## Common ground
All options describe rivet nuts made from different metallic materials.
## Options at a glance
**7318.23 – Iron or steel**
- **Defining trait:** Highest strength and durability; commonly used in heavy-duty applications.
- **Typical examples:** Structural assemblies, automotive frames, industrial machinery.
- **Best fit when:** Strength and load-bearing capacity are critical.
**7415.33 – Copper**
- **Defining trait:** Excellent electrical conductivity and corrosion resistance.
- **Typical examples:** Electrical connectors, grounding systems, marine hardware.
- **Best fit when:** Conductivity or resistance to saltwater corrosion is needed.
**7508.90 – Nickel**
- **Defining trait:** High corrosion and heat resistance; often used in harsh environments.
- **Typical examples:** Aerospace components, chemical processing equipment.
- **Best fit when:** Exposure to high temperatures or corrosive chemicals.
**7616.10 – Aluminium**
- **Defining trait:** Lightweight with good corrosion resistance; easy to machine.
- **Typical examples:** Aircraft parts, consumer electronics, lightweight frames.
- **Best fit when:** Weight reduction is important without sacrificing durability.
**7907.00 – Zinc**
- **Defining trait:** Low cost and good corrosion protection via galvanization.
- **Typical examples:** Outdoor fixtures, fencing, low-stress fasteners.
- **Best fit when:** Budget-friendly solution with moderate corrosion resistance.
**8101.99 – Tungsten**
- **Defining trait:** Extremely high melting point and hardness; rare and expensive.
- **Typical examples:** High-temperature tools, specialized aerospace parts.
- **Best fit when:** Extreme heat or wear resistance is required (rare use for rivet nuts).
**8102.99 – Molybdenum**
- **Defining trait:** High thermal stability and strength at elevated temperatures.
- **Typical examples:** Rocket engines, furnace components.
- **Best fit when:** Extreme temperature environments.
**8104.90 – Magnesium**
- **Defining trait:** Lightest metal; prone to corrosion and flammability.
- **Typical examples:** Aerospace housings, portable devices.
- **Best fit when:** Weight is the top priority and environment is controlled.
**8108.90 – Titanium**
- **Defining trait:** Excellent strength-to-weight ratio and corrosion resistance.
- **Typical examples:** Medical implants, high-performance aircraft, marine hardware.
- **Best fit when:** High performance in demanding environments with weight constraints.
## Key differences
| Material | Strength | Weight | Corrosion Resistance | Cost & Availability |
|----------------|----------|--------|------------------------|---------------------|
| Iron/Steel | Very High | Medium | Moderate | Low |
| Copper | Medium | Medium | High | Medium |
| Nickel | High | Medium | Very High | High |
| Aluminium | Medium | Low | High | Medium |
| Zinc | Low | Medium | Moderate (via coating) | Very Low |
| Tungsten | Extreme | High | High | Very High |
| Molybdenum | High | Medium | High | High |
| Magnesium | Low | Very Low | Low | Medium |
| Titanium | High | Low | Very High | High |
## How to choose
- Is strength the top priority? → 7318.23 (steel)
- Does it need to conduct electricity or resist saltwater? → 7415.33 (copper)
- Is it exposed to high heat or chemicals? → 7508.90 (nickel) or 8102.99 (molybdenum)
- Is weight reduction critical? → 7616.10 (aluminium) or 8108.90 (titanium)
- Is cost the main concern? → 7907.00 (zinc)
## Overlaps & pitfalls
A rivet nut may fit multiple categories (e.g., titanium is strong, light, and corrosion-resistant). If unsure, prioritize the **main function**: structural strength, weight savings, or environmental resistance. No option is clearly dominant—choose based on the product’s primary use case