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Red, Blue or no Loctite

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REConley
Jon Eulette
Wobbley
Willfish30
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Red, Blue or no Loctite Empty Red, Blue or no Loctite

Post by Willfish30 8/4/2021, 1:03 am

I have a Rock River Wadcutter with the all steel Bullseye Rib. I find that it is too heavy for me with a red dot so I am replacing it with their all aluminum scope rail. Was told to use heat to loosen the rib screws because red Loctite was used. Before applying heat I tried to back them out with a regular 7/64" hex wrench and they all came out without too much effort.

So the question is, should I use red or blue Loctite or just torque the screws down with 20 inch pds on the new rib and be done with it?

Please advise.

Will

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Red, Blue or no Loctite Empty Re: Red, Blue or no Loctite

Post by Wobbley 8/4/2021, 1:13 am

In my engineering days, we seldom installed threaded fasteners with any form of thread sealant like”Loctite”.  In a gun screw, the thread engagement is a lot less than what we were working with.  So use either and be sparing with applied torque.  20 inch pounds is about the limit for #6 screws.
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Post by Jon Eulette 8/4/2021, 2:28 am

In my experience no blue Loctite equals loose rail at some point. I temporarily mount rails on pistols I build and they do come loose sometimes when using nothing. 
Jon
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Post by REConley 8/4/2021, 6:51 am

I use blue loctite and torque to spec. I also yearly retorque all of my sight screws.
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Post by BE Mike 8/4/2021, 8:05 am

Blue LocTite has always worked well for me for all scope mountings and grip screws. Screws only loosen during matches!Laughing
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Post by Gary Collette 8/4/2021, 9:03 am

I'm not sure that re-torqueing is a good idea.
Once the correct amount of torque is applied to a screw with the thread locker applied the 
only way to re-torque would be to over torque and break the seal the thread locker creates.
This is just my thoughts.

G
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Post by Wobbley 8/4/2021, 10:35 am

Gary, you are correct.  The only way to retorque a fastener is to loosen the fastener fully then retorque it from scratch.  Then you get into limits of the number of times you can torque a fastener.  Like most things “if it ain’t broke, don’t fix it”.
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Post by Willfish30 8/4/2021, 12:35 pm

Thank you all for your input. Based on your suggestions, I guess blue Loctite and torquing to spec should do it.

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Post by -TT- 8/4/2021, 5:13 pm

Be careful though, torque specs are almost always for dry fasteners. Loctite, antiseize or oil can easily lead to overtorquing. Stay on the light side when loctiting.

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Post by WesG 8/4/2021, 6:35 pm

If I'm worried about a mount coming loose, like a slide mount on a 1911 for sure, I'll use a high strength Loctite under the base, and a weak version on the screws. The screws can be removed easily, and the base will come off without much trouble either. Be forewarned however, the Loctite will leave a coat of goop on the slide that can be a problem to remove if you have intent to put it back to pristine condition.

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