Advanced Materials & Tribology supplies Ball Spline type Linear Motion Bushes. Advanced Materials & Tribology offers a wide range of Oil-less self-lubricated Bearings and Plates, Self Lubricating Bushes and Pump Bearings. Advanced Materials & Tribology is an ISO accredited company. The Ball Spline type Linear Motion Bushes is available with Two or three longitudinal ridges provided on the spline shafts of Ball Splines and are equally spaced at 120° intervals. The Linear Motion Bushes maintain the balls by a retainer in such a manner that they neatly circulate along the raceways.