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  #1  
Old 09-01-2013
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Watertight blind bolts?

I need to mount a couple of plates on my transom for my davits. One of them is in a REALLY inaccessible location from the inside.

Does anyone know of a blind bolt or anchoring system that:
1. Will be strong enough
2. Can be made watertight
3. Will not corrode?

I know - big ask.... Failing this I need to find a very small boat ferret.

Graham
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Old 09-01-2013
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Re: Watertight blind bolts?

there are SS toggle bolts
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Old 09-01-2013
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Re: Watertight blind bolts?

Thanks Denise,
I should have provided more info. This is a high shear load and toggle bolts can displace relatively easily in shear due to the oversized hole. I was wondering about putting a sleeve on the bolt to fill the void but I would prefer an engineered solution to my bodge....

Graham

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there are SS toggle bolts
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Old 09-03-2013
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Re: Watertight blind bolts?

Quote:
Originally Posted by GrahamO View Post
I need to mount a couple of plates on my transom for my davits. One of them is in a REALLY inaccessible location from the inside.

Does anyone know of a blind bolt or anchoring system that:
1. Will be strong enough
2. Can be made watertight
3. Will not corrode?

I know - big ask.... Failing this I need to find a very small boat ferret.

Graham
I have not seen that type of bolts, but I read about a neat trick somewhere.

The idea is to make a backing plate with integrated attachment's.
The author used a thin line attached to a threaded hole in the center of the plate and a extra hole in the boat to pull it into place.
When in place a countersunk screw where used to keep the backing plate in place during installation (and left there).

There are several ways you could do this, using the outside plate as template.

I have successfully glued large washers and nuts onto plywood with thickened epoxy, use bolts to keep the washer & nut in place and build up a large cone of epoxy around the nut/washer apply some grease to the bolt threads to avoid it getting stuck (or avoid putting epoxy over the threads .

You can also attache the bolts to the plate i a similar way.

If you prefer backing plate of metal you could weld the bolt / nut onto the plate or cut threads directly into the plate (you need some thickness in the plate to cut threads).
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Re: Watertight blind bolts?

Quote:
Originally Posted by GrahamO View Post
I need to mount a couple of plates on my transom for my davits. One of them is in a REALLY inaccessible location from the inside.

Does anyone know of a blind bolt or anchoring system that:
1. Will be strong enough
2. Can be made watertight
3. Will not corrode?

I know - big ask.... Failing this I need to find a very small boat ferret.

Graham
Add an access panel opposite the plate?
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Old 09-03-2013
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Re: Watertight blind bolts?

thanks K,
I actually have a metal backing plate and the idea of mounting the nuts to it is a really good one. I'm sure I can find a way of putting the plate on some kind of pole.

At the very least it will be much easier to find in the bilge when I drop it.......

Graham

Quote:
Originally Posted by knuterikt View Post
I have not seen that type of bolts, but I read about a neat trick somewhere.

The idea is to make a backing plate with integrated attachment's.
The author used a thin line attached to a threaded hole in the center of the plate and a extra hole in the boat to pull it into place.
When in place a countersunk screw where used to keep the backing plate in place during installation (and left there).

There are several ways you could do this, using the outside plate as template.

I have successfully glued large washers and nuts onto plywood with thickened epoxy, use bolts to keep the washer & nut in place and build up a large cone of epoxy around the nut/washer apply some grease to the bolt threads to avoid it getting stuck (or avoid putting epoxy over the threads .

You can also attache the bolts to the plate i a similar way.

If you prefer backing plate of metal you could weld the bolt / nut onto the plate or cut threads directly into the plate (you need some thickness in the plate to cut threads).
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Old 09-03-2013
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Re: Watertight blind bolts?

I wish.....
It is in the upper stbd corner of the transom behind the propane locker so the only options for an access panel are the transom, the deck or the hull. I'm not keen on any of those.

There is actually a fairly large volume on my boat under the propane locker that is entirely inaccessible without taking out either the steering gear or the engine - not good.

Graham

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Originally Posted by LinekinBayCD View Post
Add an access panel opposite the plate?
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Re: Watertight blind bolts?

Quote:
Originally Posted by GrahamO View Post
thanks K,
I actually have a metal backing plate and the idea of mounting the nuts to it is a really good one. I'm sure I can find a way of putting the plate on some kind of pole.

At the very least it will be much easier to find in the bilge when I drop it.......

Graham
Instead of using a pole you could thread a thin line through one hole front to back, diagonally across the back side of the plate and back to front.

use an fish tape to pull both ends of the line through the holes in the boat, and pull the plate into place.

When you have inserted the two bolts in the free holes you can just pull the line out and insert the two remaining bolts.
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Re: Watertight blind bolts?

Quote:
Originally Posted by GrahamO View Post
I wish.....
It is in the upper stbd corner of the transom behind the propane locker so the only options for an access panel are the transom, the deck or the hull.....
I'm sure we're not picturing the situation, but this begs why you can't put an access panel in the back of the propane locker.
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Old 09-03-2013
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Re: Watertight blind bolts?

you are picturing it fine. Isn't it illegal to put an access panel in a propane locker????

Graham

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Originally Posted by Minnewaska View Post
I'm sure we're not picturing the situation, but this begs why you can't put an access panel in the back of the propane locker.
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