How to choose a spacer/stand-off to maintain electrical contact?
Not sure if your application is more sensitive than the computer motherboard, brass standoffs like these are commonly used in computer chassis. They connect motherboard ground to the chassis.


Available - These standoffs and screws are easy to get.
Reliable  - I haven't seen one with corrosion yet in 20 years. (Reliable)
Monolithic - Less parts. As you don't want to provide special training to your assembly &amp; manufacturing crew, this option has the least parts count and is
straightforward.


According to wikipedia, certain brasses are used where there is a risk of corrosion from factors like chlorides, soft water, etc.