Loctite 635 Vs Permatex 64000: What’s The Difference?
Loctite 635 is tough to beat for strength. Even when it’s hot, this stuff holds up. However, if you have some wiggle room in your slip fits, Permatex 64000 will fill gaps like a champ. I put it on loose sleeve bearings that were clacking like my grandpa’s knee, and it calmed them down.
- Loctite 635 Vs Permatex 64000: Specs & Uses
- My Hands-on Test of Loctite 635
- My Hands-on Test of Permatex 64000
Loctite 635 Vs Permatex 64000: Specs & Uses
⏰Drying Time
Loctite 635: Full cure in 24 hrs
Permatex 64000: Full cure in 24 hrs
🆚Temp Resistance
Loctite 635: Up to 180°C
Permatex 64000: Up to 400°F
🛠️Common Uses
Loctite 635 works well for securing bearings in airsoft replica gearboxes; holds pinion gears securely on motor shafts, even for heavy RC cars (e.g., 31 lbs); ensures a tight fit for slipping seals.
Permatex 64000 is suitable for securing a brass fuel spigot into an aluminum carburetor body; hold a bearing sleeve in place on a crankshaft.
Technical Info
My Hands-on Test of Loctite 635
✅Pros
I didn’t have any trouble applying it. You just have to make sure it doesn’t get inside the bearings, as that could cause problems.
Effectiveness
As for the effectiveness of the Loctite, it worked exactly as described, which I’ve come to expect from Loctite 635. I have used it and 638 (see it in my article how strong is loctite 638) for various projects in the past, and it has always delivered reliable results. It provided excellent adhesion for mechanical applications, and I had no complaints about its performance.
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Reliability
In my 31 lb RC car, I used Loctite to keep a pinion gear on the motor shaft. Even with all the weight and stress the car puts on the gear, Loctite held up pretty well. The results were good and I felt confident in its reliability.
RV Construction
Another positive experience I had with the 635 was to use it and 3M 4200 for an RV construction project.
3M 4200 Vs. 5200: Sanded Caulking, Best Below-Waterline, Roof Sealing and RV Maintenance
The manual specifically recommended this product, and it proved to be perfect for the job. The adhesion was excellent, and the bottle size was generous, ensuring it would last a long time. Read more: 3M 4200 Vs. 5200
I was more than happy with the results, and we received the product promptly from a responsive vendor.
❌Cons
I used Loctite for most of my applications, but there was one time it didn’t work. I tried Loctite to fix a slipping seal, but it didn’t fix the underlying problem. In that regard, it held up great, and I appreciated its reliability.
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My Hands-on Test of Permatex 64000
First of all, I used it to secure a hub to a 10 hp 2 cycle engine, and so far it’s holding up great. I think the bond is very strong and durable. It also worked on anodized aluminum.
✅Pros of Permatex 64000
Though I didn’t use it on helicoils (who knew? ), I did use it on yoke splines on a transfer case. It worked great for preventing gear oil from leaking past the splines, but I wouldn’t recommend it for anything you’ll have to disassemble later.
I believe this Permatex 64000 is very similar to Loctite 648. I think it’s Permatex’s version of the popular threadlocker.
Loctite 638 vs. 648: Secure Machine Parts, Repair Metal Structures & Assemble Metal Components
I used it to stop a metal oil seal from rotating inside a cylindrical hole. The 64000 stopped the seal moving side-to-side, though it may not work on every side-to-side seal.
I wouldn’t recommend using it to hold CD sleeves in or insert spark plugs, since those aren’t its intended uses.
It’s important to prep properly – I cleaned off any oil or grease before applying. Although it seems very similar to Loctite 620 (which I’ve also used with success), the 64000 is usually a little cheaper.
In terms of chemical resistance, I’m not sure if it can handle direct gasoline exposure. Gasoline isn’t specifically mentioned in the instructions, so I’d be cautious until Permatex confirms it.
Reviews said it kept bearing sleeves on crankshafts. Even though it’s a permanent retainer, you can remove bearing buddies by heating the hub area over 400°F.
❌Cons of Permatex 64000
I don’t think it works well for threaded studs with poor threads. It’s better to replace the stud than try a Hail Mary with this retainer.
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!
If I use the 64000 variant to install bearing buddies, will I be able to remove them in the future?
The temperature range for 64000 is up to 400°F (204°C), so you can remove the bearing buddies at a later date. However, you may need to heat the hub above 400°F using a heat gun. It's a common procedure for bearings and hubs, and heating up to 500°F won't harm the hub.