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Super-duty standard plate casters have forged steel frames, tapered roller thrust bearings, and forged steel kingpins. They can bear heavier loads, tolerate more frequent use, and withstand more shock and impact from rolling over rough or uneven ground than light-duty, medium-duty, heavy-duty, and extra-heavy-duty standard plate casters. The casters are attached to the bottom of die carts and other heavy equipment used in shipbuilding sites, aerospace plants, automotive factories, steel mills, heavy equipment manufacturers, and other industrial operations. Swivel versions of these casters have roller load bearings or large-diameter double swivel ball bearings, which are quieter and allow the caster to swivel more smoothly than roller bearings. Standard plate casters have kingpins that securely join the casters' mounting plates to their frames. They are used in nearly every industry and are the most common type of caster used for general purpose applications. The casters' mounting plates install onto the bottom of machinery, carts, or other equipment, and the casters allow the equipment to roll to reduce effort when moving or repositioning it. These casters are available in swivel and rigid versions. The swivel casters can rotate 360°, allowing equipment to change directions while rolling. The rigid casters roll in a straight line. Two rigid plate casters will often be paired with two swivel casters to allow the equipment to both maneuver around curves and obstacles and maintain a straight course while rolling. This listing is for each. This item requires special shipping, additional charges may apply. Technical Specification Item Standard Plate Caster Caster Sub-Type Swivel Swivel Construction Kingpin Load Rating 6000 lb Wheel Dia. 12 in Wheel Width 4 in Mounting Height 15 1/2 in Wheel/Tread Material Polyurethane Wheel/Tread Hardness Rating Firm Wheel/Tread Hardness 95 Shore A Wheel/Tread Color Blue Wheel Bearing Type Tapered Roller Swivel Raceway Type