[nelsonjm]

I was looking for socket head cap screws that could support about 1lb didn't cost that much, and wouldn't cause galvanic corrosion with a plate of 6061 aluminum (that will be tapped).

Right now I'm planning on using aluminum bolts, but I was wondering if there was something cheaper (and not plastic).

Surely someone in the bike industry knows something about this!

 

[ridiculous]

Can you paint or treat the plate you are screwing into? A good seal could drastically reduce your problem here and possibly allow for a conventional fastener to be used.

Another possibility is an aluminum or plastic washer between the screw head and the plate. Just make sure that the threads are sealed off either by the washer or tef-gel like product.

 

[MMike]

wrap the fastener in bacon to isolate it.

That's ridemonkey advice right there.......

 

[buildyourown]

How severe an environment are we talking about? A SS bolt in 6061 will stand up to anything accept salt spray. A little dielectric grease will help.

 

[MMike]

Ah...but how will the 6061 parent mat'l hold up?

 

[MMike]

The engineer corrects the technician......unpossible........

 

[MMike]

............that said however, unless you're going to be doing all of this in the Gulf of Mexico or something, I'd say the risk of SERIOUS galvanic corrosion is fairly low.

 

[johnbryanpeters]

............that said however, unless you're going to be doing all of this in the Gulf of Mexico or something, I'd say the risk of SERIOUS galvanic corrosion is fairly low.

A little road salt goes a long way, as we have all discovered...

 

[MMike]

A little road salt goes a long way, as we have all discovered...

But I didn't think this was a bike application. He was just looking for advice from bike people! We don't even know if it's outdoors.....

 

[nelsonjm]

This particular item will be for indoor use only (It's actually for a clock I am designing) so it's not going to be exposed to harsh temperatures or weather. It will be bead-blasted, but no other coating will be applied.

I wanted to ask because if I wanted to design something bike-related in the future, it could be important! I knew about the issue, but up until now, I hadn't really thought about what material/coating my chainring, stem, axle bolts were made of or should be made of.

 

[MMike]

meh...it will corrode eventually...but it'll take a while. I'm sure something else will fail before galvanic corrosion becomes your life limiting factor.

For other stuff. Anodize or even alodine can help.

 

[johnbryanpeters]

For an indoor clock, galvanic corrosion should not be a consideration absent you or the cat pissing on the clock. Use stainless cap screws if you want to be classy.

 

[MMike]

For an indoor clock, galvanic corrosion should not be a consideration absent you or the cat pissing on the clock. Use stainless cap screws if you want to be classy.

"Look kids! Big Ben!"

That's an OUTDOOR clock.

 

[4xBoy]

A little road salt goes a long way, as we have all discovered...

Not far from my house, a friend was on it at that time.