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 producers this dimension can vary greatly slightly when different brands of bearings are used. Should you have a crucial application please call for specific dimensions.
Inner Race projection has 2 set screws 
on long side to secure bearing to shaft.
“Basic Dynamic Rankings” calculated in accordance to AFBMA regular for “Long Rating And Fatigue Life For Ball Bearings”
Accurately machined, medium carbon steel sprockets and precision ground ball bearings are assembled to supply a heavy duty idler for the most severe conditions. The bearings are pre-lubricated and sealed to maintain 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 gadgets. It also provides clearance for the chain when bolting the sprocket directly to a body member or tensioning device. A little sprocket for close quarters and a larger one for heavier program is provided in each pitch. If sizes apart from those listed are required, please inquire for quotation.