The Cessna 120-140 Association Forum

Can someone tell me correct rivet style and correct sizes? And also a part number or size for the rivet sets and where I might get the rivet sets?
I’m doing the legwork for my A&P to find the correct rivets and rivet set for a repair on a 120 project.
Panel 35 in the drawing below has a couple cracks around rivets, so we are pulling this and refabricating the metal. I believe the rivets are AN455, but seeing if someone here can confirm that.
I believe the rivets that encircle the stinger are a bigger size than the rivets that run horizontally on panel 35 itself.
Any expertise is appreciated

Yes the original rivets were AN455, brazier head, but they are almost impossible to find.
The standard replacement for them is tha AN470, universal head.
As far as rivet size your A&P should be able to figure out diameter and length.

Rick

Interested in how you found the cracks. Are they visible outside or inside, any pictures. Looks like something we all might want to check.

Yes, the cracks were evident only after I pressure washed the frames and blew out some filler or caulking someone had put In the cracks. A couple of factors may be in play here. 1. This aircraft sat in a hangar or shed for years and mice pee did its thing in that particular seem, so there was that crusty corrosion that seems like it swelled over time. 2 from the looks of the rudder,(accordion), this gal had been over on its back, so that certainly could have contributespd. Like other project aircraft, logs are pretty sketchy, so no indication of a wreck, but I suspect that happened….

If your airplane had a short antenna above the forward spar and it did go over on its back you need to put a straight edge on it and see if it is bent.
Here is what I found on mine. I did replace the spar and cabin top.

Rick