Abstract: Two concentric tubes made from a lightweight plastic are locked together by two plastic cylindrical end pieces having an aperture formed in the center thereof. The outer plastic tube rotatably supports an advancing conveyor belt carrying a bulk type material, while the inner plastic tube receives the turning torque stress. Self-lubricating plastic bearing members having blind sockets formed in the center thereof are dimensioned to be inserted in the ends of the roller. Stub shafts having generally spherical stainless steel bearing portions formed on the ends thereof are closely received within the blind sockets to rotatably suspend the roller assembly therebetween. Under such high speed, heavy-duty operations the heat built up in the stainless steel bearing is dissipated through an aluminum stub shaft to the frame assembly for the bulk material handling system.