No!
I'm a cheap guy. Last year I bought a cheap Chinese stem from ebay to play around with my bike position. Got it, looked fine. Used it on my indoor bike trainer, worked fine. Took it on a couple hour bike ride. Seemed fine. Second bike ride my handlebars moved a little bit when I went over a bump, so I snugged up the bolts and went home. Where I found that the metal in the stem had stretched almost four mm, causing the looseness. Would not have been a good situation if it had snapped off while I was descending. You know who's doing safety and quality control on Chinese made stuff? Nobody.
Chinese jersey? Sure. Chinese bottle cage? Sure. Chinese anything that might impact my safety? Never again. No stem, bars, helmets, bolts, frame, forks, wheel, spokes, nothing of the sort. It's not worth saving a few bucks to end up unable to ride your bike or dead because of a bad accident.