BK / BF Series – General Purpose Ball Screw Support Unit

The BK/BF series is our most widely used general purpose ball screw support unit, with BK as fixed end and BF as supported end. This series is designed for complete assembly interchangeability with equivalent series from brands such as HIWIN, THK, and PMI. Default configuration uses economical deep groove ball bearings, with angular contact ball bearings available upon request. Offered in C5 and C7 accuracy grades, suitable for general industrial equipment, small to medium CNC machine tools, and other general purpose applications.

Key Features

• Assembly Replacement – Direct replacement of existing same-series assemblies (fixed end + supported end) in customer equipment
• Flexible Bearing Options – Default deep groove ball bearings; optional angular contact ball bearings
• Dual Accuracy Grades – C7 for general transmission; C5 for precision positioning; flexible cost-performance ratio
• Pre-Lubricated – Grease applied before shipment; ready for installation upon delivery, saving on-site assembly time
• Wide Size Range – Fits screw shaft diameters from 10mm to 40mm, meeting most general equipment requirements

Full Specifications