This question is for mechanical engineers?
Answer:
http://www.mcmaster.com for most things
http://www.sdp-si.com/ for belts gears,pulleys.
Am i the best or what?
Yoho, You're OK I guess, but lots of people know about McMaster.
It is very hard to get a paper McMaster catalog, as far as I know they are only sent to business or maybe really good customers, however their web site is one of the best I've seen for this kind of thing.
Lots of industrial supply companies sell similar sorts of stuff, McMaster is my favorite, but you might also try MSC; http://www1.mscdirect.com/cgi/nnsrhm...
You may be better off visiting a nearest college enginerring library where they stock recent versions of many catalogs. My personal favorite is Omega. You may also be interested in the Thomas Register as well as Grainger. Good luck.
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