## Common ground
All options are parts of articulated link chains, used for mechanical or industrial applications.
## Options at a glance
**7315.19 – Iron or steel**
- **Defining trait:** Made from ferrous metal with high tensile strength and durability.
- **Typical examples:** Chain links in heavy-duty lifting slings, conveyor systems.
- **Best fit when:** High load-bearing capacity and resistance to wear are required.
**7419 – Copper**
- **Defining trait:** Made from non-ferrous metal with excellent electrical conductivity and corrosion resistance.
- **Typical examples:** Electrical grounding chains, decorative chains in marine environments.
- **Best fit when:** Conductivity or resistance to oxidation is more important than strength.
**7616.9X – Aluminium**
- **Defining trait:** Made from lightweight, non-corrosive metal with moderate strength.
- **Typical examples:** Lightweight chains for aerial work platforms, marine buoyancy systems.
- **Best fit when:** Weight reduction and corrosion resistance are key priorities.
## Key differences
| Feature | 7315.19 (Iron/Steel) | 7419 (Copper) | 7616.9X (Aluminium) |
|---------------------|------------------------|-----------------------|------------------------|
| Material density | High | Medium | Low |
| Strength | Very high | Moderate | Moderate |
| Corrosion resistance| Low (unless coated) | Very high | Very high |
| Electrical conductivity | Low | Very high | Medium |
## How to choose
- Is the chain used in heavy lifting or high-stress environments? → 7315.19
- Does it need to conduct electricity or resist saltwater corrosion? → 7419
- Is weight reduction critical, and is moderate strength sufficient? → 7616.9X
## Overlaps & pitfalls
A chain may combine materials (e.g., copper-coated steel), but the primary material determines classification. Copper and aluminium chains can both resist corrosion, but only copper conducts electricity. If multiple traits apply, prioritize based on the **main function**: mechanical strength (steel), electrical use (copper), or lightness (aluminium)