Jack Nuts - Page 2 - Fiberglass RV


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Old 09-01-2013, 10:54 AM   #15
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Name: Roy
Trailer: 1972 boler American and 1979 Trillium 4500
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Originally Posted by RRJR View Post
What's a JACK NUT, any pictures of same.and how do they work?
JACK NUT threaded insert

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I was always told anything in moderation was less harmful, sometimes it could be good for you.
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Old 09-01-2013, 11:19 AM   #16
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Name: J
Trailer: Escape 19
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Jack nuts require large body hole diameter (7/16" dia. for 1/4" bolt). Require puller. Tendency to spin with corroded or cross threaded bolt and then you got fun. Outer flange sets proud of surface. I consider them light duty junk. The rivnuts for aircraft installation are must more reliable but we always pulled them in epoxy sealer anyway.

jack
Hey,

This ^ rivnuts are a much better option but they too are subject to larger hole, correct installation tool (You can get one that will do 3 sizes of rivnut) highly suggest you epoxy them same as Jack said. If they break loose and spin it is a major PITA to drill them out in fiberglass, if you can't get to the back side. We would use a dental burr on a pencil grinder to grind the head off CAREFULLY. Most of us myself included would put a thin plate of stainless with the appropriate sized hole to fit over the head down first. Then grind so if you slip you do not grind into the fiberglass 15k rpm dental burr makes short work of going through fiberglass. There is another option if you are handy you can use nut plates ( Plate w/ floating nut crimped in place) they use two tiny rivets to hold them in place
http://www.nutplates.com/capped%20info.html. The have them in sealed and open style see http://www.cherryaerospace.com/files...og/CA-1031.pdf for another style mind you using aircraft grade items gets PRICEY.

Cypher

PS Jack in another life were you Air Craft Structural Repair also ?
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