Advanced Materials & Tribology supplies Furnace Tap Gate Cam Followers. 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 Furnace Tap Gate Cam Followers are used to open and close metal plate slides of a furnace tap gate by rolling on stationary rails. The Cam Followers are grease lubricated and certainly locks-up when exposed to the expected 750° F.