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The BF Floating Ballscrew Support Units, often used in combination with the BK Fixed Ballscrew Support Units. For example for a BK10 the counterpart is the BF10. The only thing that is a bit confusing, is that a BK10 has a 10mm inside diameter like you would expect, but the BF10 that goes on the floating end has an 8mm bore. Once you know, and have the correct end machining on the ballscrew it's no problem at all.
