Industrial Casters. Engineered for Spec.
Polyurethane on iron wheels bond a polyurethane tread to a cast or ductile iron core — combining poly's floor protection and chemical resistance with iron's structural strength. The standard heavy-duty polyurethane construction for industrial material handling, with load capacities up to 8,000 lb per wheel on the largest 12-inch sizes. Browse the wheel sizes below, then jump to a complete caster configuration that uses this wheel type.
Iron core delivers the highest load capacity of any polyurethane wheel construction — up to 8,000 lb per wheel vs ~1,500 lb for poly-on-aluminum and ~1,000 lb for solid polyurethane. Iron resists deformation under sustained load better than aluminum or solid poly. The trade-off: heavier per-wheel weight (12–85 lb depending on size). Pair with our heavy-duty caster yokes for material handling, tow lines, and OEM machinery.
Pick the rig type and mount: plate casters for industrial bolt-on (standard), swivel casters for steering ends, rigid casters for tracking ends, or total lock brake for medical and OEM safety. All configurations are built with poly-on-iron wheels in our heavy-duty range.
Above 8,000 lb per caster — that's the practical ceiling for poly-on-iron. Forged steel wheels handle 10,000–20,000 lb but lose polyurethane's floor protection. Spec forged steel only when load demands it; otherwise poly-on-iron is the higher-performing choice for industrial floors.
How heavy is a poly-on-iron wheel? 4″ ~5 lb · 8″ ~22 lb · 12″ ~70 lb. Wheel weight adds to total cart load.
Can I get a complete caster with this wheel? Yes — see /polyurethane-plate-casters for plate-mount complete casters using these wheels.
Can I retrofit a wheel onto an existing caster? Yes if the caster's axle dia and bearing bore match. Confirm specs before ordering replacement wheels.
FDA-compliant tread on iron core? Yes, available for food processing. Iron core is food-safe; specify FDA tread on quote.
How long do poly-on-iron wheels last? 3-5 years on smooth commercial concrete at 70% rated load; 12-18 months on abrasive concrete at 90% rated load.
Apply this rule when sizing the caster that will use this wheel type. Divide total cart weight by 3 (not 4) because uneven floors cause one caster to temporarily lift, redistributing load to the remaining three. Multiply by 1.25 for dynamic impact (rolling onto floor seams, dock plates). Pick the wheel core type whose load range covers your per-caster requirement.
| Wheel Core | Load/Wheel | Weight | Floor Protection | Best Use |
|---|---|---|---|---|
| Polyurethane on Iron Most Popular | 700–8,000 lb | Heaviest | Excellent | Heavy industrial, tow lines |
| Polyurethane on Aluminum | 250–1,500 lb | Light | Excellent | Aerospace, weight-sensitive |
| Solid Polyurethane | 300–1,000 lb | Medium | Excellent | General industrial, mid-load |
| Polyurethane on Polyolefin | 125–1,000 lb | Lightest | Excellent | Light-duty, chemical resistance |
Standardized 320 automotive plant tow-line carts on CasterHQ's 8-inch poly-on-iron wheels with kingpinless caster yokes. Three years in, zero failures vs the 12 we logged annually with our prior vendor. The iron core handles our 5,000 lb dock-plate impacts without measurable wear.
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These calculators apply to any caster application—even if you’re browsing a different category. Use them to estimate load rating per caster, select wheel material, and estimate push/pull force. Expand any tool for full analysis + a share-ready spec line.
Engineering Tools Hub
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Load Calculator (dedicated)
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Wheel Diameter Calculator
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Failure Diagnosis Tool
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