Loctite 22221 Threadlocker 222MS, Purple, 10mL Volume

Have only used to secure 1 optic at this time. So far, so good.

This is for very small screws. It's just to keep things from coming disassembled. If you need small screws to be held in place under heavy vibration or stress, I'd suggest the Loctite Blue 242 instead.

I got this because a screw kept coming loose on a pair of eyeglasses (would have to tighten it every 3-4 days). I put this stuff on last and haven't had to tighten the screw since. Be careful when you first open it. You have to poke a hole in the dropper, and when I did, the pressure difference made the purple stuff spurt out. Fortunately, it didn't get on clothes or walls, just hands.

I know that red Loctite is permanent and blue is not What I needed was something for the little bitty screws that attach mods to the cams of my compound bows. When I asked for advice on what color of Loctitie to use on those little bitty screws, every one said to get the purple because it is best for tiny screws and is not permanent. So, that's how I use it and am happy with the result.

This is "just strong enough" threadlocker, such that screws won't back themselves out, but it's so easy to break the seal that it's hard to tell from simply a very tight screw. Like all loctite products, you get exactly what they say, and if you pick the right stuff, exactly what you need. It's a shame it costs what it does though. The glues, though outstanding, have a pretty terrible shelf life once you've opened the bottle. I suspect that will be the same case here, and the next time I need to lock down some screws the liquid won't be liquid anymore.

Good for keeping screws in and nuts on bolts. Put it on the threads of the screw and wait the full 24 hours to be sure it's set. Been using their stuff for many years. Make sure you get the right strength for the size of your screws. - Low strength (this item) - purple/loctite 222 (liquid) is for up to 1/4" screws Med strength - blue/loctite 243 (liquid) & 248 (stick) is for 1/4" to 3/4" screws High strength - red/loctite 263 (liquid) is for up to 1" screws Purple you can take the screw back out with just a hand tool. Blue you may need some sort of leverage. Red you'll want to heat up a little bit before trying to remove the screw. Stay within the manufacturer's suggested strength for your screw size to avoid risking stripping/damage. I've stripped a few screws in the past thinking that it would be fine, but the screws were softer than I expected. Not worth the risk/headache. Using one too weak and you'll risk it not holding well enough.

I think I've started putting this stuff on every bolt and nut on my automobiles. It does exactly what you need! On the bigger stuff I obviously use blue but for everything else... head bolts, manifold bolts, anything you want to get a proper torque on and have the peace of mind knowing there's an extra level of security on your fasteners... this stuff.

Nothing much to say about this, it is Loctite, so a brief of what I use it for: I use the Purple 222MS to secure grip screws, sight set screws and those few Harley bolts that I remove often. The purple holds against vibration, but is easy to break loose with a little torque. I use the 243 blue to secure bolts on my Harley that I may need/want to remove later, and to secure grip nuts on my pistols. These are not things that I plan to remove anytime soon, and want to make sure they stay put until I may need to remove them. When I need to make sure something does not move at all, I use Loctite Red 262. This takes a lot of torque and heat to remove. Do NOT use this until you know how strong it is and you know how to remove it. Do NOT use this on any screw you want to remove.