Idler Sprockets: Ball Bearing Idler Sprockets have sealed ball bearings with extended internal competition and setscrews for securing to the shaft.
Projection From Centerline – Due to dimensional variation among bearing producers this dimension can vary greatly slightly when different brands of bearings are used. In case you have a crucial application please call for specific dimensions.
Inner Race projection provides 2 set screws on long aspect to secure bearing to shaft.
“Basic Dynamic Ratings” calculated according to AFBMA 
standard for “Long Ranking And Fatigue Life For Ball Bearings”
Accurately machined, medium carbon steel sprockets and precision surface ball bearings are assembled to provide much duty idler for the many serious conditions. The bearings are pre-lubricated and sealed to preserve grease and exclude dirt and moisture. They are not re-lubricatable. The extended internal race with setscrew enables fastening to a pin or shaft without collars or spacing gadgets. In addition, it provides clearance for the chain when bolting the sprocket directly to a frame member or tensioning gadget. A little sprocket for close quarters and a larger one for heavier assistance is supplied in each pitch. If sizes other than those listed are necessary, make sure you inquire for quotation.