Face it, a very large part of our parts business and all business's combined, comes from China. I cannot speak for the quality of those items that are sold in the home country, i.e., China, India etc...
But, having worked briefly for a kit car company that imported many parts from China, I learned that the Chinese were very capable of building any type of part to any tolerance needed by the customer. Of course High tolerances, higher quality and higher quality control can happen with the addition of higher dollar investment. As the expression goes, you literally get what you pay for.
In years gone by we would tend to over build things for various reasons. We didn't know the stress involved with a certain product, we wanted to build it better and safer. So we built the best we could. But now, with the advent of computer technology, we can build products that are "stress tested," build them just good enough, the hell with building it much better because we can save money by building it cheaper. I've seen some beautiful work that came from a Chinese factory, but it will cost you.
If you tell them what you want and give them the parameters they need to follow, they are more than capable of turning out a high quality piece.
All these high tech parts that are needed for our phones and computers, they are not made in these countries just because they are cheap. If the product did not conform to the quality needed by say Apple, or any of the tech companies, do you think they would keep buying from them? No, they would go elsewhere. But they are able to produce those quality products at a price better than can be found in the U.S. Economics 101.