1.Product Overview The THK BF40 is a square-type fixed-end or supported-side ball screw support unit designed for a 40mm shaft diameter, utilizing a deep-groove ball bearing to stabilize rotating machine components 👉 Get a quote within 24 hours for your project 2.Technical Specifications Model: BF 40 Inner Diameter (ID): 40 mm Outer Diameter (OD): 37 mm Width: 160 mm Structure: Ball screw side support Cage: Steel cage Clearance Class: C3 enlarged radial clearance Design: