THK BNF Series Full-Ball Type Precision Ball Screw

The THK BNF Single Nut Series is the simplest setup within THK’s full ball type precision ball screw lineup, using just a single ball screw nut. Its straightforward build gives you reliable, consistent linear motion, making it a solid choice for general positioning tasks where a preload mechanism isn’t needed.

It uses a return pipe design and comes without preload, which keeps the overall structure simple while still delivering the precision positioning that ball screws are known for. The series is available in screw shaft diameters of 55mm, 63mm, 70mm, 80mm, and 100mm, so you can pick the size that matches your load and application needs.