Waterproof threadlock ?

[Boo2]

Hi,

Is normal threadlock waterproof ? If not then can anyone tell me the name of a waterproof threadlock suitable for use on shackle pins in use in anchor rodes ?

Thanks,

Boo2

 

[Tranona]

Not sure you need to use threadlock for this. Wiring or cableties is adequate. However, loctite is used for threads on Volvo prop nuts and seems to work OK.

 

[emandvee44]

Waterproof Threadlock

View attachment 32145

This is what I use on all the underwater fastenings such as anode screws, propeller nut and locking nuts. Also on the anchor connector screw.
(I think this is the one Vyv recommends).
For shackles, monel seizing wire.

Cheers,

Michael.

 

[macd]

I'd echo Tranona's remarks, except to note that sometimes 'eared' shackles are sometimes prone to jamming in some bow rollers, in which case countersunk socket head shackle pins might be preferred. In this case I'd certainly use a locking compound, but preferably something stronger than the regular nut lock (blue, if Loctite). This page has more info: http://www.loctitesolutions.com/files/AN09/Threadlocking_Guide.pdf

To the best of my knowledge none of the common Loctite thread lock products are water soluble. Indeed, some are resistant to many solvents far more aggressive than water.

 

[cryan]

Threalock will work if you think its required. Pins on big ships are sealed with lead traditionally

 

[vyv_cox]

View attachment 32145

This is what I use on all the underwater fastenings such as anode screws, propeller nut and locking nuts. Also on the anchor connector screw.
(I think this is the one Vyv recommends).
For shackles, monel seizing wire.

Cheers,

Michael.

Yes, that's the one I tested and have now been using on countersunk screws on anchor shackles for several seasons. Never had one loosen.

Edit - sorry, eyesight let me down first time. The one I tested was 242, described as 'medium strength, general purpose'.

 

[oldbilbo]

Coincidentally I was in the Hamble branch of Aquafax - the marine stuff supplier to the trade - earlier today and their helpful young desk-jockey ( himself a sailor doing up a 'project' ) showed me this product, mentioning that rather a lot of boatbuilders seem now to be using it.

I'll come back and tell you if it works. If it doesn't, I'm sure the MAIB lot will let us - er, you - know!

(Probably melted toffee would be better than the PTFE tape I consistently mis-apply.....)


I've also had Hyalomar Blue recommended by their 'tech advice' bloke as quite suitable for the task of thread sealant in 'our' boaty applications. Yes, that's intended for face-to-face sealing and, yes, they have a dedicated product for threads - but the thrice the price.

 

[PabloPicasso]

I understood that blue thread lock was undo-able with a wrench applied, red needed heat also, and the epoxy type was impossible! All were resistant to water once cured.

 

[emandvee44]

From Loctite Website;

Loctite 242
Threadlocking - Medium strength, medium viscosity, general purpose threadlocker, Breakaway torque 11.5Nm

Loctite 243
Threadlocking - Suitable for all metal threaded assemblies, Breakaway torque 26Nm

So it seems they have similar uses, but the breakaway torque required is greater for the 243. I think that I can manage the 26Nm.

Cheers,

Michael.

 

[macd]

I understood that blue thread lock was undo-able with a wrench applied, red needed heat also, and the epoxy type was impossible! All were resistant to water once cured.

The effective torque necessary varies with fastener size but blue is easy to undo, red harder, green harder still. It was slightly easier to understand when, as well as the numbers, they were described as nutlock, studlock, etc. I prefer studlock in critical applications.

Oldbilbo's Clessetite, as I daresay he's aware, is not a threadlocking compound but a liquid substitute for PTFE tape (and very good it is, too).

 

[superheat6k]

243 is also mildly oil tolerant. We use it in my business for securing compressor big end bolts. If you want really high strength use 270. For thread sealing, rather than locking, then 577 is the stuff. Works with virtually any chemical compound, oil, fuel, gas.