Loctite 609 vs. 680: what’s the difference?
Loctite 680 has a higher viscosity, faster cure speed, higher strength, and better temperature/chemical resistance compared to Loctite 609. Loctite 609 may be preferred where a slower cure speed is acceptable.
Loctite 609 vs. 680: Specs & Uses
⚗️Chemical Resistance
Loctite 609: 80-100% strength retained after 100-1000 hrs
Loctite 680: 90-100% strength retained after 100-1000 hrs
🆚Temperature Resistance
Loctite 609: 80% strength retained till 150°C
Loctite 680: 85% strength retained till 175°C
🛠️Common Uses
Loctite 609 is perfect for creating a strong and permanent bond between nuts and bolts in 3D printer assemblies; mounting new bushings in excavator buckets; and can be used for securing cylindrical parts, such as bearings, gears, and shafts.
Loctite 680 can be used to bond non-ferrous metals; mount small precision instruments, such as a mounted micrometer; slip-fit applications; ideal for threaded connections under high temperatures.
Technical Info
My Hands-on Test of Loctite 609
✅Pros: Loctite 609 Retaining Compound
First, let’s talk about some common questions about the product itself. The bottle has a unique dispenser that requires piercing to access the compound inside. Simply removing the white cap won’t work. As for shipping, while lead times can vary, I typically receive my orders within 10-15 days.
Application Versatility – There are a lot of materials and environments that 609 can handle. I’ve successfully used it to secure pressed-in bushings within automatic transmissions, retain oil seals against high pressures (up to 60 psi), and even bond tapered roller bearing races with minor looseness issues. It has also proven effective for sticking outer pulley rings back onto harmonic balancers, though epoxy adhesives like JB Weld are sometimes used for that application as well.
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Heat Resistance – Many users wonder about the heat resistance of 609, especially for applications like spark plug threads. While I wouldn’t recommend using it directly on spark plug threads (as excessive heat can make removal difficult), this retaining compound can withstand temperatures up to 300°F (149°C).
Removal and Disassembly – Many people wonder if parts bonded with 609 can be disassembled later. From my experience, while it does take some force to separate components, it is possible to remove them at a later date. Heating the components to 200-300°F (93-149°C) or soaking them in a special scavenger solution can aid in disassembly. I’ve used it to retain cam gears on Cummins engines, and while it took effort, the components could still be separated when needed.
Loctite 609 Vs 601 – While 609 is sometimes considered an equivalent replacement for Loctite 601, there are some key differences. 609 has slightly greater gap filling capabilities compared to 601, making it more suitable for press-fitted applications where there may be minor gaps or looseness between components.
How Long Does It Take for Loctite 609 to Cure?
As is said in Loctite 609 retaining compound sds, Loctite 609 is Slower cure, 15% strength in 5 mins on steel.
Value for Money
Although it may seem a bit pricey, it worked wonders as a bearing retainer during a repair on my JD mower deck. I used it on both the top and bottom bearings, a total of six, and it saved me from having to buy new spindles. Initially, I considered using an old soda or pop can shim, but 680 was well worth the investment.
How to Remove a Screw With Loctite 609
Make sure you add lubrication to your threads to make them easier to remove later on.
I also used Loctite 680 to permanently connect the male and female threaded ends of my semi-automatic ha
Exceptional Quality
The exceptional quality of Loctite products is well-known, and Loctite 609 Retaining Compound is no exception. Its high-strength formula ensures long-lasting performance, making it a valuable addition to any workshop or DIY enthusiast’s toolbox. In fact, it has saved the day for me on multiple occasions.
❌May Not Bond Effectively With Rubber
Material Compatibility – Regarding material compatibility, 609 works exceptionally well with metal substrates, as it requires metal to initiate the curing process. However, it may not bond effectively with rubber or carbon fiber components.
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FAQ of Loctite 609
Q: Which Loctite product is recommended for securing a tapered roller bearing race with slight looseness?
A: Loctite 609 would be suitable for addressing your situation.
Q: Is there a risk of damaging carbon fiber with this product?
A: Carbon fiber is essentially carbon in its elemental state. It seems highly unlikely that it would cause damage, although it might not adhere well to it. It would be best to consult Loctite for a more definitive answer to your excellent question.
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My Hands-on Test of Loctite 680
✅Pros of Loctite 680: Alternative to Loctite 609
Firstly, I like Loctite 680’s versatility. From securing bearings in housings to locking down gears on shafts, this compound has proven its worth time and time again. And while it’s not recommended for certain applications like bike seat posts or stems (it’s a thread locker, not a glue), it excels at filling gaps up to 0.001 inches between components like bearing races and hubs.
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How to Apply Loctite 680
In terms of applications, I’ve successfully used Loctite 680 for securing M2 taper chucks and arbors, as well as locking down metal roof screws (although proper thread engagement is crucial for the latter). And for those working on AR-15 builds, while it can be used for barrel extensions, the more removable Loctite 620 may be a better option.
One aspect that sets Loctite 680 apart is its non-foaming formula. Unlike some other compounds, it dispenses as a thick liquid, ensuring precise application and minimizing any mess. And while the bottle may not be completely full when you receive it (the air space is necessary for proper curing), you can rest assured that you’re getting a quality product.
I had a situation where the oil seal failed and damaged the bearings inside my mower’s gearbox. During the reassembly of the new components, I used Loctite 680 to facilitate retention, It has been over a year now with several hundred hours of use, and I haven’t encountered any issues. It truly saved the day.
Curing Time
Now, let’s talk about curing time. While the fixture time is a relatively quick 10 minutes, I always give it a full 24 hours at room temperature to reach its maximum strength. And speaking of strength, this stuff is no joke. It forms an incredibly robust bond between materials like steel and bronze, making it perfect for securing components that experience high levels of vibration or torque.
❌Cons: Loctite 680
When paired with the appropriate primer, this adhesive forms a remarkably strong bond, especially for slip-fit applications. However, it’s important to note that it sets very quickly when used with the primer. So, plan on assembling the parts immediately once you’ve applied it.
If you’re searching for something that will securely lock two metal parts together for eternity, this is the stuff you need. But be prepared to work fast because this liquid adhesive sets up rapidly. I’ve used it with the primer, and it seems to start curing within 60 seconds or even less.
While I haven’t attempted to disassemble anything I’ve used it on yet, from what I’ve read online, it’s even more difficult to take things apart compared to red Loctite. I reserve the use of Loctite 680 over Loctite 271 
(red see loctite blue vs loctite red) only for situations where I never want to separate the two items, such as mounting studs forming part of an adapter or sleeves that will never need to be pressed out. I also find it particularly useful when inserting Time-sert threaded stainless steel inserts into aluminum.
💬 FAQ of Loctite 680 (Retaining Compound)
Q: Is the bottle completely filled or partially filled?
A: The bottle is only partially filled, leaving some air space. This is because Loctite products need to cure in the absence of air.
Q: Can this retaining compound prevent metal roof screws from backing out?
A: Unfortunately, I don’t believe this retaining compound is suitable for your needs. The lock is tight, threads on the bolt/but, and pressure are what create the bond. It only fills gaps of up to 0.015 inches, and it may be difficult to achieve such a small gap with sheet metal screws.
Q: Should I use this retaining compound for an AR-15 barrel extension to mate with the upper receiver, or stick with 620?
A: I recommend sticking with 620, as this retaining compound can be difficult to remove once the object is installed.
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:
Will Loctite 680 retaining compound provide a strong enough bond between a steel electric motor shaft and a bronze press-fit gear?
It is quite strong, but I cannot confirm its suitability for this specific application. I have only used it for a small mounted micrometer moved manually.