THK EK, EK-L, BK, and FK Series Support Unit

These support units sit on the fixed side of a ball screw assembly and include a JIS Class 5 compliant angular bearing with an adjusted preload, so they’re ready to mount straight onto your equipment without further machining. Model EK matches the shaft end shape of THK’s BNK and SDA-VZ precision ball screws with finished shaft ends, with an inner diameter from 4mm to 20mm. Model EK-L matches the SDA-VCZ shaft end shape and keeps the shaft center low for a more compact design, covering inner diameters from 8mm to 15mm. Model BK is a standardized square type for general use with ball screws, covering inner diameters from 10mm to 40mm, while Model FK is the round type equivalent matching the BNK shaft end shape, covering inner diameters from 4mm to 30mm.

Pairing the right support unit with your ball screw and nut bracket cuts down design and assembly time significantly.