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  #11  
Old 09-20-2021, 08:43 AM
John Tierney John Tierney is offline
 
Join Date: Jan 2006
Location: Vonore, TN
Posts: 506
Default

Check for accessory brackets like your fire extinguisher holder.
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  #12  
Old 09-20-2021, 12:49 PM
FinnFlyer FinnFlyer is offline
 
Join Date: Aug 2018
Location: Bell, FL
Posts: 572
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Again, check behind the panel. Isn't that the kind of screw that might be used on switches and switch/breakers?

Finn
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  #13  
Old 09-20-2021, 01:22 PM
jclark jclark is offline
 
Join Date: Jan 2005
Location: Columbia, SC
Posts: 840
Default A VERY different thought ...

Quote:
Originally Posted by craig.roser View Post
When upside down the other day this screw plinked on the canopy. When I turned upright it landed in my lap. I have looked and cannot find an empty hole, and I cannot find a similar screw.

Any ideas where this particular screw is used?
This looks VERY similar to the screws used in the EarthX batteries.
(Was just working with some.)

Do you have those? If so, have you been working on those lately? And further of so, are they in you cockpit?

Of course, I am assuming that if all the above is true you, dropped an EXTRA one as if one fell you you would have noticed.

Just an "out of the box" idea.
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  #14  
Old 09-20-2021, 05:18 PM
Pdtofly Pdtofly is offline
 
Join Date: Jan 2012
Location: Reno, NV
Posts: 523
Default Circuit Breakerís

I have a bunch of circuit breakers that an airline mechanic friend gave me. They uses screws like that.

Good luck in your search.
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  #15  
Old 09-20-2021, 09:15 PM
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Steve Melton Steve Melton is online now
 
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yeah, finding a loose screw will give you heartburn. understand the concern.
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Simplicity is the art in design.
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  #16  
Old 09-21-2021, 03:56 AM
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rzbill rzbill is offline
 
Join Date: Nov 2005
Location: Asheville, NC
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Default

Quote:
Originally Posted by craig.roser View Post
When upside down the other day this screw plinked on the canopy. When I turned upright it landed in my lap. I have looked and cannot find an empty hole, and I cannot find a similar screw.

Any ideas where this particular screw is used?
Are you the original builder.? You signature indicates no?

I ask because I replaced a large quantity of #8 screws in the cabin with these because they are very easy to drive with an electric screwdriver and a hex socket.
No need to hold pressure on a Phillips bit while in an uncomfortable contorted position.

Original builder could have done same.

Its a NAS1801-08-07 by the way. Spruce caries them.
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Last edited by rzbill : 09-21-2021 at 07:02 PM. Reason: More data
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  #17  
Old 09-21-2021, 04:17 AM
fixnflyguy fixnflyguy is offline
 
Join Date: Jan 2006
Location: Winston-Salem, N.C.
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Default CB ,Adel,or AVX

Very common screw in the heavy jet industry, most often for Adel clamps , grounding connections or Circuit Breaker terminals. The CB terminal screws are usually shorter # 6 or #8's. My bet is someone was trying to secure an Adel clamp and it went sailing into the abyss, as often happens. I have a zillion or more in my inventory..not a structural screw.
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  #18  
Old 09-21-2021, 06:17 AM
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caryr caryr is offline
 
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Location: northwest georgia
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It kinda looks like the screw that comes with 'threaded terminal' batteries.

They are usually 10mm socket head with a Phillips center.

Can't exactly tell from the picture the relative size.
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  #19  
Old 09-21-2021, 11:10 AM
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craig.roser craig.roser is offline
 
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It's a #8 screw. 1/4 inch hex head with Phillips.
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  #20  
Old 09-21-2021, 11:23 AM
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rv6n6r rv6n6r is offline
 
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Location: Gearhart Oregon
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Default

Hey, I've been looking everywhere for that screw!
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