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The Waterproof Thread Stem Medium Duty Industrial Caster Wheels (3", 4", 5") with PU Bearings is engineered for heavy-duty industrial applications, delivering reliable mobility and long-lasting performance across manufacturing lines, warehouses, and medical facilities. Designed to handle medium-duty loads (110–140KGS), this caster wheel features a waterproof thread stem and high-quality PU bearings—key advantages that ensure smooth rolling, minimal noise, and resistance to moisture damage. Its versatile 3”, 4”, and 5” size options fit various equipment, from material handling carts to assembly tables, making it a go-to solution for boosting operational efficiency in demanding environments.
This caster wheel combines durable materials and thoughtful engineering to meet industrial standards, with three core components:
Wheel Body Materials: Crafted from PP, PU, TPR, or Nylon, the wheel body offers exceptional abrasion resistance, impact tolerance, and compatibility with diverse surfaces (e.g., concrete floors, metal ramps). These materials also resist mild chemicals, making them suitable for light-cleaning environments like retail stockrooms.
PU Bearing Structure: Equipped with double PU bearings, the caster minimizes rolling resistance for effortless steering. The sealed bearing design blocks dust, water, and debris from entering—critical for maintaining smooth operation in damp or dusty areas (e.g., agricultural utility carts, outdoor storage yards).
Dimensional Specifications:
Wheel diameter: 75mm (3”), 100mm (4”), 125mm (5”)
Tread width: 32mm (consistent across all sizes)
Load height: 105mm (3”), 130mm (4”), 158mm (5”)
Mounting plate sizes: 9666mm or 7545mm; hole size: 8.5mm
Smooth & Quiet Operation: PU bearings reduce friction and noise, making the caster ideal for noise-sensitive spaces like hospitals or office supply closets.
Waterproof & Low-Maintenance: The sealed bearing and waterproof thread stem eliminate the need for frequent lubrication, cutting maintenance costs and extending the caster’s lifespan.
High Load Stability: The double-bearing structure and robust wheel body support 110–140KGS, meeting industrial-grade handling needs for heavy workpieces or stacked cargo.
Versatile Compatibility: Available in swivel (360° rotation) and rigid (fixed direction) types, with multiple mounting plate options to fit carts, racks, and storage tools in manufacturing, logistics, or food processing.
| Wheel Material | Wheel Dia | Tread Width | Load Height | Plate Size | Plate Size | Hole Size | Load Capacity |
| TPR/PU/PVC/PP | 75 (3") | 32 | 105 | 96*66 | 75*45 | 8.5 | 110 |
| 100 (4") | 32 | 130 | 96*66 | 75*45 | 8.5 | 125 | |
| 125 (5") | 32 | 158 | 96*66 | 75*45 | 8.5 | 140 |
Why choose PU bearings over standard steel bearings for this caster?
PU bearings offer better shock absorption and noise reduction than steel, while still providing sufficient load capacity. They also resist rust, making them more durable in humid environments (e.g., refrigeration units in food processing).
Can this waterproof caster wheel be used outdoors?
Yes. The sealed bearing design and weather-resistant wheel materials (e.g., Nylon, PU) protect against rain and dirt, making it suitable for agricultural feed transporters or outdoor equipment carts.
What is the maximum load for the 3” size, and is it enough for small material carts?
The 3” caster supports up to 110KGS—ideal for small material carts, tool trolleys, or retail display stands. For heavier loads (125–140KGS), opt for the 4” or 5” size.
Does the caster require any special cleaning to maintain its waterproof feature?
No. Simply wipe the wheel and thread stem with a damp cloth to remove dust or debris. The sealed bearings do not need disassembly for cleaning, ensuring low upkeep.
