## Common ground
All options are types of transmission belts or belting, used to transfer power between rotating shafts.
## Options at a glance
**3926.90 – Plastic material**
- **Defining trait:** Made primarily from synthetic polymers like polyurethane or nylon.
- **Typical examples:** Timing belts, flat plastic belts for light machinery.
- **Best fit when:** High resistance to wear, low maintenance, and use in clean environments (e.g., office printers, lab equipment).
**4010.3X – Rubber**
- **Defining trait:** Made from natural or synthetic rubber; flexible and shock-absorbing.
- **Typical examples:** V-belts, flat rubber belts for industrial motors.
- **Best fit when:** High torque transmission, vibration damping, or use in heavy-duty machinery.
**4205.00 – Leather or composition leather**
- **Defining trait:** Made from animal hide or synthetic leather-like materials; historically used for high-tension applications.
- **Typical examples:** Vintage conveyor belts, old-style drive belts.
- **Best fit when:** Traditional or decorative use; rare in modern industrial settings.
**5910.00 – Textile material**
- **Defining trait:** Reinforced with fabric (e.g., cotton, polyester); lightweight and flexible.
- **Typical examples:** Flat belts for small machines, textile-reinforced timing belts.
- **Best fit when:** Low-load applications, need for flexibility, or use in non-industrial settings.
**7326.90 – Iron or steel**
- **Defining trait:** Made from metal; extremely durable and used in high-stress environments.
- **Typical examples:** Chain belts, metallic conveyor belts in mining or heavy industry.
- **Best fit when:** Extreme durability, high load capacity, or use in harsh conditions.
## Key differences
| Feature | Plastic | Rubber | Leather | Textile | Iron/Steel |
|------------------|-------------|-------------|---------------|-------------|---------------|
| Material | Synthetic polymer | Natural/synthetic rubber | Animal/hide or synthetic leather | Fabric (cotton, polyester) | Metal (iron/steel) |
| Flexibility | Moderate | High | Medium | High | Low |
| Load capacity | Low–medium | Medium–high | Low | Low | Very high |
| Common use | Light machinery | Industrial motors | Vintage systems | Small devices | Heavy industry |
## How to choose
- Is the belt made of synthetic polymer (e.g., polyurethane)? → 3926.90
- Does it contain rubber and absorb shocks? → 4010.3X
- Is it made from animal hide or leather-like material? → 4205.00
- Is it fabric-reinforced (e.g., cotton or polyester)? → 5910.00
- Is it metal (iron/steel) and used in heavy-duty settings? → 7326.90
## Overlaps & pitfalls
A belt may combine materials (e.g., rubber with textile reinforcement), but the **primary material** determines the HS Code. If uncertain, prioritize the main structural material. No option is clearly defined by function alone—material is key