Floating Single Roller Pillow Block Bearing F-SPB-10-OPN-S for 5/8" Shaft Diameter, ScraperFloating Single Roller Bearing Pillow Block for a 5 8" shaft diameter. Floating Roller Pillow Blocks should be used on one shaft with a standard pillow block on the other, to compensate for any misalignment. This is the only product on the market that does this. Single Roller Bearing Pillow Block with Floating technology. It is recommended that you order F SPB floater pillow blocks for one shaft while ordering regular roller pillow blocks for the