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. Should you have a crucial application please demand specific dimensions.
Inner Race projection provides 2 set screws on long part to secure bearing to shaft.
“Basic Dynamic Ratings” calculated according to AFBMA 
regular for “Long Ranking And Fatigue Life For Ball Bearings”
Accurately machined, medium carbon steel sprockets and precision surface ball bearings are assembled to supply a heavy duty idler for the most serious conditions. The bearings are pre-lubricated and sealed to preserve grease and exclude dirt and moisture. They are not re-lubricatable. The extended inner race with setscrew enables fastening to a pin or shaft without collars or spacing devices. It also provides clearance for the chain when chain sprocket bolting the sprocket right to a frame member or tensioning gadget. A small sprocket for close quarters and a more substantial one for heavier support is supplied in each pitch. If sizes apart from those listed are necessary, please inquire for quotation.