What’s the difference between Loctite 243 and Loctite 262?
Both can be used for threadlocking and sealing applications but 243 may be better suited for applications requiring disassembly while 262 for more heavy-duty permanent locking.
Loctite 243 Vs 262: Specs & Uses
🌡️Max Temperature Resistance
Loctite 243: 200°C
262: 150°C
🆚Chemical/Solvent Resistance
Loctite 243: Resistant to motor oil, unleaded gasoline, brake fluid, water/glycol mix, acetone, ethanol
262: Resistant to motor oil, unleaded gasoline, brake fluid, water/glycol mix, acetone, ethanol
🛠️Common Uses
Loctite 243 allows for the removal of fasteners using ordinary hand tools; effectively stops diesel leaks from threaded joints; and offers a wide service temperature range of -55 to +180°C, making it suitable for applications in extreme temperature conditions.
262 is suitable for use on motorized bike kits to secure fasteners; heavy-duty solution for hanging pictures; securing nuts and bolts in different applications.
Technical Info
My Hands-on Test: Loctite 243
According to my research, Henkel has factories in multiple countries that make Loctite products.
✅Pros: Loctite 243
Let’s put the origin debate aside and talk about performance. Loctite 243 worked great on a 14mm bolt/nut I used for an automotive application. Applying the thick formula was easy and it set up in an hour. In the morning, when I tried to remove the nut, the threadlocker pulled it like a metal deformation locknut all the way to the end.
Make sure the rear derailleur hanger is secure. This one was loose. Common issue. I use Loctite 243 to keep it secure for longer.
Loctite 243 Vs Loctite 270
The LOCTITE® 243 is a versatile threadlocker designed to create a moderate strength bond. It is suitable for use on various metals, including stainless steel, aluminum, and plated surfaces. The product has demonstrated tolerance to slight contamination caused by industrial oils such as motor oils, corrosion prevention oils, and cutting fluids.
The LOCTITE® 270 has also shown tolerance to minor contamination from industrial oils like engine oils, corrosion prevention oils, and cutting fluids. Disassembly can be achieved by heating the assembly to 300°C.
Loctite 222 vs. 243
For screws up to 1/4″, I recommend the low-strength Loctite 222 (purple liquid). It’s easy to remove with just a hand tool. If you’re working with screws ranging from 1/4″ to 3/4″, the medium-strength options are Loctite 243 (blue liquid) and Loctite 248 (blue stick).
Applying Loctite 243
For those who were concerned about the bottle being half full, it’s important to understand that Loctite is a chemical that cures when exposed to low air levels. That’s why some air space is necessary inside the bottle.
Rest assured, the liquid volume you expect is precisely what you will receive. In fact, I’ve learned that they even use a container that “breathes” to accommodate this requirement.
❌Cons: Loctite 243
Some people have expressed concerns about the amount of liquid in the bottle. However, I believe they may have unrealistic expectations. This bottle contains the amount of liquid as described, and a little goes a long way. You only need a couple of drops per application, so even though the bottle may not be completely full, it’s enough to last most people a very long time. Considering the price and the longevity of the product, I can’t see how anyone could feel ripped off unless they’ve never used it before.
FAQ: Loctite 243
Q: What are the benefits of using Loctite 243 Vs. Loctite 242 for medium-strength applications?
A: Loctite 243 cures slightly faster and is less sensitive to surface cleanliness than Loctite 242, making it a better choice for medium-strength applications. Unlike Loctite 242, which requires a clean, dry, non-greasy surface on both items being connected and only works with ferrous materials, Loctite 243 works with any material and is more versatile while offering similar functional characteristics to 242.
Q: Would Loctite 243 be suitable for holding copper tubes carrying hot water?
A: Loctite 243 is designed for use on threaded fasteners only and is not suitable for holding copper tubes together. Soldering is the recommended method for joining copper tubing.
Q: What is the temperature range for Loctite 243? Is it waterproof?
A: Loctite 243 has a service temperature range of -55 to +180°C. It is waterproof and effective for locking and sealing threaded fasteners. For greater security, Loctite 638 green can be used for permanent fastening, and Loctite red can be used for fastening that can be undone with heat.
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My Hands-on Test: Loctite 262
✅Pros: Loctite 262
It turned out to be all I needed for my specific task. The best part is that the packaging allows you to save and reuse any remaining sealer, which is a great feature in terms of cost-effectiveness.
Drilled, tapped, and assembled baffles inside the valve cover after deep cleaning for any debris left from sandblasting/powder coating. M5 – 0.8 button head bolts with Red Loctite 262 Threadlocker.
LOCTITE 262 is designed for the permanent locking and sealing of threaded fasteners. The product cures when confined in the absence of air between close-fitting metal surfaces and prevents loosening and leakage from shock and vibration.
Versatility
In addition to its effectiveness in my tractor and rototiller applications, LOCTITE 262 has proven to be versatile. I’ve used it extensively on my RC cars and planes, and it has worked flawlessly. It’s also great for automotive use, providing secure and long-lasting results.
❌Cons: Loctite 262
However, I did notice that it ran out quite fast, and considering the price point, I would have appreciated a little more product.
FAQ: Loctite 262
Q: Which threadlocker should I use for guns, such as scope mounts? Should I opt for Blue 242 or one of the red options? There are numerous choices available, excluding high-temperature variants.
A: If you intend to use threadlocker on a scope mount or rings, I recommend sticking with Blue 242. See my test here: Loctite 242 vs. 271 
. It is crucial to follow the manufacturer’s torque settings when setting up a scope. I would also suggest investing in a reliable torque wrench to ensure that you don’t overtighten the hardware.
Q: Can Loctite 262 be used in fuel systems, specifically with diesel or gasoline engines?
A: It t is designed to be applied to dry nuts and bolts free of solvents. Use your own judgment when considering its use in fuel systems.
Q: How can I loosen the threadlocker once it’s applied?
A: To loosen the threadlocker, you will need to apply heat using a hot torch or a similar method. Red Loctite 262 is not easily removable, so if you anticipate disassembly, consider using blue threadlocker instead.
I’m Ronald Stevens, a Mechanical Engineer obsessed with adhesives, glue, and all things sticky! My passion began in childhood when I’d always be the one playing with glue during arts and crafts. And I’d spend hours researching and experimenting. Happy reading, and remember: stick with the best, and you’ll never be stuck in a mess!
Feel free to contact me and join our discussion:
Is it possible to remove fasteners using ordinary hand tools with Loctite 243?
Yes, ordinary hand tools can be used to remove fasteners that have been treated with Loctite 243. This threadlocker is designed to offer similar functionality to Loctite 242, but with greater versatility as it can work with any material and does not require a perfectly clean surface.