What Is A Ball Screw Support BK BF?
BK and BF are the two ends of a ball screw support bearing block set — BK is the fixed-end support that handles axial load, and BF is the floating-end support that allows for thermal expansion along the screw's length. TriQuench India supplies matched BK/BF support sets for CNC ball screw installations.
Technical Product Matrix: Ball Screw Support BK BF Configurations
| Parameter Model | Key Capacity | Vibration Tolerance | Standard Grade |
|---|---|---|---|
| TriQuench Elite Series | High Speed Output | < 2.0 microns | ISO 1940 G0.4 |
| TriQuench Standard Series | Consistent Continuous Duty | < 5.0 microns | ISO 1940 G2.5 |
Frequently Asked Questions — Ball Screw Support BK BF
What is the difference between a BK and BF ball screw support?
The BK support is the fixed end, bearing the axial thrust load, while the BF support is the floating end, allowing the screw to expand slightly with temperature changes without binding.
Why do ball screws need both BK and BF supports?
Using both prevents the screw from binding due to thermal expansion while still providing the rigid axial support needed for accurate positioning.
Technical specifications and contents verified by our directors:Parag Shah (Founder & Director)&Kaushal Panchal (Co-Founder & Technical Director)