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Your cart is empty.The LOCTITE Automotive Threadlocker Blue 242 is a high-temp, medium-strength threadlocker trusted by professionals and OEM-specified. Designed by auto manufacturers and lab tested, it works on all metals, including stainless steel, aluminum, and plated surfaces, making it perfect for securing nuts and bolts in automotive applications. Ideal for valve cover bolts, water pump bolts, oil pan bolts, and more, it provides a reliable hold that resists vibration and loosening. This product is great for automotive maintenance and other settings where regular servicing is required. It sets in just 5 minutes and fully cures within 24 hours, delivering long-lasting performance. With a 6 ml tube, LOCTITE Blue 242 is a dependable, easy-to-use solution for any automotive repair or maintenance project.
Francisco
Reviewed in Mexico on March 8, 2025
Efectivo
D. Anderson
Reviewed in the United States on January 12, 2025
Came in very good order, encased in OEM packaging. Always confusing about the 'blue' vs 'red' vs. blue that comes red, but this is the one that can be removed later. Costs more than Dom Perignon but that's always been the case.
Jayden
Reviewed in the United States on January 10, 2025
Worked great on my mini bike muffler that was loosening off the straight pipe.
Luis
Reviewed in the United States on June 6, 2024
Worked for installation on am inflatable kayak.
JB
Reviewed in the United States on April 17, 2024
Great product!
heath brockway
Reviewed in the United States on January 8, 2023
Not sure what I'd do without the blue thread locker...its what I use on all my rc cars when I have any fasteners threading into metal. It holds well enough to prevent backing out of screws and bolts but it doesn't cause any issues when I need to remove them either. In my case a little goes a long way and small tube lasts along time. An inexpensive fix to help prevent issues later on down the track, or road. Great product!
andrew
Reviewed in the United States on July 24, 2022
This is easy to use and works well but the price is ridiculous.
Rene Berber
Reviewed in Mexico on May 11, 2020
Hay aplicaciones que requieren, o al menos es muy recomendable, utilizar un fijador de rosca. Para eso está toda la línea de estos productos Loctite que resaltan por su calidad.Este producto lo utilizo al ensamblar piezas en mi moto, y va a ser igual de útil en el carro. Esto es dónde la vibración puede hacer que se afloje algo.
Pierre El Harbie
Reviewed in Canada on March 16, 2018
Works perfect!!!
RicD
Reviewed in Canada on December 5, 2018
Great product works as it should
JJCEO
Reviewed in the United States on February 7, 2016
I started using Loctite products over 45 years ago and I learned how well it performed while assembling aluminum parts for instrumentation. I now use it on my guns as I assemble them to prevent parts from coming loose from shock and vibration. I just put together a new AR15 build and I used it all over the gun for the accessory parts. I installed a new Magpul MIAD pistol grip, a Magpul vertical rail grip, a tactical flashlight, a Magpul front and rear MBUS set of sights, a Vortex 3X flip up scope and a Daniels Defense Omega Free floating hand guard quad rail. All of the screws and Allen head screws had Loctite applied as I did the assembly. I even applied it to the mounting screws on the Aimpoint Pro red dot sight.I like the blue Loctite as it helps to hold the screws more securely in place and helps to prevent corrosion which is important on a rifle or gun. The blue formulation locks the parts in place but you can still take the gun apart when you need to. I recommend that you not use the red Loctite on gun assembly and it is very difficult to take apart as it has a much stronger holding power.This is a great product with a proven history of working in difficult applications. I rated it at 5 stars and I recommend it to you.
EisNinE
Reviewed in Canada on January 21, 2015
I own a Benchmade 52 'Morpho' Balisong and a Benchmade 'Contego' Axis-lock, and coincidentally, they both needed Loctite 'Threadlocker' 242 to keep the pivot screw from loosening. The Balisong needed threadlocker on every screw, which I only realized when one of the tiny zen-pin screws went flying amidst the flipping. If you own knives, this is the stuff you want. If you have no idea what the f*** I'm babbling about, this still might be the stuff you're looking for. It locks screws up solid, but not so solid you can't break the grip with a driver. It won't mess things up irrevocably if you apply it then realize you forgot a washer, for example. But as far as hard use, preventing screws from loosening due to vibration and shock, it's excellent.
Alan Z
Reviewed in the United States on April 13, 2015
Don't want screws to come out or nuts to fall off? Get Loctite. I've ben using this stuff for years, most recently to stop a screw in a office chair from falling out. Loctite holds things securely, but can be deliberately "broken" with a sharp twist of a screwdriver or wrench.I'd call this a "medium duty" thread locker -- great for chairs, eyeglasses, gun parts, and just about anything threaded not subject to intense vibration. For example, I would use Loctite Blue on interior parts of a car, but not on screws related to the drivetrain. I find Loctite Blue to work well with metal and strong, stiff plastics. It does not make a good bond with porous materials like wood, sheetrock or concrete, or on very bendable plastics. It handles weather quite well, so you can use it for outdoor applications.I have never had a piece secured by Loctite Blue come apart accidentally, and I've also never had problems "breaking" the Loctite to get the screw, nut or bolt out.By the way, there is an industrial strength version, Loctite Red. However, it is extremely difficult to remove Loctite Red, so only use it in situations where you don't plan to ever remove the screw, nut or bolt.
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