View Full Version : power supply posts out Stainless bolts vs copper ?

09-15-2010, 01:47 PM
I am building a big power supply system for my chargers and need some bolts probably 10mm, going through the enclosure to some copper distribution strips 5mm thick 20mm wide, what materials should these bolts be made out of, they will see 100 amps at the most, do I need copper bolts or can I use steel bolts ? Is stainless better than mild steel ?
Any advice as far as electrical conductivity of diff material bolts is welcome.

09-15-2010, 03:04 PM
Brett, Just off the top of my head I would say use copper.
But if you use steel I would use stainless steel. That way it will not rust.

09-15-2010, 03:10 PM
Any good sources for copper bolts then ?

09-15-2010, 03:19 PM
You have to worry about electrolysis effects from high currents and dissimilar metals so I'd don't think I'd use stainless (which has iron content). In my opinion, your best bet would be brass which is more available, more durable, and very compatible with copper.

09-15-2010, 04:49 PM
Brass is a good idea.
I found some at McMaster-carr