Locktite not Locktiting!

PoFF

PoFF

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I've been trying to install an ARMS #18 mount on my Nork M14S with very little success so far. Even with strong tightening, the main bolt somehow always manage to loosen and the hole scope/mount assemble is moving after a few shots.

I tought locktiting the main bolt and all screws would solve the problem, but even after cleaning the reciever, screws, bolts and mount with brake cleaner to get the oil & grease out, the locktite doesn't seem to grip at all, even after a couple of days of cure. My stuff is genuine Blue Locktite brand (not the Permatex brand they're selling at CT). The tube is a couple of years old (3-4 years), would it be too old, hence the failure to grip?
 
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I don't think loctite goes bad with age... I have some 35 years old that is working fine... possibly blow the brake cleaner out with an air hose and let it dry 10 minutes before introducing the loctite... too much loctite might also be a problem...
 
You can get a cleaner/primer specifically for loctite, comes in a little spray can, works real good. I always used that or brake cleaner, both worked fine.

Drew
 
Loc-tite can go off if stored at too high a temperature, or extreme temp. variations. For what the little bottles cost, buy a new one, degrease with acetone or alcohol, and don't over torque the mount, the last thing you want to do is strip out the hole in your reciever.
 
Give E.B. Peerless a call in Mississauga 905-362-1151. Ask for Eamonn. He's the branch manager, and a Loctite technical salesman. Tell him Duncan sent you. IIRC, regular over-the-counter Loctite products have a 24month shelf life fresh from the factory, as far as aerospace is concerned. For industrial customers, Loctite has indeed advised a basically indefinite shelf life.
 
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PoFF said:
My stuff is genuine Blue Locktite brand (not the Permatex brand they're selling at CT). The tube is a couple of years old (3-4 years), would it be too old, hence the failure to grip?
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You do know that Permatex is the company also makes Devcon products. Moreover, I think Permatex bought Loctite.... no?

Apart from all the other suggestions about cleaning the holes and asking about what oil or protectant you use....here is a silly question but as obvious as it is, some people just don't think to do it.....did you shake the tube before applying?
 
Winz said:
You do know that Permatex is the company also makes Devcon products. Moreover, I think Permatex bought Loctite.... no?

Apart from all the other suggestions about cleaning the holes and asking about what oil or protectant you use....here is a silly question but as obvious as it is, some people just don't think to do it.....did you shake the tube before applying?
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Yes they did, and good point! Shake it up, it should be blue and sort of milky looking not blue and clear....
 
mercuryv8 said:
If He is having a problem ..red loctite maybe the solution. One person suggested that the problem may be too much locktite...I would folow this lead, try putting just a drop.

Nic
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+1 a bit of red would work - but you will have to apply a fair bit of heat to your screwdriver or allen wrench to get it off afterwards. better to use the blue.
 
PoFF said:
Even with strong tightening, the main bolt somehow always manage to loosen and the hole scope/mount assemble is moving after a few shots.
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Your problem is loss of friction on the screw threads itself. You need to establish it again throughout the whole length of the screw, not just on the had of the screw.

Stop reading labels on products and apply logic. Or simply use another smaller screw to lock main bolt screw.
 
SIGP2101 said:
Your problem is loss of friction on the screw threads itself. You need to establish it again throughout the whole length of the screw, not just on the had of the screw.

Stop reading labels on products and apply logic. Or simply use another smaller screw to lock main bolt screw.
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What are you talking about?

Apply logic?

Establishing 'friction' on just the 'head' of the screw? The action of the head tightening into a solid surface essentially stretches the threads, which creates friction and hold the screw down. Loctite is essentially a 'glue' that prevents the threads from 'losing friction' (as you put it), and therefore holds the screw in place.

Any your suggestion of 'simply use another smaller screw to lock main bolt screw' doesn't make any sense. At all. Are you talking about a set screw? How would that work?
 
canucklehead said:
What are you talking about?

Apply logic?

Establishing 'friction' on just the 'head' of the screw?
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What are YOU talking about???????
canucklehead said:
Are you talking about a set screw? How would that work?
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NO, well sort of. What I meant is to use smaller screw that immobilizes the head of main screw from rotating by installing it so close to the edge of head of main bolt screw. Head or a shaft of smaller screw is embedded into the head of the larger screw. Imagine two screws big and small one side by side. Head of the smaller one is protruding into the head of bigger one. Like it was done for centuries on various types of arms. Off course this would require milling number of small slots in main screw head. Or just one slot but right one.

Obviously something is wrong here, either wrong screw itself, worn threads or else. It is just my best guess since haven’t been able to se problem first hand. We just spiting out suggestions here, not picking up the fight, right?
 
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