I am trying to figure out what kind of scew or bolt to use on putting some boat seats on a fiberglass boat

Question

I can not go under the seat to put a nut on since they are enclosed so I need to find the right ting so they do not pull out

Answer 1

If your trying to install a pedestal -you can use lag bolts to the floor with a pilot hole and epoxy.(assuming you have a real solid floor.) Dip the lag in the epoxy and tighten them all up in a cross pattern till they start to crack. If you have lay back seats, they can be screwed to the deck with long stainless wood screws and washers. Use plenty. If you are putting in a tall captains chair on a pedestal you must get under the deck and put in supports and bolts. After all you don't want to lose the captain just when you need em most.

Answer 2

As jtexas said, we need more info to give decent advice.

Answer 3

This depends on the type of seat and the mounting hardware available for fastening it to the floor.  You need to provide the brand of the boat seats, the model type, and a description of the mounting brackets for installation.

If you are referring to generic swivel mounted fishing boat seats, then you probably will probably have to buy a swivel base of the proper height and type.

However, if this is regular pleasure boat seats, it depends on the hardware mounting system.  When I replaced my boat seats with some new Wise lounge and jump seats, the mounting choices I had was almost zero.

So I bought piano hinges for my jump seats and bought a 4 to 6 foot aluminum L beam.  The piano hinge was cut up and worked to allow both jump seats to raise and lower.

For the lounge seats, the L beam was custom cut into 2 inch segments with measured mounting holes drilled in the custom L brackets to bolt to the inside brace supports of the lounge seats.  This way I could completely avoid having to take the mounting screws in the boat floor and reseal them when I put the seat back.  It was a real pain in the neck, but I'm definitely glad I did this instead of directly s******g the seats to the boat floor.

As with putting ANY s***w into the fiberglassed floor, after you have fully secured the s***w to the floor, back it out, fill the hole with proper marine sealant, then reinstall s***w.

I wish Wise boat seats provided some more helpful mounting choices than what was given.

Answer 4

What exactly are you s******g or bolting into?  a glass-over-wood floor or deck?

What kind of seat?  

Can you use a pedestal or swivel bracket?

Answer 5

what kind of seat, riding or fishing????

Answer 6

you need to drill and thread a hole then use a bolt that will work. try again to get under. there is always a way.