Advanced Materials & Tribology offers Simple-Nut Type Ball Screw. Advanced Materials & Tribology supplies a wide range of Oil-less self-lubricated Bearings and Plates, Self Lubricating Bushes and Pump Bearings. Advanced Materials & Tribology is an ISO certified company. The Simple-Nut Type Ball Screw is cost effective and can achieve a clearance in the axial direction at or below zero for high-precision positioning and rigidity. The Ball Screw is capable of achieving smooth motion even under a preload with a below zero clearance in the axial direction.