THK LBST40-4 Linear Ball Bushing Bearing

The THK LBST40-4 Linear Ball Bushing Bearing is a precision cylindrical linear bearing that delivers smooth, low-friction travel on hardened LM shafts with a 40 mm nominal diameter. This recirculating-ball bushing combines heat-treated bearing steel construction with recirculating steel balls to provide high load capacity and stable positioning at high speeds, with grease or oil lubrication. Compatible with hardened and ground LM shafts, its LBST series design is commonly used in CNC machinery, automated manufacturing systems, industrial robots, semiconductor processing equipment, packaging machines, medical and inspection equipment, and other precision motion applications requiring accurate, low-friction linear motion. Typical replacements include THK LM40UU, LM40LUU, and LME40UU.