I have worked in machine shops for a good part of my younger adult days. I would use blue. The red would be too tough to get the small screw back out if the need ever arose. Both will stand up to the heat, so that wouldn't be an issue.

 

"Red" is stronger. By that I mean, once applied it is very difficult to back out the screw you applied it to. Blue works well if you have a screw or bolt that is backing out because of vibration or similar external or internal forces. It is by no means a permanent as Red. If you ever want to relatively easily remove what ever it is you applied the Loctite to my advice is to use blue. Once the red has set up it is not going to let go. Also, keep all that kind of stuff in the refrigerator and it will last for years.

 

I use blue on my holster screws once I get the holster adjusted to where I like it.

 

Loctite's website says that their thread lockers aren't recommended for use on plastic. A small dab of RTV silicone caulking will hold the sight screw until you want to remove it.

 

I used RED on the front sight screw because blue loosened up. The front sight screw is so small, very little loctite actually contacts it, so hopefully I can break it loose with my Lone Wolff front sight tool. If not, I will just break it off, since my Warren sight set comes with a front sight screw, which is shorter than the Glock standard one.

 

I NEVER use the red for anything in firearms. Blue and sometimes purple are the recommended choices for gunsmith type work. Personally I use blue for front sight change out with the proper tools, and tightening to the correct inch/pounds ensures it is not coming lose. If I am mounting a scope for a customer I always clean the holes with a drop of Chemtool B-12 on the end of a toothpick so not to expose the cleaner to the bluing and then wick it back out od the hole. This is followed by using blue Loctite and tightening the screws to the proper torque. Even the "Big Boy" guns won't make the screws loosen. My experience may be different from others so I will just say this has worked for me thus far.

 

Personally I use blue for front sight change out with the proper tools, and tightening to the correct inch/pounds ensures it is not coming lose.

Sounds like a nice precise way to install your sight. How do you measure the torque and what is the proper amount?

I used blue on my front sight, and tightened it only with as much strength as I had to turn the front sight tool with my thumb and finger.

Great suggestion. I'll go by your method unless there's a real way to measure screw tightness.

OK, had another thought. Anyone use loctite when you install the rear sight? Just thought I'd ask.

 

...Anyone use it on their front sight screw or any other firearm parts? Red, blue or some other color? Red sounds pretty tough to un-do. ...

For sights with steel mounting parts (not plastic, as DocDorle noted), Dave Dawson of Dawson Precision (makers of sights, among other things) recommends Loctite 262 (red "threadlocker") for the rear sight, and Loctite 620 (green "retaining compound") for the front sight.

You can buy this stuff from Dawson: https://www.dawsonprecision.com/ProductDetail.jsp?LISTID=80000EDE-1300732007

Just using the terms "red" or "blue" to distinguish the Loctite products is not going to be sufficient these days, things have gotten complicated. I counted nine different types of "red threadlocker" on the first page of a search of the site, and nine different types of "blue threadlocker" before I stopped looking.

The website is: Adhesives, Sealants & Surface Treatments - Henkel North America

I quickly got lost in the website research, so I just use Dave's recommendations, with very good results. Recently I had to change a set of sights that I had mounted using the 262/620 combination, and found that while both screws could be removed, it was only with considerable pressure. Those sights were definitely NOT going to move by themselves.

The Loctite that remained in the parts looks like a whitish, thick, dry, paste. I was able to clean it off using a cyanoacrylate remover product called "Un Cure" that can be found at hobby stores. I've also used acetone to remove Loctite.

That, and a steel brush.

Chris

 

I use RED on my GLOCK front sights all the time. I have used BLUE before but it didn't hold well.

I have no issues removing the front sight screw after using RED. I do it all the time as I like to play musical sights.

 

I also used red on my front sight no issues.

 

Never had a problem with blue.

 

Blue and don't look back.

 

I used blue on my front sight, and tightened it only with as much strength as I had to turn the front sight tool with my thumb and forefinger.

I degreased the sight and screw with rubbing alcohol, then dried them. Then I applied a tiny amount of blue loctite to the threads of the screw, and installed the sight. I let the loctite set for 24 hours before applying oil anywhere near the front sight, and 48 hours(overly cautious) before shooting with it.

 

Here is Locktite's website with the msds, question and answer sections, and recomendations for use http://useloctite.com/products/index.html I have also always used blue locktite for this type of use as well. I hope this helps and happy shooting

 

I suppose if you don't shoot high round count blue prob won't ever come loose. I've seen more than one front sight come loose though so take my advice for what it's worth. I subscribe to the "better safe than sorry" school of though though. Considering the RED isn't a problem to remove with a proper sight tool I can't imagine using anything less.

 

The Glock armer that put my and my son in laws truglo sites on didn't use any locktite he said he has never had any issues not using any. I bought the front site tool just in case!

 

Check it frequently to make sure it hasn't loosened up. The problem is you usually don't know it until your front sight has gone missing.

 

That's why I bought the site tool I don't trust it. I may just locktite it my self.

 

No one uses green? It's made by Loctite and even called guntite...

I use green Loctite on my front sights and have never had one come loose... I also use it on rear sights if they have a set screw... I have removed a couple of front sights that I put on with green loctite and they came off without too much trouble...

 

I am going to loctite my front site today. I put a tritium site on my LCR and the loctite can only go under the site, is it the same on the Glock or does some go on the screw only like in any other application?

 

I only put a small amount on the screw threads.

 

Whatever loctite you use, try to keep it off the the very tip of the front sight screw. It will swell as it cures and it could break a Tritium vial or fibre rod....

 

I'm still waiting for my son in law to get here so I can do it. I gave him my Glock site tool to keep in his Duty bag.

I've been having Glock with drawls. Do to having to go to the hospital for the last two weekends to do visits to my sister in law I've been carrying my LCR on my ankle. Its hot her room, so even a cover vest is to hot to ware. And its not that easy to get my ass and the gun on my side to fit in some of those narrow chairs that are out there in the world. So today I stayed home, I had to put my Glock on to get my fix!

 

I'm glad this post got started, mine was tight but my son in laws would have come off after a few more rounds. And, it's impossible not to get loctite on the end of that tiny screw, it's as short as the drop of locktite!!!!

 

When I am working on small parts like that, I will dip a toothpick in the loctite and then apply it to the part a little at the time. It works much better than applying it straight from the tube.

 

Good to know, but sense my sites are not the tfo I was't worried about the risk of swell. I have the truglo night sites and the tritium is a log way from the screw. And even if I had the tfo I can't see swell an issue.

 

I also used red loctite on my rear site as I had dremmeled too much material off of it. I took enough material off that I could place the rear site with finger pressure only, but still with some resistance. It has been over 2,000 rounds and the rear site is not going enywhere.

 

I've tried using the blue on my M23, but it kept coming loose. So I think I'll try using the red.