matty h
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| posted on 1/9/14 at 08:40 PM |
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Captive nut in thick fibreglass
I need to put a captive fixing in some thick fibreglass but have no way of getting to the back of the panel, it did have a rivnut in it but due to the
thickness this did not hold and has pulled out.
The hole is around 10mm for a m6 rivnut.
Any ideas ???
Thanks Matty
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ReMan
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| posted on 1/9/14 at 08:51 PM |
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For anything more than cosmetic load I'd have thought you need to put a bonded in substantial tapped plate of some description at production.
Are you trying to do this into an existing piece of fibreglass?
www.plusnine.co.uk
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twybrow
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| posted on 1/9/14 at 09:53 PM |
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Google 'Big Heads'. They are fasteners for composites. They bond to the surface using PU or similar. You can even apply for free samples
of what you want from their website! I have several on my car. I also made my own when I needed something oddball.
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MikeRJ
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| posted on 1/9/14 at 09:56 PM |
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For fibreglass you can use rubber "well" nuts. These expand behind the fibreglass when tightened, but being rubber the distribute the
stress around the hole so you don't risk cracking.
Easily available on eBay in various diameters and lengths and they are fairly cheap.
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inkafone
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| posted on 1/9/14 at 10:07 PM |
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Plasterboard anchors work - like Heavy Duty Gun Hollow Dry Wall Cavity Fixing Anchor Setting Tool Not Silverline . Or use a
threaded insert, use masking tape when screwing in to minimise any gelcoat cracking.
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matty h
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| posted on 1/9/14 at 10:07 PM |
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Seen the big head fixing was looking at using one of these until I found out I could not get in behind the panel.
The rubber well nuts could look like the way forward or the cavity wall fixing.
Thanks everyone for the suggestions.
Matty
[Edited on 1/9/14 by matty h]
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twybrow
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| posted on 1/9/14 at 11:23 PM |
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quote:
Originally posted by matty h
Seen the big head fixing was looking at using one of these until I found out I could not get in behind the panel.
The rubber well nuts could look like the way forward or the cavity wall fixing.
Thanks everyone for the suggestions.
Matty
[Edited on 1/9/14 by matty h]
No need to get behind the panel. Drill it and bond it to the outer surface so the threaded section is in the fibreglass. You could even grind a small
recess so it is all flush.
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renetom
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| posted on 2/9/14 at 08:07 AM |
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fix
Toggle bolts should do the job & gets something behind the panel
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rdodger
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| posted on 2/9/14 at 02:34 PM |
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I have used these in similar circumstances
http://www.modelfixings.co.uk/threaded_inserts.htm
I used a blob of epoxy on them before screwing them in.
http://www.shop4fasteners.co.uk/threaded-inserts/self-tapping-inserts-for-soft-wood/c-24/p-966
[Edited on 2/9/14 by rdodger]
[Edited on 2/9/14 by rdodger]
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