achjimmy Posted November 27, 2008 Share Posted November 27, 2008 I am getting tired of the self tapping screws not holding in my floor and was considering drilling the holes out and putting alloy rivnuts (nut that rivets itself in hole) in and using proper 3/16 unf screws to hold the floor down. Has anybody else done this. Only concern i can see is the risk of corrosion between the two disimalar alloys which will be less than the alloy and stainless currently. Link to comment Share on other sites More sharing options...
tan the fisherman Posted November 28, 2008 Share Posted November 28, 2008 what about tech screws? Link to comment Share on other sites More sharing options...
johnno Posted November 28, 2008 Share Posted November 28, 2008 I like your thinking But i wouldn,t trust the dissimilair metals all together with the nut sert Go the next size up in thread and cup washer Link to comment Share on other sites More sharing options...
numbnuts Posted November 30, 2008 Share Posted November 30, 2008 I had a similar problem on a previous boat.I fixed it by using loctite on the threads. May work for you. Link to comment Share on other sites More sharing options...
stevefish Posted November 30, 2008 Share Posted November 30, 2008 it used to piss me off so i gave up on them like most the floor in my tinny is shaped around the ribs, so the floor wont slide forward or back. the weight is still on the supports and with the esky and tackle it wont lift. so, do nothing and your laughing Link to comment Share on other sites More sharing options...
pelican Posted November 30, 2008 Share Posted November 30, 2008 Boats flex and will forever be gradually working on tightly screwed down floors. The other way rather than screwing through the floor boards is to screw a cleat of thick polly chopping baord into the rib above the floor. As the screws are not under load from people walking on the floor or flex of the hull they won't tear the threads out. Floor won't fall out if it goes over and you only have to remove the cleats on one side to lift up the floor. If you preferred you could just put Ramset plugs ( cap head ones like you use innconcrete walls into the existing holes and use existing screws but they may just spin when you go to undo them but worth a try. Link to comment Share on other sites More sharing options...
Dorado 2 Posted November 30, 2008 Share Posted November 30, 2008 (edited) Hi mate only last week I needed to remove part of the floor as the live bait tank pump siezed and I had the opposite problem, I could not get the screws out!! but a knock here and there and managed to remove them. When using alloy vibration is your worst enemy and perhaps that is why the screws are getting loose plus the fact also that alloy is a softer metal where the flooring sits on the ribbing you should have a rubber lining?? so that the plate does not move or vibrate. Numbnuts is more on the money, but in this case where they are really lose I would use a silican or rubber seal that when cured would have a rubbery texture and that would fix the problem for you and at least when you need to get the screws out you will be able too Cheers Edited November 30, 2008 by Dorado 2 Link to comment Share on other sites More sharing options...
jewgaffer Posted November 30, 2008 Share Posted November 30, 2008 Anyone thought about drilling holes and gluing in female thread inserts to match the screws or small diameter bolt threads. Cheers jewgaffer Link to comment Share on other sites More sharing options...
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