Idler Sprockets: Ball Bearing Idler Sprockets have sealed ball bearings with extended inner competition and setscrews for securing to the shaft.
Projection From Centerline – Because of dimensional variation among bearing manufacturers this dimension can vary greatly slightly when different brands of bearings are used. Should you have a crucial application please demand specific dimensions.
Inner Race projection has 2 arranged screws on long part to secure bearing to shaft.
“Basic Dynamic Ratings” calculated according to AFBMA regular for “Long Rating And Fatigue Lifestyle For Ball 
Bearings”
Accurately machined, medium carbon steel sprockets and precision floor ball bearings are assembled to supply much duty idler for the many severe conditions. The bearings are pre-lubricated and sealed to maintain grease and exclude dirt and moisture. They are not re-lubricatable. The extended internal race with sprockets setscrew enables fastening to a pin or shaft without collars or spacing devices. It also provides clearance for the chain when bolting the sprocket directly to a body member or tensioning gadget. A little sprocket for close quarters and a more substantial one for heavier service is provided in each pitch. If sizes other than those listed are needed, make sure you inquire for quotation.