The HAINBUCH B-Top is a 3-jaw wedge rod power chuck designed for CNC turning applications where fast jaw changeovers and high precision are required. The wedge rod mechanism converts axial draw-tube force into radial jaw clamping through a proven wedge-and-rod interface. The B-Top3 variant adds the CENTREX quick-change interface, enabling jaw changes with µ-level repeatability — no re-machining or regrinding needed after a jaw swap.

How do the B-Top sizes compare?

What is the CENTREX quick-change interface?

The CENTREX system on B-Top3 chucks provides a precision interface between the chuck body and add-on clamping elements. Each jaw change achieves µ-level positional repeatability without re-machining top jaws — a significant time saving in batch production environments where frequent changeovers between workpiece diameters are required. The modular design allows conversion between full inner clamping (segmented bushing), full outer clamping (clamping head), and standard jaw clamping without removing the chuck from the machine spindle.

What applications benefit most from the B-Top design?

The B-Top wedge rod mechanism is particularly effective for medium to high-speed CNC turning where consistent clamping force is needed across a range of spindle speeds. The 6,000 rpm maximum on the size 165 makes it suitable for small-part high-speed turning, while the size 315 — with 160 kN clamping force and a 104 mm through-bore — handles heavy roughing of large shaft and flange components. HAINBUCH universal grease (Material No. 10001489) is specified for chuck lubrication.