Dodge Hanger Ball Bearing Unit, Medium Duty Screw Conveyor, Series: 218, 3-1/2 in Bore Dia, 8.31 in Outside Dia, 2.56 in Width, 21451 lb Dynamic/16641 lb Static, Set Screw Collar Locking, Stainless Steel Bearing, Nylon Cage, 2000 rpm Maximum, -225 to 400 deg F, Polymer The Dodge SCM line uses 65 deg design which offers an optimum balance between locking force and inner ring stressThe nylon material provides a natural lubricity for longer lifeAn anti-rotation pin prevents rotation of the outer race within the housing, simple and effective, it makes system inserts easier to replace