Ngezakhiwo ezimbini ze-bore cylindrical okanye i-tapered kunye nee-retainers ezenziwe nge-steel sheet okanye i-synthetic resins, ii-bearings ziyimpawu yeendlela zazo zangaphandle ze-ring ezibunjwe ngokwesangqa ezivumela ukungalingani ngaphakathi kwe-3° ukuphambuka phakathi kwe-inner ring kunye ne-outer ring, ukuze kulungiswe iimpazamo ze-concentricity kunye ne-deflection.
