What threadlock for "never, ever coming undone"??

[Kermit power]

Morning all,

I recently purchased a new kitchen sink and tap. It looks lovely, and is exactly what I wanted, but it has an issue...

The tap secures to the sink by way of a threaded bar that fixes into the bottom of the tap, with a bracket which slides over the bar and is pressed against the underside of the sink by a nut on the threaded bar.

The problem is that I just can't get the bloody threaded bar to stay secure in the tap, and it's driving me fking nuts, as getting access to the underside of the sink (by having to try and wriggle into a corner unit) is a contortionists nightmare!

I've tried using some purple Loctite threadlock I've got for my mountain bike, but that has failed miserably to do anything at all, so can someone please recommend a really strong bd threadlock and where to find it?

[Magic919]

Purple is weak, try red.

[DuraAce]

Loctite 270

[dave-the-diver]

Magic919 said:

Purple is weak, try red.

Nah.

Green.

270 Studlock.

Done right, it will meet the criteria in the title.

[motco]

[Kermit power]

motco said:

Sadly, it's the other end!

[WinstonWolf]

Just fit a second nut and lock it up against the first, job done

[Aggymon]

Superglue

[GriffG]

But if silicone mastic on the thread first

[Kermit power]

WinstonWolf said:

Just fit a second nut and lock it up against the first, job done

I tried that, but it's not the nut that's coming undone, it's the bar where it threads into the tap.

I'm going to go belt and braces, I think. Red loctite ordered, plus I'll also slap some mastic over the top once it's in, just to give it more resistance against vibrating loose...

[WinstonWolf]

Kermit power said:

WinstonWolf said:

Just fit a second nut and lock it up against the first, job done

I tried that, but it's not the nut that's coming undone, it's the bar where it threads into the tap.

I'm going to go belt and braces, I think. Red loctite ordered, plus I'll also slap some mastic over the top once it's in, just to give it more resistance against vibrating loose...

Been there, done that.

Put two locknuts on the threaded bar and lock them up together with about 10mm of thread showing. Use the locknuts to tighten the threaded bar into the tap. Undo locknuts, lock the tap in position, job done.

[ManicMunky]

If you're 100% sure it's never coming off.... two-part epoxy

[TooMany2cvs]

Nyloc? Shakeproof washer? MIG?

[eliot]

I suspect that the rod or brackets are bending and giving the impression that the nut is coming loose. Bed the tap into silicone sealant to fix it to the top and use the underside mountings to reinforce
And two nuts locked together as suggested- otherwise how will you get it of for repair?

[Kermit power]

eliot said:

And two nuts locked together as suggested- otherwise how will you get it of for repair?

I'll still be able to remove the tap by unscrewing the nut from the thread. Think of it like wheelnuts on a car. It's not the wheelnut that's coming lose, it's the stud, which is mounted into the tap. That's what I'm trying to fix permanently in place, as there's no need to ever remove it.

[The Moose]

Kermit power said:

as there's no need to ever remove it.

Famous last words

[BlackZeD]

He is trlling you to nip two nuts together to get a grip on the threaded bar.
Then use those to tighten the bar into the hole.
You could then run those down and lock the shaft with them.
Use loctite as well.

[del mar]

I could demonstrate my skill at cross threading bolts / nuts ?

Those buggers never want to come undone again !


if it keeps coming loose there may be a problem with the thread / nut.

Edited by del mar on Thursday 16th November 19:26

[marcjml]

Ptfe the threaded bar first

[dazwalsh]

marcjml said:

Ptfe the threaded bar first

This^ lots of PTFE