Back to the Chinese crap products...at work we get a lot of 4 bolt flanges from China for tube assemblies we build for a couple companies that make big yellow earth moving equipment. These come from an "approved" supplier in China. These things are cheap as hell....and junk as far as being within tolerance....forget it....they are all over the place dimensionally but, they bolt up to there equipment and they are cheap. Those companies who build big yellow earth moving equipment want us to use them because they have investments in these Chinese companies so it keeps there cost of our products down and that in turn makes it cheaper for them. These huge companies dont give a hoot about quality of the several million dollar equipment your buying....they care about their bottom line...Chinese steel is not to US standards, their machining capabilities suck and, the overall quality is not good at all....