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Kingpinless caster rigs are different from standard kingpin caster rigs in that the swivel section is held together without a rivet or nut and bolt kingpin. Kingpinless caster rigs are held together by a single row of ball bearings that are contained by a full contact interlocking swivel raceway design. Kingpinless casters are ideal for towing, conveyor, maintenance/utility carts, Towlines, drag lines and more robust applications seen in industrial environments.
For more info, check out Caster Rig Types.