## Common ground
All options are mounting fittings or similar articles used in motor vehicles, regardless of material.
## Options at a glance
**3926.30 – Made of plastic material**
- **Defining trait:** Constructed primarily from plastic (e.g., polypropylene, ABS).
- **Typical examples:** Plastic engine mounts, dashboard brackets, air intake tube clamps.
- **Best fit when:** The component is lightweight, non-metallic, and designed for vibration damping or cost efficiency.
**8302.30 – Made of base metal**
- **Defining trait:** Constructed from ferrous or non-ferrous metals (e.g., steel, aluminum).
- **Typical examples:** Metal engine brackets, suspension mounting bolts, chassis fixings.
- **Best fit when:** The part requires high strength, heat resistance, or durability under heavy load.
## Key differences
| Feature | 3926.30 (Plastic) | 8302.30 (Base Metal) |
|---------------------|--------------------------|----------------------------|
| Material | Plastic (non-metallic) | Iron, steel, aluminum |
| Strength & Durability | Lower | High |
| Weight | Light | Heavier |
| Thermal Resistance | Moderate | High |
## How to choose
- Is the fitting made of plastic? → 3926.30
- Is it made of steel, aluminum, or another base metal? → 8302.30
## Overlaps & pitfalls
A mounting may use both plastic and metal parts (e.g., a metal bolt with a plastic washer), but the **primary material** determines classification. If unclear, prioritize the component’s main structural material. No option is vague—both are well-defined by material type