Advanced Materials & Tribology supplies Cam Followers with Piping Tap Holes. 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 Cam Followers with Piping Tap Holes is suitable for use in places requiring piping for centralized lubrication. The Cam Followers has piping tap holes machined into the stud head part and the threaded portion of the standard cam follower. The Cam Followers are made up of stainless steel.