## Common ground
All options are suspension clamps, used to secure and support cables, pipes, or conduits in place.
## Options at a glance
**3926.90 – Plastic material**
- **Defining trait:** Made from non-metallic, typically insulating plastic (e.g., polyethylene, PVC).
- **Typical examples:** Plastic cable ties with clamping arms, insulated conduit holders.
- **Best fit when:** Used in electrical installations where insulation is critical or in corrosive environments.
**7326.90 – Iron or steel**
- **Defining trait:** Made from ferrous metal, often galvanized for corrosion resistance.
- **Typical examples:** Heavy-duty steel pipe clamps, industrial cable supports.
- **Best fit when:** High strength and load-bearing capacity are needed in structural or outdoor settings.
**7508.90 – Nickel**
- **Defining trait:** Made from nickel or nickel alloys, known for high corrosion resistance and heat tolerance.
- **Typical examples:** Clamps for chemical plants, aerospace applications, or high-temperature environments.
- **Best fit when:** Extreme environmental conditions (e.g., saltwater, acids, high heat) require superior material durability.
**7616.99 – Aluminium**
- **Defining trait:** Made from lightweight, corrosion-resistant aluminum alloy.
- **Typical examples:** Lightweight cable clamps for HVAC systems, solar panel mounts.
- **Best fit when:** Weight reduction is important and moderate strength suffices.
## Key differences
| Feature | Plastic (3926.90) | Steel (7326.90) | Nickel (7508.90) | Aluminium (7616.99) |
|------------------|-------------------|-----------------|------------------|----------------------|
| Weight | Light | Heavy | Medium-heavy | Very light |
| Corrosion resistance | Good (insulating) | Moderate (if galvanized) | Excellent | Excellent |
| Strength | Low to medium | High | High | Medium |
| Electrical insulation | Yes | No | No | No |
## How to choose
- Is the clamp used in an electrical system where insulation matters? → 3926.90
- Does it need to support heavy loads or withstand high stress? → 7326.90
- Is it exposed to harsh chemicals, saltwater, or extreme heat? → 7508.90
- Is weight a concern (e.g., rooftop, mobile systems)? → 7616.99
## Overlaps & pitfalls
A clamp may combine materials (e.g., aluminum body with plastic insert), but the primary material determines classification. If unsure, prioritize the **main structural material**. Nickel and aluminum both resist corrosion, but nickel is stronger and more expensive—choose based on environment and load needs