| HS Code | Official Doc | Tariff Rate | Origin | Destination | Effective Date |
|---|---|---|---|---|---|
| 8487900080 | Doc | 83.9% | CN | US | 2025-05-12 |
| 8487900040 | Doc | 58.9% | CN | US | 2025-05-12 |
| 9021100050 | Doc | 30.0% | CN | US | 2025-05-12 |
| 9021100090 | Doc | 30.0% | CN | US | 2025-05-12 |
| 7320103000 | Doc | 83.2% | CN | US | 2025-05-12 |
| 7320106060 | Doc | 83.2% | CN | US | 2025-05-12 |
| 8538908160 | Doc | 58.5% | CN | US | 2025-05-12 |
| 8538903000 | Doc | 58.5% | CN | US | 2025-05-12 |
| 8535908060 | Doc | 57.7% | CN | US | 2025-05-12 |
| 8535904000 | Doc | 57.7% | CN | US | 2025-05-12 |
| 8548000000 | Doc | 55.0% | CN | US | 2025-05-12 |
Butt Spring
A butt spring, also known as a seat spring or a coil spring seat, is a mechanical component designed to provide cushioning and support for seating applications, particularly in vehicles, industrial equipment, and occasionally furniture.
Material:
- Spring Steel: The most common material due to its high elasticity, durability, and resistance to fatigue. Different grades of spring steel are used based on the load requirements and desired lifespan.
- Stainless Steel: Employed in applications requiring corrosion resistance, such as marine environments or outdoor equipment.
- Fiberglass: Less common, used in specialized applications where weight reduction is critical.
Purpose:
The primary purpose of a butt spring is to absorb shocks and vibrations, improving ride comfort and reducing stress on the seat frame and occupant. They isolate the occupant from the movement of the vehicle or equipment base.
Function:
Butt springs function by compressing and expanding in response to applied force. This compression stores energy, which is then released as the force is removed, providing a rebounding effect. The spring rate (stiffness) determines the amount of force required to compress the spring a given distance.
Usage Scenarios:
- Vehicle Seating: Commonly found in truck seats, tractor seats, forklift seats, and construction equipment seats.
- Industrial Equipment: Used in operator chairs for machinery and equipment where vibration is a concern.
- Furniture: Occasionally used in certain types of chairs to provide enhanced comfort or support.
- Suspension Systems: Smaller butt springs can be integrated into simple suspension systems for lightweight applications.
Common Types:
- Coil Springs: The most prevalent type, consisting of a wound coil of spring steel. Variations include:
- Single Coil Springs: A basic design with a single coil.
- Double Coil Springs: Offer increased load capacity and stability.
- Variable Spring Rate Springs: Designed with varying coil diameters to provide different levels of support at different compression levels.
- Leaf Springs: Less common in seating, but can be used in heavier-duty applications. Consists of multiple layers of spring steel.
- Air Springs: Utilize compressed air to provide cushioning and adjustable support. Offer superior comfort but are more complex and expensive.
- Rubber Springs: Employ rubber or elastomer materials for vibration damping and cushioning. Suitable for lighter loads and less demanding applications.
Based on the provided information, “butt spring” can be interpreted as a spring used in vehicle suspension. Here are the relevant HS codes and explanations:
-
7320103000: Springs and leaves for springs, of iron or steel: Leaf springs and leaves therefor: Suitable for motor vehicle suspension: To be used in motor vehicles having a G.V.W. not exceeding 4 metric tons. This code specifically covers leaf springs designed for vehicles with a Gross Vehicle Weight (G.V.W.) of 4 metric tons or less.
- 73: Iron or steel articles.
- 20: Springs and leaves for springs, of iron or steel.
- 10: Leaf springs and leaves therefor.
- 30: Suitable for motor vehicle suspension: To be used in motor vehicles having a G.V.W. not exceeding 4 metric tons.
-
7320106060: Springs and leaves for springs, of iron or steel: Leaf springs and leaves therefor: Suitable for motor vehicle suspension: Other Other. This code covers leaf springs for vehicle suspension that do not fall under the G.V.W. restriction of HS code 7320103000.
- 73: Iron or steel articles.
- 20: Springs and leaves for springs, of iron or steel.
- 10: Leaf springs and leaves therefor.
- 60: Suitable for motor vehicle suspension: Other Other.
Regarding HS codes 7320103000 and 7320106060, please note that both have a combined tariff rate of 83.2%. This includes a basic tariff of 3.2%, an additional tariff of 25.0%, and a further additional tariff of 30.0% effective after April 2, 2025. Additionally, a 25% additional tariff applies to steel and aluminum products.