Bolts to tack down seats into fibreglass bottom ?

[nousername]

I have removed the interior of my 4m rib. I am building a console and making new seat positions to make the boat more spacious for both modernistic reasons and for when fishing.
Two of the seats and the centre console require bolting through the floor before getting covered in fiberglass for extra sturdiness, what bolts or screws should I be buying ?

Links would make life easier for me.

It came with normal threaded bolts and a glue like substance from avon.
I would have thought a small thread, enlarging to a solid 10mm stem before the head would be best, maybe even something along the lines of a Hilti bolt....
Boat has a double hull so I can't gain access to the underside of my skin.
Obviously I have no idea so looking for some advice from the people in the know,

Thanks

[GuyC]

I think if I was going to fibreglass them down for extra sturdiness, I wouldn't bolt / screw them down and would glue them down instead.

[Sandman]

This sounds like an interesting project. Do you have any photos showing progress or a sketch of your plans?

[gtflash]

My suspension seats are on a foam cored deck. I used these under the deck and epoxied in place. It was an absolute pain as any irregularity in the underside skewed the fixings location and angle and depth.

A male version would have been slightly easier.
https://shop4fasteners.co.uk/fastene...m-sighted.html

Do you have a ply deck? I had A recent conversation with an ex boatbuilder for a large UK rib company. He said they would use self tappers on consoles and drill and overfill with epoxy on 4 or 6 of the fixings but not all of them.

If you can avoid glassing it down you have less Agro of moving things should situations change.

Another option for no rear access although I haven’t used them.
https://www.amazon.com/Garelick-Eez-...J2BS2R27B7YT61

[kalin]

I use this to attach consoles and seats to the hull of new ribs.

https://shop4fasteners.co.uk/catalog...category/4056/

[gtflash]

Originally Posted by kalin

I use this to attach consoles and seats to the hull of new ribs.

https://shop4fasteners.co.uk/catalog...category/4056/

[Maximus]

If you want to do the job properly ....glass them in ...properly!

[Pete7]

Having taken a seat unit out that needed a crow bar, an angle grinder plus lots of violence, I can state that a tube of sikaflex is very good at making things stay put. Most consoles are held down with lots of self tappers and glue.

Pete

[nousername]

Originally Posted by Sandman

This sounds like an interesting project. Do you have any photos showing progress or a sketch of your plans?

It isn't as exciting as it sounds. The boat had no room for fishing. It had 20% covered at the front, dash, 6 seats and a battery next to the engine.
All I am doing is making a console and putting a long seat in the motorbike position. I then made a 2 man seat next to the engine that also opens up for storage and the fuel tank.
Then painting the tubes, interior and exterior.

If l let my ideas get out of control i'll end up with little to no room again so just using ideas from other ribs and bringing it together.

[nousername]

Originally Posted by kalin

I use this to attach consoles and seats to the hull of new ribs.

https://shop4fasteners.co.uk/catalog...category/4056/

Excellent, just what I was hoping to come across with the original post, Thankyou!!!

[kalin]

Originally Posted by nousername

Excellent, just what I was hoping to come across with the original post, Thankyou!!!

Will upload some photos this days how its look after mount

[diver 1]

As Kalin said, these are great, I used M10 with the fail safe that should one ever fail I can always increase the hole size to M12. Once you drill the fixing holes I seal the hole thoroughly with sikaflex before screwing the insert in.

https://www.ebay.co.uk/itm/Blind-Sel...Ij9z69fo65DapA

[gtflash]

Originally Posted by diver 1

As Kalin said, these are great, I used M10 with the fail safe that should one ever fail I can always increase the hole size to M12. Once you drill the fixing holes I seal the hole thoroughly with sikaflex before screwing the insert in.

https://www.ebay.co.uk/itm/Blind-Sel...Ij9z69fo65DapA

What sort of deck are you screwing those into?

[kalin]

Originally Posted by gtflash

What sort of deck are you screwing those into?

Any kind except very soft decks. Be careful with hole size. Depends from deck material. If you have any option to test/try somewhere with same material to check drilling size. I drill 10mm

[kalin]

Some photos for console mount with this inserts.
The 4 studs are only for guiding . After that i remove them and bolt with 8mm.
https://photos.app.goo.gl/cFCJL6JH9dvDB5hb6