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What type of rivets are people using for nut plates on the 4130 tabs? Should I be worried about galvanic corrosion with the different types of metals? Thanks for the advice.
Allen
Allen
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I used solid aluminum rivets, but I did primer the holes in the tabs first. If any galvanic corrosion occurs, it would be the rivets that go first. -
That’s sorta what I was figuring. Thanks for the advice.Comment
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NAS1097AD3 rivets. Buy dash 3, and 3.5 and 4 lengths. Spruce does not carry them. Wicks, Vans, and Aircraft Tool Supply has them. You dont need a whole pound. a tenth of a pound is a few hundred.
BTW, the NAS1097 rivet has a reduced head. The are easy to install because the small head requires only slight countersinking. .025 material is plenty thick to countersink. I countersink with my deburring tool.Brooks Cone
Southeast Michigan
Patrol #303, Kit buildComment
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Those rivets can be used on any non-load bearing nut plate which are the vast majority of nut plates. As Brooks said, they are so much easier to install than standard AN426 flush rivets.John Hansen
Leavenworth, WA
Bearhawk 5 QB #63
IO-540-D4 with EFII System 32Comment
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Thanks for the advice. I see those are still aluminum rivets. My biggest concern was corrosion with the 2 different types of metals but it sounds like it’s really a non event.Comment
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The hardest and most consequential thing about building can be knowing which small details matter a lot and which ones don't. Nobody is born knowing this kind of thing, and you may find different builders weigh risk differently.
In the case of aluminum rivets joining the steel tabs for nut plates, I would personally not be worried. Like any risk factor, we evaluate the likelihood of something happening, combined with the consequence of it happening.
Even if you get corrosion, you will have a maintenance inconvenience in this case and not a safety of flight issue. The steel screw and nutplate will still hold the load, until you go to remove the screw all will be fine and you probably wouldn't know it.
Having said that though, I really like using monadnocks or tinnermans whenever possible on tabs. They can shift around a little if you need, and if one gets galled or stripped you can replace it in seconds.Comment
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