MCFD40 Track Roller Cam Follower Needle Roller Bearing 18x40x58mmNUKR40 MCFD40 Cam Follower Track Roller 18mm ID 40mm OD 58mm Length This MCFD40 cam follower is a heavy duty needle roller bearing featuring a full complement of rollers for maximum load support. Designed with axial guidance and sealed on both sides, it's a great fit for guide tracks, linear motion systems, and cam mechanisms in automation or industrial machinery. Type: Cam follower needle roller bearing Inner diameter: 18mm Outer diameter: 40mm