Loctite

J

JJR512

Joined
Feb 6, 2014
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176
I don't know much about Loctite, I don't believe I've ever had cause to buy or use any in the past. Now I have a need for some and I've been told to use "blue Loctite". A quick google search turned up "Loctite Threadlocker Blue 242" as a full product name. Is that the stuff I'm looking for if I've been told I need "blue Loctite"?
 
In depends on what you want to do in the future with what you're loctiting. I suggest you read on the Loctite's site what it would take to remove the loctite. I think both Blue and Red loctite require heat application in order to unloctite it (or strong enough torque). If you're going to use it to make a screw secure and it's just holding like a scale to the blade handle, for this purpose, I use Purple loctite. It won't unscrew by itself but I can still take it off easy enough without having to apply heat. This is what I use.

Some other things I've heard that work is grease on the threads (perhaps it's because you can torque it more securely) or those pipe thread tapes.
 
rycen said:
Moved to MT&E
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Apologies for posting in the wrong forum; however, it would be very helpful in the future if you leave a redirect when you move a thread to a different forum. I had a very hard time finding this thread since you didn't do that. It didn't turn up in the search results either for threads posted by me, or in the "what's new" page, probably because it all happened so quickly that the index hadn't been updated.
 
Living a redirect also takes up a space where a valid thread should be. All you have to do is click on your name and view forum posts.
 
Whitedog said:
242 is Blue. Doesn't take much.
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Thanks for the confirmation and tip.

Rey HRH said:
In depends on what you want to do in the future with what you're loctiting. I suggest you read on the Loctite's site what it would take to remove the loctite. I think both Blue and Red loctite require heat application in order to unloctite it (or strong enough torque). If you're going to use it to make a screw secure and it's just holding like a scale to the blade handle, for this purpose, I use Purple loctite. It won't unscrew by itself but I can still take it off easy enough without having to apply heat. This is what I use.

Some other things I've heard that work is grease on the threads (perhaps it's because you can torque it more securely) or those pipe thread tapes.
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The specific application is the pivot screw on an Emerson folding knife. I don't recall where exactly I saw the recommendation for blue Loctite. I may be mis-remembering something...
If you take your knife apart we do recommend that you use a small drop (the size of a pinhead) Low or Medium strength LocTite on the threads of the pivot screw.
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That is from Emerson's own website, and is next to a picture of someone holding an unlabeled bottle with a blue substance inside it.
IMG_4145-300x300.jpg


I think that your description of what you use purple for is what I would want, so I may go with that instead.
 
rycen said:
Living a redirect also takes up a space where a valid thread should be. All you have to do is click on your name and view forum posts.
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Other moderators leave redirects; there's one in that same forum right now, second non-stickied thread from the top when I looked a moment ago: "Moved: Recommendation? What kind of membership do I need?" But I guess we all need to be special in our own way and do things differently just to be different.

I would've thought that convenience for members was more important than saving imaginary space, but what do I know. I almost re-posted the thread since as far as I could tell, including by doing what you suggested, I was not able to find my thread anywhere, so I thought maybe I didn't actually click the "Post" button before leaving the page or something.
 
Rey HRH said:
In depends on what you want to do in the future with what you're loctiting. I suggest you read on the Loctite's site what it would take to remove the loctite. I think both Blue and Red loctite require heat application in order to unloctite it (or strong enough torque).
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After my earlier reply I did do as you suggested and checked their website. For Blue 242, they describe "medium strength" as a feature and list a benefit of that feature as "Can be removed with hand tools". But I'll look into purple as well. Thanks for the tip!
 
spketch said:
Blue does not require heat or excessive torque to remove. You want either that or purple. Blue is easier for me to find locally so thats what I use. Clean the screw threads then apply a tiny bit of loctite to the screw. It takes a while to set so you'll have time to find the sweet spot on the pivot.

http://us.henkel-adhesives-blog.com...ween-Red-Blue-Green-and-Purple-Threadlockers/
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I understand what you mean about blue being easier to find. I know my local Walmart carries Blue 242. I can't even find purple on Loctite's own website. On Google I found that Amazon carries "Threadlocker 222", which is purple and "low strength". But the threadlocker section of Loctite's own website only has blue and red, no other colors, and I was not able to find purple on their site search, either. I'll check out your link though.
 
Blue is what I use. If you see Blue Permatex instead of Loctite, fear not as they are essentially the same.
 
The last time I bought purple loctite I got it from a hobby shop, try there if you have one locally.
 
Blue is by far the most common, probably because it works well enough by all means. Just a bit will do.
 
I would agree now that Blue Loctite will work as well. When I clicked on the link provided by spketch, i see what they say but it wasn't what I remembered. So I went to the 'official" loctite site http://www.loctiteproducts.com/p/t_lkr_blue/directions/Loctite-Threadlocker-Blue-242.htm.

It does support what I said previously: "For disassembly, shear with standard hand tools and remove with methylene chloride. In rare instances where hand tools do not work because of excessive engagement length, apply localized heat to nut or bolt to approximately 482°F (250°C). Disassemble while hot." But I don't think you'll have the issue of excessive engagement length. I had to buy my purple loctite by mail with shipping charges. Next time, I'll just go with Blue loctite also.

Thanks for your link spketch. I learned something and I'll save money in the future.
 
When I disassemble something that had blue loctite applied, will I need to remove the leftover old loctite before reassembly, and apply a new dab of loctite? What is this "methylene chloride" stuff, is there a commonly available product with that stuff in it?
 
JJR512 said:
When I disassemble something that had blue loctite applied, will I need to remove the leftover old loctite before reassembly, and apply a new dab of loctite? What is this "methylene chloride" stuff, is there a commonly available product with that stuff in it?
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If there's just a little blue dab of thread locker on the screw from the factory, you can apply the new stuff over it with no problems. If you need to take it apart again for some reason and need to reapply new Loctite a second time, that's when you want to clean everything off and start fresh, just so you don't start getting a lot of buildup. I've successfully cleaned threads of old Loctite with lighter fluid and a steel wire brush (toothbrush size) that I got at the hardware store. Plunk the screw down into a little bit of fluid and let it soak for a while first. This will soften up the old Loctite. It also helps to put the tip of your Torx driver into the screw head while you're scrubbing the threads so you can hold onto it. It's pretty much impossible to do without this step. Just sort of hold the screw onto the end of the driver firmly with your fingertip and lightly scrub till clean. :thumbup:
 
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