Thread locking fluid - barrel retaining screws

[Gragson]

Cleaning up an SMK 19 springer. On reassembly wondering what to put on the threads to secure the barrel retaining screws though the stock to barrel threads.

Appears that the original screws had some lock fluid applied.
I've got Loctite 243 which is medium strength which I use on motorcycle switchgear fastening etc.
Is that ok or something weaker / stronger? Probably overthinking and it will be fine..

 

[Brooksy]

It'll be fine. The screws aren't subject to vibration anyway.

 

[chouchin66]

Cleaning up an SMK 19 springer. On reassembly wondering what to put on the threads to secure the barrel retaining screws though the stock to barrel threads.

Appears that the original screws had some lock fluid applied.
I've got Loctite 243 which is medium strength which I use on motorcycle switchgear fastening etc.
Is that ok or something weaker / stronger? Probably overthinking and it will be fine..

View attachment 841335

You're "on point". Proceed.

 

[Neil54]

If the screws loose whilst shooting, a little threadlock may be needed. Usually there's enough left on the old screws.
The screws are pretreated with a dry formula.

 

[Wing Commander]

Threadlock can be both a cure and a curse.
Yes, it will stop a screw from coming lose, but if the "juice" works too well, the screw will be a nightmare to remove in future.

For lightly stressed screws, smearing the thread with some PVA wood glue works well. . The screws stay secure but are relatively easier to unscrew if/when the time comes to undo them.

 

[Gragson]

You're "on point". Proceed.

Threadlock can be both a cure and a curse.
Yes, it will stop a screw from coming lose, but if the "juice" works too well, the screw will be a nightmare to remove in future.

For lightly stressed screws, smearing the thread with some PVA wood glue works well. . The screws stay secure but are relatively easier to unscrew if/when the time comes to undo them.

Cheers Gents, appreciated

The screws are pretty chunky with deep recessed PH2 drive heads, and were pretty stiff to take out even with perfect fit Wera drive bit, but didn't burr at all - surprisingly for the MIC!

I goggled the Loctite 243 datasheet and it should be ok, meant for disassembly with hand tools, but given the feedback I will only apply a tiny smidge to the thread

 

[Vic Flange]

As long as you use a thread locker and not a retaining compound you will be ok.
Retaining compound is meant to be not removed. It can be loosened with a LOT of heat but it is mega strong stuff. We did a test using Loctite 638 on an M8 hex bolt and nut. We put the nut in a vice the next day and when we tried to unscrew it, the bolt sheared.

 

[Philthunder]

Medium strength ie Blue threadlock, Loctite 242 or 243 upgraded version, should be more than enough. You don't want a retaining compound like Loctite 638 648

 

[Owain glyndwr]

Another method,plumbers ptft tape

 

[On_target]

I've never had any problems with removing screws fitted with blue thread lock.