Construction and Features Two or three longitudinal ridges are provided on the spline shafts of Ball Splines types LT and LF. Two rows of balls are in close contact with both sides of each ridge for four or six rows of balls in total, so that the Ball Splines can be reasonably preloaded. The rows of balls are maintained by a retainer made of special synthetic resin and installed inside the spline nut in such a way
