http://en.wikipedia.org/wiki/Stainless_steel

https://www.google.com/#q=METALS+LOW+FRICTION+SURFACE

BRASS and bronze are 'slippery'...the Worlds fair Exhibit at the Smithsonian is filled with brass bushinged machinery.

Babbit may be slippery..you now Babbit ?

http://goo.gl/yxsGlt

stainless nuts n bolts at the hardware store are usually weak mmmm like grade 2 or 2+...marine stainless is better and costs more...then there is Chinese stainless, prob Japanese which is prob good, and Americam (maybe)

http://www.mcmaster.com/#socket-head-cap-screws/=wbkjjr

tap the stainless blue link at bottom chart