SFA: HIWIN SFA are ready-to-install fixed-end ballscrew bearing units, available as flange bearings or pillow blocks, designed to absorb both axial and radial forces at the driven end of the ballscrew. Offering a simple, fast bearing arrangement for ballscrew installations in industrial and automation machinery. Compatible with HIWIN ballscrews and matched to the SLA supported-end unit for a complete linear motion solution.