## Common ground
All options refer to chains and their components made from different metals.
## Options at a glance
**7315 – Iron or steel**
- **Defining trait:** Made primarily from iron or steel, offering high strength and durability.
- **Typical examples:** Industrial lifting chains, bicycle chains, security chains.
- **Best fit when:** High load-bearing capacity and resistance to wear are required.
**7419 – Copper**
- **Defining trait:** Made from copper, valued for conductivity and corrosion resistance.
- **Typical examples:** Electrical grounding chains, decorative chains in marine environments.
- **Best fit when:** The chain is used in electrical systems or corrosive environments where non-magnetic properties matter.
**7616.9X – Aluminium**
- **Defining trait:** Made from aluminium, known for being lightweight and corrosion-resistant.
- **Typical examples:** Lightweight suspension chains, aerospace components, outdoor decorative chains.
- **Best fit when:** Weight reduction is critical and strength needs are moderate.
## Key differences
| Feature | 7315 (Iron/Steel) | 7419 (Copper) | 7616.9X (Aluminium) |
|------------------|-------------------|-----------------|---------------------|
| Strength | Very high | Medium | Low to medium |
| Weight | Heavy | Medium | Light |
| Corrosion resistance | Low (unless coated) | High | Very high |
| Electrical use | Not suitable | Ideal | Not ideal |
## How to choose
- Is the chain used for heavy lifting or high-stress applications? → 7315
- Does it need to conduct electricity or resist saltwater corrosion? → 7419
- Is weight a major concern, and is strength less critical? → 7616.9X
## Overlaps & pitfalls
A chain may combine materials (e.g., aluminium with steel fittings), but the primary material determines classification. Copper chains can be used in non-electrical roles, but their main advantage lies in conductivity or corrosion resistance. If unsure, prioritize the **main functional purpose**—e.g., strength vs. weight vs. electrical use—over secondary traits