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30 Series Casters – 900 Lbs Max Capacity – 4 x 4.5 Top Plate – Kingpin

Swivel Section: Made with cold forged, stamped out of 1/4 inch steel, the swivel section includes high-strength double row ball bearings in smooth stamped raceways. The raceways are not precision machined or heat treated.

Legs: 1/4 inch steel formed for strength

Kingpin: 5/8 inch diameter kingpin

Axle: 1/2 inch diameter

Wheel Diameter: 4 – 8 inches

Wheel Width: 1.5 – 2 inches

Overall Height: 5.63 – 9.5 inches

Swivel Lead: 1.38 – 2.38 inches


The 30 Series Kingpin Swivel Caster is a medium-duty line of casters designed and engineered for loads in the 250-900 lbs. range. The medium-duty line provides the user with a rugged caster at a lower price point. Carrying capacities will be very dependent on the wheel that is used in the application. Most medium-duty casters will use a light polyurethane wheel, a phenolic wheel, an injection molded wheel, a pneumatic tire, or a mold on rubber wheel.


Excellent for dollies, waste disposal trucks, warehouse trucks, food service equipment, proof or cooling racks, portable work benches, floor trucks, shop carts, drywall dollies, trailer frames, wire shelving units, tool boxes, laundry distribution carts, manual lifting devices, unitized dairy distribution carts and other medium duty applications. The medium duty line of casters is designed and built for manual applications and should not be used in powdered applications.

Custom CAD


Caster Concepts has a wide variety of caster options. Many of these not only improve function – but also provide safety and add longevity to the product. When considering safety options, the most common consideration would be caster locks, caster brakes, toe guards, and reinforced legs. Options that extend the life of a caster are primarily options that seal the bearing of the caster to prevent contamination of the precision parts.

Other options include threaded zerks for when an application is difficult and high level of maintenance is required and track brush wipers that keep debris from stopping movement or damaging a wheel. These options can be added at the time of manufacturing or after the caster is fully assembled.