1. QBC is an American bearing company, whose full name is: quality bearings &; Components, the first letter is QBC. 2. QBC mainly distributes bearings and represents many brands of bearings all over the world, the most famous of which is linear motion ball bearings. 3. The website of QBC Company is: Only one of the above is right, it is "imported bearing". I have a complete set of sample books of QBC bearings.