## Common ground
All options are dead-end clamps, used to secure cables or wires at the end of a run.
## Options at a glance
**3926.90 – Made of plastic material**
- **Defining trait:** Constructed from non-metallic, typically insulating plastic.
- **Typical examples:** PVC cable end clamps, nylon strain relief clamps.
- **Best fit when:** Used in electrical applications requiring insulation or in corrosive environments.
**7326.90 – Made of iron or steel**
- **Defining trait:** Made from ferrous metal, often with high strength and durability.
- **Typical examples:** Heavy-duty steel cable clamps, industrial mounting clamps.
- **Best fit when:** Required for rugged, high-tension applications or outdoor use.
**7508.90 – Made of nickel**
- **Defining trait:** Contains nickel, often used for corrosion resistance and high-temperature performance.
- **Typical examples:** Nickel-plated clamps in marine or aerospace settings.
- **Best fit when:** Exposure to extreme environments or where appearance and oxidation resistance matter.
**7616.99 – Made of aluminium**
- **Defining trait:** Lightweight, non-ferrous metal with good corrosion resistance.
- **Typical examples:** Lightweight cable clamps for automotive or HVAC systems.
- **Best fit when:** Weight reduction is important and moderate strength suffices.
## Key differences
| Feature | Plastic | Iron/Steel | Nickel | Aluminium |
|------------------|---------------|---------------|----------------|----------------|
| Weight | Light | Heavy | Medium | Very light |
| Corrosion resistance | Good (varies) | Poor (unless coated) | Excellent | Excellent |
| Strength | Low to medium | High | Medium | Medium |
| Electrical insulation | Yes | No | No | No |
## How to choose
- Is the clamp used in an electrical system requiring insulation? → 3926.90
- Does it need high strength and durability for heavy loads? → 7326.90
- Is it exposed to saltwater, chemicals, or high heat? → 7508.90
- Is weight a critical factor (e.g., in vehicles or aircraft)? → 7616.99
## Overlaps & pitfalls
A clamp may combine traits (e.g., aluminum with nickel plating), but the primary material determines classification. If unsure, prioritize the base material over coatings. No option is inherently more correct—choose based on the dominant material used in construction