: Specifically BK (fixed side for the motor) and BF (floated side) bearing blocks.
Buying a "kit" is often better for beginners because it ensures compatibility. A proper kit should include: : The housing that contains the ball bearings. ball screw buy
: Common sizes like 16mm (SFU16xx) or 20mm (SFU20xx) are standard. Larger diameters provide more rigidity and higher load capacity. : Specifically BK (fixed side for the motor)
: A bracket to attach the nut to your machine's gantry or carriage. : Common sizes like 16mm (SFU16xx) or 20mm
💡 Check if the screw ends are machined . Most sellers offer "standard machining" for BK/BF blocks. If they aren't machined, you'll need a lathe to fit them into the bearings yourself. If you'd like to narrow this down, let me know: What are you building ? (e.g., CNC, 3D printer, heavy lift) How much weight/load will it carry? Do you have a specific budget in mind?
Ball screw accuracy is categorized by "C" grades. The lower the number, the higher the precision.