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  #1  
Old August 23rd, 2009, 11:31 AM
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Christopher Giles
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Constantly confused by bolt materials

Okay, I'll admit I have read so much mt head is spinning. What is the best bolt or screw material to use in aluminum? I just pur in some aluminum rivnuts and don;t know what type of bolts is best served. Stainless? Grade 10.9? Grade 12.9? (for screws) Grade 8? (for bolts) How do I minimize rust and/or corrosion? Thanks!
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  #2  
Old August 23rd, 2009, 12:45 PM
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The best way to minimize corrosion is to use the same material. Technically, if you use stainless, you've made a battery and the aluminum will sacrifice electrons and corrode (did I say that right, someone correct me if I screwed up).

Anyway, the aluminum rivnut isn't very strong, so I assume this isn't a high-strength scenario. If you use a regular steel bolt with some anti-sieze, it will be good for a long time. Even stainless might be OK if you use thread sealant, anti-sieze, or just don't get it wet, but its less of a sure thing.
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Old August 23rd, 2009, 01:08 PM
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Christopher Giles
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I used them to put on wing top protectors; more easily removable when and/if I need to take them off. The aren't under and load in any particular direction. I used a grade 10.9, black steel bolt. It sounds like that is my best bet.

I used these:

http://www.mcmaster.com/#91294a238/=3bctmq
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Old August 23rd, 2009, 01:34 PM
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It really doesn't matter. The whole issue is overblown. If you still worrie about it, a small nylon washer will minimize contact.
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Old August 23rd, 2009, 04:56 PM
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Galvanized is the best to use with aluminum as the anodic index of them isn't too much of a spread. That was the reason Land Rovers used mostly galvanized fasteners.
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Old August 24th, 2009, 10:08 AM
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Why not use aluminum bolts and just use a couple more and perhaps a size up, it is not like a wingtop gets a lot of torque put on it and if you are putting a bead of silicone around that pretty much does all the grip you will need anyway.
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Old August 24th, 2009, 10:46 AM
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For wing top plates just rivet them right to the wing, if you ever need to take them off (Why?) just drill the top of the rivets off.
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Old August 24th, 2009, 12:10 PM
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Quote:
Originally Posted by Buckon37s
It really doesn't matter. The whole issue is overblown. If you still worrie about it, a small nylon washer will minimize contact.
You are not permitted to speak on this matter as you live in California. For wingtop protectors, I would use plastic bolts like the license plate frame.
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