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03-15-2017, 11:00 PM
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Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,573
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high strength rivet-nut?
Does anyone know of a high-strength, high-quality blind rivet-nut?
the NAS 1330 is an aluminum rivet-nut. I am wondering if there might be a strong steel nut that might exist, maybe by Cherry?
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Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 625
LS6-15/18W sailplane SOLD
bought my old LS6-A back!! 
VAF donation Jan 2020
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03-16-2017, 04:51 AM
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Join Date: Jun 2007
Location: palm coast fl.
Posts: 945
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Rivetnut
McMaster Carr has them in Steel and Stainless Steel. I buy them 1/4-20 and larger , not sure about smaller and fine thread .
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Rv8
N 666 TA
First Flight 2-3-2015 🚀
2017 donation paid
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03-16-2017, 07:52 AM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,686
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Rivnuts are the devil
Unless you use them in thicker material (which we don't use much on the RV's) and use the keyed units (special install tools), they are guaranteed to 'spin' down the road at some point which makes fastener removal difficult if not impossible.
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Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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03-16-2017, 08:22 AM
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Join Date: Dec 2006
Location: Belleville
Posts: 306
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49clipper
I agree with Walt. They are a real pain down the road. do not use in less than .040".
Jim
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03-16-2017, 10:31 AM
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Join Date: Jan 2008
Location: Ashland, OR
Posts: 2,573
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I agree in general with Walt's comments, although I have had good luck hand-filing a key notch for the keyed type. None have spun on me. I have used them in non-critical places where if it did spin, I can actually get pliers on them.
In this case, I am looking for a higher strength solution, and they really would be blind. Hopefully a one-time assembly, so as long as they don't spin on first tightening, all is good. The ability to install a flush, blind, nut would save me having to disassemble the part, which would involve screwing up paint, drilling out a ton of rivets, and then having to re-paint.
__________________
Steve Smith
Aeronautical Engineer
RV-8 N825RV
IO-360 A1A
WW 200RV
"The Magic Carpet"
Hobbs 625
LS6-15/18W sailplane SOLD
bought my old LS6-A back!! 
VAF donation Jan 2020
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03-16-2017, 10:59 AM
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Join Date: Feb 2010
Location: Vancouver, BC, Canada
Posts: 860
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Rivnut
Here's a link to the rivnut catalog. Five different types available in aluminum, steel, stainless steel.
http://www.bollhoff-usa.com/static/p...version-EN.pdf
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Terry Edwards
RV-9A (Fuselage)
2020/2021 VAF Contribution Sent
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