How to Choose the Right Castor Wheel for Your Application
Load rating, wheel material, bearing type, and floor surface — the four factors that determine the correct castor for any industrial application.
Choosing the wrong castor is expensive. A wheel rated below the actual load fails prematurely. The wrong material marks or damages a finished floor. A plain-bore bearing on a high-cycle cart wears out in weeks.
This guide covers the four decisions every specification engineer needs to make.
1. Load Rating — Always Over-specify
Start with the total load of the cart or equipment, then divide by the number of castors. The result is the load per wheel — but don't buy to that number.
Apply a safety factor of 1.5–2×:
| Total equipment weight | Castors | Load/castor | Recommended rating |
|---|---|---|---|
| 400 kg | 4 | 100 kg | 150–200 kg |
| 1200 kg | 4 | 300 kg | 450–600 kg |
| 2000 kg | 4 | 500 kg | 750–1000 kg |
Dynamic loads from floor impacts, ramps, and abrupt stops can easily double the static load. The safety factor absorbs that without fatigue failure.
2. Wheel Material — Match the Environment
| Material | Load range | Best for | Avoid when |
|---|---|---|---|
| Polypropylene (PP) | 50–150 kg | Dry indoor, low cost | Wet areas, heavy loads |
| Polyurethane (PU) | 100–500 kg | Most industrial floors | High-temp (>60°C) |
| MC Nylon | 200–1000 kg | Heavy loads, oil/solvent contact | Sensitive floors (marks) |
| Phenolic | 100–300 kg | Ovens, hot environments (up to 230°C) | Smooth floors (hard, noisy) |
| Rubber / TPR | 50–200 kg | Noise-sensitive or delicate floors | Solvents, oil contamination |
PU is the default choice for most Malaysian factory and warehouse environments — it handles concrete and epoxy floors well, doesn't mark, and is available in ESD-safe formulations for cleanrooms.
3. Bearing Type — Match the Duty Cycle
The bearing determines how long the castor lasts under repetitive use:
- Plain bore — cheapest, suitable for occasional movement only (furniture, light shelf carts)
- Single ball bearing — good for moderate-use carts, common in retail and light manufacturing
- Double ball bearing — the industrial standard. Handles high cycle count, uneven floors, and side loads. Recommended for production line and warehouse carts
- Roller bearing — for very heavy loads (>500 kg) with directional movement (pallet trucks, heavy jigs)
If a cart is moved more than 20–30 times a day, specify double ball bearing as a minimum.
4. Floor Surface — Often Overlooked
| Floor type | Hardness concern | Marking concern | Recommended tread |
|---|---|---|---|
| Polished concrete | Low | High | PU or TPR |
| Epoxy-coated | Medium | High | PU |
| Vinyl / PVC tile | High | High | Soft PU or TPR |
| Raw concrete | Low | Low | PU or MC Nylon |
| Steel (dock plates) | Low | Low | PU or MC Nylon |
| Resin/seamless | Medium | Medium | PU |
A hard phenolic wheel on a vinyl tile floor will crack the tile. A soft PU wheel on a rough concrete floor degrades faster than MC Nylon but won't damage the surface.
Quick Specification Checklist
Before calling a supplier, have these answers ready:
- Total cart weight (loaded) in kg
- Number of castors (usually 4, sometimes 5 with a central castor)
- Floor type at origin, destination, and any ramps in between
- Temperature of the operating environment
- Any chemical exposure (oils, solvents, acids, cleaning agents)
- Cycle frequency (moves per shift)
- Any special requirements — ESD, food-grade, stainless steel, low noise
The more of these you can answer, the faster your supplier can specify the right product.
Need a recommendation for your specific application? Contact our technical team — we typically reply by the next working day.