## Common ground
All options refer to seat fittings used in motor vehicles, which are structural components that secure seats to the vehicle floor or frame.
## Options at a glance
**3926.30 – Made of plastic material**
- **Defining trait:** Constructed primarily from synthetic polymer materials (e.g., polypropylene, nylon).
- **Typical examples:** Plastic seat rails, plastic mounting brackets, plastic anchor fittings.
- **Best fit when:** The fitting is lightweight, injection-molded, and not intended for high-load or high-temperature environments.
**8302.42 – Made of base metal**
- **Defining trait:** Constructed from ferrous or non-ferrous metals (e.g., steel, aluminum) with no significant plastic content.
- **Typical examples:** Steel seat rails, metal mounting brackets, aluminum seat anchors.
- **Best fit when:** The fitting must withstand high mechanical stress, vibration, or extreme conditions (e.g., in commercial vehicles or safety-critical applications).
## Key differences
| Feature | 3926.30 (Plastic) | 8302.42 (Base Metal) |
|---------------------|--------------------------|----------------------------|
| Material | Synthetic polymer | Ferrous/non-ferrous metal |
| Weight | Lighter | Heavier |
| Load capacity | Lower | Higher |
| Durability under stress | Moderate | High |
## How to choose
- Is the fitting made primarily of plastic (e.g., molded, lightweight)? → 3926.30
- Is the fitting made of steel, aluminum, or other metal (e.g., stamped, welded, robust)? → 8302.42
## Overlaps & pitfalls
A seat fitting may contain both plastic and metal parts (e.g., a metal core with plastic bushings). In such cases, the **main structural material** determines the classification. If unclear, prioritize based on the **primary load-bearing component**. No option is inherently more accurate—choose based on the dominant material in function and construction