Engineered for facilities that can’t afford downtime, Caster City’s Maintenance-Free (MF) Series eliminates bearing maintenance through a precision triple-bearing system: sealed ball bearings in the wheel for effortless rolling, tapered roller bearings in the upper raceway for high-speed axial loads, and thrust ball bearings in the lower raceway for heavy radial and thrust loads. No grease fittings. No lubrication schedules. No maintenance stops. The extended swivel radius (6-1/2″ to 8-1/2″ depending on wheel size) reduces directional change effort by up to 50% compared to standard casters, critical for ergonomics in manual push/pull applications and battery conservation in AGV systems. Built with 5/16″ cold-forged steel legs, double-welded construction, and 3/8″ thick top plates, these casters handle capacities from 1,200 to 2,500 pounds per caster depending on wheel configuration. Yellow zinc chromate finish provides 4-6× better corrosion resistance than standard zinc plating, maintaining professional appearance and structural integrity through years of washdowns, chemical exposure, and demanding industrial environments.

Available in wheel diameters from 4″ to 10″ and widths of 2″ or 2.5″, the MF Series accommodates diverse load requirements and floor conditions. Choose the heavy-duty 4-1/2″ × 6-1/4″ mounting plate with slotted bolt pattern (2-7/16″ × 4-15/16″ to 3-3/8″ × 5-1/4″) for maximum mounting flexibility, or select the Model 9-compatible 4″ × 4-1/2″ plate for drop-in upgrades to existing equipment. Non-marking polyurethane wheels (80A to 95A durometer) protect floors while delivering quiet operation, debris rejection through crown tread design, and temperature stability from -20°F to 240°F. Ideal for automotive assembly lines requiring tight-radius maneuvering, AGV/tugger systems demanding minimal rolling resistance, aerospace cleanrooms with strict contamination protocols, food processing facilities needing corrosion-resistant sealed components, and any industrial operation where equipment uptime directly impacts profitability. When maintenance windows don’t exist and performance can’t be compromised, the Maintenance-Free Series delivers engineering reality: zero lubrication, maximum capacity, and operational reliability measured in years, not months.