The LD-430 polyurethane on cast iron caster wheel series represents the pinnacle of heavy-duty caster technology, combining the exceptional strength of cast iron with the superior performance characteristics of polyurethane to deliver a mobility solution that excels in the most demanding industrial environments. Each wheel features a solid cast iron core precision-machined for perfect concentricity and balance, with a high-quality polyurethane tire chemically bonded to the outer surface using an advanced adhesion process that ensures the PU will never delaminate or separate from the core even under extreme load and stress conditions. The result is a wheel that offers the structural integrity and heat dissipation of cast iron with the floor protection, quiet operation, and traction of polyurethane. The heavy-duty bracket is constructed from either cast steel or thick welded steel plate (6-10mm), designed to handle the massive loads this caster series supports. The swivel mechanism incorporates a double ball race design with heat-treated and ground raceways, using oversized hardened steel balls capable of supporting both radial and thrust loads well beyond standard caster ratings. For the highest load applications, the wheel bore is fitted with precision tapered roller bearings that distribute the load evenly across the bearing surfaces, providing exceptional durability and smooth rolling performance even under maximum load conditions. Load capacities range from 300kg per caster for the 100mm model up to an extraordinary 1500kg per caster for the 300mm heavy-duty model, making this series suitable for the heaviest industrial equipment and material handling applications. The polyurethane tread compound used in the LD-430 series is formulated for industrial performance, with a hardness of 90-95 Shore A that strikes the optimal balance between load capacity, wear resistance, and floor protection. Unlike standard polyurethane casters with plastic cores, the cast iron core provides superior heat dissipation, preventing heat buildup during continuous high-load operation that can cause PU softening and premature failure. The non-marking PU formulation ensures that no black marks or scuffs are left on warehouse floors, epoxy coatings, or other finished surfaces, maintaining a clean and professional facility appearance. Available in multiple colors including black, red, green, and blue, these casters can be color-coded for different departments or load ratings within a facility. Designed for ultra-heavy industrial applications such as aerospace manufacturing, automotive assembly lines, heavy machinery bases, die and mold transport, and large-scale distribution centers, the LD-430 series is built to perform reliably day after day under the most punishing conditions. The total lock brake mechanism uses a heavy-duty cam design that engages both the wheel and swivel simultaneously with positive locking force, ensuring that even the heaviest loads remain securely positioned on inclines or during loading operations. With their combination of cast iron strength, polyurethane performance, and heavy-duty construction, LD-430 casters are the premium choice for heavy industrial mobility requirements where failure is not an option.