Medium Duty Plate Casters — 4" × 4-1/2" Plate

POPULAR INDUSTRIAL PLATE • MEDIUM DUTY

4" × 4-1/2" plate casters are a widely used industry standard for medium duty industrial carts, racks, and mobile equipment. This plate size balances mounting stability with broad compatibility across OEM and MRO applications.

Choose a Wheel Material

Mold-On Rubber Wheels Floor protection • quiet rolling • shock absorption Thermoplastic Rubber (TPR) Wheels Low noise • easy rolling • non-marking Polyurethane Wheels High capacity • abrasion resistant • long service life Polyurethane on Polyolefin Wheels Higher load • reduced flat-spotting Phenolic Wheels High load • oil and solvent resistance Nylon Wheels Hard rolling • low rolling resistance Polyolefin Wheels Chemical resistance • economical Blue Solid Poly Wheels Non-marking • food and wash-down areas Gray Metal Wheels Extreme durability • harsh environments Polyurethane on Iron (Red) Maximum capacity • industrial floors Polyurethane on Iron (Green) Heavy loads • reduced floor damage Polyurethane on Aluminum High capacity • corrosion resistance

Standard Configuration Envelope

Medium duty casters with 4 x 4-1/2 inch top plate, wheel diameters from 4 to 8 inches, and load capacities up to approximately 1250 pounds per caster.

Plate Size: 4" × 4-1/2" (industry standard)
Wheel Diameters: Typically 4"–8"
Load Capacity: Up to ~1,250 lb per caster (series dependent)
Swivel Construction: Double ball bearing raceway
Mounting Styles: Swivel, rigid, and brake options available

Selection tip: Capacity ratings assume evenly distributed loads on smooth floors. For thresholds, debris, or frequent impacts, upsizing wheel diameter or selecting polyurethane-on-metal cores improves service life.

Engineering & Application Guidance

Why the 4" × 4-1/2" plate is so common

This plate size provides an ideal balance between footprint area and mounting flexibility, allowing OEMs and MRO teams to standardize replacements without redesigning equipment frames.

Typical applications

Material handling carts and platform trucks
Warehouse racks and mobile fixtures
MRO and maintenance equipment
Industrial workstations and tooling carts

When to move up to heavy duty

If loads regularly exceed 1,000 lb per caster, or equipment is exposed to continuous shock, ramps, or uneven floors, heavy duty caster series may be required.

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