## Common ground
All options refer to bearing wheels—circular components that reduce friction and enable smooth motion in machinery or vehicles.
## Options at a glance
**3926.90 – Made of plastic material**
- **Defining trait:** Constructed primarily from synthetic polymers (e.g., nylon, polyethylene).
- **Typical examples:** Plastic casters on office chairs, lightweight wheels for trolleys.
- **Best fit when:** Low weight, corrosion resistance, or quiet operation is needed; not for heavy loads.
**8302.20 – Made of base metal**
- **Defining trait:** Fabricated from ferrous or non-ferrous metals (e.g., steel, brass).
- **Typical examples:** Industrial rollers, heavy-duty warehouse trolley wheels, machine bearings.
- **Best fit when:** High load capacity, durability, and resistance to wear are essential.
## Key differences
| Feature | 3926.90 (Plastic) | 8302.20 (Base Metal) |
|------------------|--------------------------|----------------------------|
| Material | Synthetic polymer | Iron, steel, or other metal |
| Load capacity | Low to medium | High |
| Durability | Moderate (prone to wear) | High |
| Noise level | Quiet | Can be noisy |
## How to choose
- Is the wheel intended for light-duty use (e.g., office furniture)? → 3926.90
- Does it need to support heavy loads or withstand harsh conditions? → 8302.20
## Overlaps & pitfalls
A bearing wheel may combine plastic and metal parts (e.g., metal axle in a plastic hub), but the primary material determines classification. If unclear, prioritize the **main structural material**—the one that defines the wheel’s function and durability. Do not assume plastic wheels are always lighter; some reinforced types can be heavy