China will make and sell you what you ask for.
If you, as 'chief procurement officer' have asked for low quality goods for a cheap price, then I am fairly certain that the Chinese companies you are dealing with will oblige your request.
In my experience, China has the capability to delivery high quality (aerospace/other high precision goods) if they are required.
Edit - I am now interested in your experiences.... please share ....
Why did you go to China to buy, instead of sourcing hardware locally, if you are not happy with the quality of Chinese goods?
What engineering standards did you specify and what tolerances and materials did you use on your engineering drawings?
Did the company not meet your detail specifications or did you not specify what you required in enough detail (if they used cheapest materials)?