lockers without overheating the parts." Read more

    "Easy to use and apply, haven't had to take it off yet. But seems to be holding well." Read more

    "Not much to say since it’s pretty straightforward. I use this on a ton of screws and bolts. It definitely secures them in place...." Read more

    69 customers mention58 positive11 negative

    Customers like the ease of removal of the bonding adhesive. They mention that it is strong enough to hold but easy to remove when needed. They also say that it comes off easily enough, with a little elbow grease. Customers also say it allows nuts fairly easily to be removed.

    "...what it says it will do it holds the stuff in place and does not allow it to come apart until you want to take it apart which then you can" Read more

    "...Yet it breaks loose and is removable. You have to love this stuff." Read more

    "...After drying completely for 24 hours, it takes a little effort to unfasten hardware, which is exactly what I was looking for." Read more

    "Good for using for folding knife torx screws. Comes off easily enough but also holds reasonably strong." Read more

    87 customers mention10 positive77 negative

    Customers are dissatisfied with the water resistance of the bonding adhesive. They mention that it is very watery, has very little viscosity, and is runny. Some say that the product does not dry or seal.

    "...very cost friendlyCons:- unexpectedly runny (quite low viscosity)-..." Read more

    "...It is very watery! Amazed that it has worked this nicely." Read more

    "...I used this to secure them and worked well. Its a bit too watery and drips off easily so I had to be very gentle in applying it...." Read more

    "...He said that This works great, but the liquid is a lot looser than He thought...." Read more

    As important as gun oil is to a firearm...
    5 Stars
    As important as gun oil is to a firearm...
    Be careful when you cut the tip off the applicator because this stuff has the consistency of white out and will spill out of the tube if the hole is too big. I used a safety pin to make a hole which worked well because you don't need a lot of this to effectively do the job. I'd also recommend wearing rubber gloves when handling this otherwise you risk getting Loctite on your hands and whatever it is you're handling. One drop is enough to coat the threads of small screws, the type you'd find on the hardware of a rifle or handgun. I use this to secure my optics and foregrips or whatever else I'm throwing together. Cure time is 24 hours but noticeable after a few minutes so you want to work fast and efficiently when using this stuff. If you apply this to a set of screws and one takes longer to set than expected you might find that the other screws are already dry which means you'll have to apply more Loctite. It works when it's wet and as it dries it bonds to the metal between the threads to form a seal. If it's dried then it won't work it's magic. It doesn't take much to break the bond and I don't recall ever having a problem loosening a screw or bolt with blue Loctite on it. The red and green versions are supposed to be more permanent solutions and the purple will be the weakest Loctite out of the lineup. I keep a tube of this in my range bag and another one in my cleaning kit. If anything, it's peace of mind knowing my gear is going to operate the way I need it to should a situation arise where my life depended on that sort of thing.
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    Top reviews from the United States

    Reviewed in the United States on March 19, 2024
    Size: 0.2 Fl. Oz (Pack of 1)Style: ThreadlockerVerified Purchase
    Reviewed in the United States on December 8, 2023
    Size: 0.2 Fl. Oz (Pack of 1)Style: ThreadlockerVerified Purchase
    2 people found this helpful
    Report
    Reviewed in the United States on March 8, 2024
    Size: 0.2 Fl. Oz (Pack of 1)Style: ThreadlockerVerified Purchase
    One person found this helpful
    Report
    Reviewed in the United States on March 22, 2024
    Size: 0.2 Fl. Oz (Pack of 1)Style: ThreadlockerVerified Purchase
    Reviewed in the United States on January 28, 2024
    Size: 0.2 Fl. Oz (Pack of 1)Style: ThreadlockerVerified Purchase
    Reviewed in the United States on March 23, 2024
    Size: 0.2 Fl. Oz (Pack of 1)Style: ThreadlockerVerified Purchase
    Reviewed in the United States on March 23, 2024
    Size: 0.2 Fl. Oz (Pack of 1)Style: ThreadlockerVerified Purchase
    Reviewed in the United States on March 19, 2024
    Size: 0.2 Fl. Oz (Pack of 1)Style: ThreadlockerVerified Purchase

    Top reviews from other countries

    Translate all reviews to English
    Greig Parry
    5.0 out of 5 stars Excellent Product
    Reviewed in Canada on December 8, 2023
    Size: 0.2 Fl. Oz (Pack of 1)Style: ThreadlockerVerified Purchase
    Amazon Customer
    5.0 out of 5 stars Fantastic
    Reviewed in the United Kingdom on March 14, 2024
    Size: 0.2 Fl. Oz (Pack of 1)Style: ThreadlockerVerified Purchase
    Leonidas Anagnostopoulos
    5.0 out of 5 stars Does the job
    Reviewed in Germany on August 19, 2023
    Size: 0.2 Fl. Oz (Pack of 1)Style: ThreadlockerVerified Purchase
    Monica Augusta Albreghs
    5.0 out of 5 stars Ottimo prodotto!
    Reviewed in Italy on February 8, 2020
    Size: 0.2 Fl. Oz (Pack of 1)Style: ThreadlockerVerified Purchase
    Tim
    5.0 out of 5 stars Does the job.
    Reviewed in Australia on January 8, 2024
    Size: 0.2 Fl. Oz (Pack of 1)Style: ThreadlockerVerified Purchase