Locktite suggestion - what kind?

**ungawa** · November 7th, 2009, 06:10 PM

What kind of locktite won't vibrate out no matter what, won't need a blowtorch or solvent to break when the time comes, and won't cost more than $0.05?

I'm putting an ambi selector in a very heavy use AR and don't want it to come apart. Unless I say so.

Thanks!

**fingers80002** · November 7th, 2009, 06:12 PM

Blue if you can apply before assembly, green if you need to apply after assembly.

**P7hk9** · November 7th, 2009, 06:18 PM

I use Loctite 246. It holds tight under repeated uses, and doesn't require a blowtorch/sledge when the time comes to get the screw out. If you NEVER want the screw to come out, try 272. Takes a lot of effort to remove a screw if you use that.

Just make sure you use it according to the directions. Some of them won't cure well if there is oil on either of the threads.

**Pa. Patriot** · November 7th, 2009, 06:31 PM

Originally Posted by fingers80002

Blue if you can apply before assembly, green if you need to apply after assembly.

This ^^^^

Originally Posted by P7hk9

Just make sure you use it according to the directions. Some of them won't cure well if there is oil on either of the threads.

...and this ^^^^

**ungawa** · November 7th, 2009, 06:40 PM

Thanks guys!

**kadar** · November 7th, 2009, 07:04 PM

http://www.type2.com/library/chemicals/loctite.htm

**Enfielder** · November 7th, 2009, 07:55 PM

Read the data sheets as some Loctites are OK on regular steel but are not good on stainless (like 271 and 242, good on steel, but never get near full cure strength on stainless) At the moment I cannot recall the stainless Loctite, but seek and ye shall find.

At work we assemble our own designed medical equipment (at the heart of our machine is a 4800 rpm centrifuge) with Loctite 242 (blue) applied to degreased fasteners and threaded holes, shake well, apply a drop to the screw threads, then screw it in. For certain situtations we apply Loctite 425 after assembly (the term is "post applied") Both are medium strength, meaning they can be disassembled with hand tools w/o heat gun or solvents. The red Loctite 271 is "permanent"; a PITA to disassemble.