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Old 08-08-2010
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However, the togglers will spread the load out over a greater area of the cabintop or deck and IMHO are better suited for higher load applications than Rivnuts.

Originally Posted by GaryHLucas View Post
You can get those togglers in stainless, I was surprised to see them in West Marine! However my choice would be to use a RivNut. A Rivnut works like a pop rivet. It has a head on it and internal threads. You use a threaded mandrel with an inexpensive tool that you tighten up to expand the back end of the rivnut. Then you unthread the mandrel and put your bolt it. Rivnuts work very well in fiberglass. If it ever gets damaged you use the same size drill to drill through it, and just install a new one. McMaster Carr among others sell them.

For lighter loads than a cleat I also recommend SwellNuts. Similar to a RivNut but made from rubber with a brass insert. They seal completely and won't crack the fiberglass, tolerate lots of vibration, and can be replaced at any time. Great for fastening interior hardware to fiberglass liners inside the boat, especially if foam filled.

Gary H. Lucas

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Old 08-09-2010
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Sorry if this is a hijack, but I have two questions about rivet nuts.

First, does anyone make them in stainless? I was just looking all over and can only find them in steel and one type in rubber.

Second, for them to work properly, does the surface of the hardware being mounted need to be in contact with the outter surface of the rivnut? I am thinking of mounting a Harkin cam cleat with a riser, for example. The riser is hollow, meaning the bolts come through the cleat and down through the riser, into the surface being mounted to. There would be no pressure on the outter surface of the rivnut.

I realize toggles might be a better choice here, since they would be pulled snugly against the back of the mounting surface, but I can't find togles in 10-24, which is the size the bolts must be to mount the Harkin cam cleat. :-(

OOPS - I found the stainless ones. Way too early for me to be posting...
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Last edited by jarcher; 08-09-2010 at 04:30 AM.
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