Great job guys. I'm really curious about your panel fastening.
Question - would you guys mind sharing how your panels are secured? It looks like your using 120 degree flat heads along with tinnerman washers in all locations. Or are these tiny quarter turn fasteners? What size are these? Can you share the PN and source of the washers your using?
Also what hardware do you use on the back side? Nut plates? After doing some service do you have any concerns about the longevity of this combination?
I was planning on going allen head DZUS but I think this method might provide more positive retention. Any thoughts or opinions would be appreciated.
Thanks!
The fasteners are 100 degree flat-head 10-32 screws. Those that don't get frequently removed are stainless, those that do are CAD plated.
The fastener setup we used consists of three pieces: a floating nut plate, a recessed flat washer and the screw. All three pieces were sourced at Aircraft Spruce. They have an on-line catalog and a hard copy catalog. The screws are available in 1/8th inch increments and the nut plates both float as well as provide a mechanical locking/anti-back-out safety for the screws.
I know for sure on our facebook page there are pictures of the nut plates, I can't remember if I put them here on our build thread or not. When I get in front of a computer I will check this thread. If the pictures aren't here, I'll add them.
I don't have the full part numbers in front of me, only the memorized three digits that are used to identify the nut plates by size. The online catalog is easy to navigate though, you won't have any issues locating the screws, washers and nut plates.
When you are ready to tie into the project of installing the nut plates and counter-sinking the washers, we have a couple of tools we had professionally made that will help you out greatly.
I'll dig out the pictures and create a post detailing out the operation of installing the fasteners. I think it would be useful to others to see how we did it.