| HS Code | Official Doc | Tariff Rate | Origin | Destination | Effective Date |
|---|---|---|---|---|---|
| 8479899599 | Doc | 57.5% | CN | US | 2025-05-12 |
| 8487900080 | Doc | 83.9% | CN | US | 2025-05-12 |
| 8487900040 | Doc | 58.9% | CN | US | 2025-05-12 |
| 7308903000 | Doc | 80.0% | CN | US | 2025-05-12 |
| 7308906000 | Doc | 80.0% | CN | US | 2025-05-12 |
| 9406900190 | Doc | 82.9% | CN | US | 2025-05-12 |
| 9406900130 | Doc | 82.9% | CN | US | 2025-05-12 |
| 7326908688 | Doc | 82.9% | CN | US | 2025-05-12 |
| 7419800900 | Doc | 58.0% | CN | US | 2025-05-12 |
| 7419803000 | Doc | 58.0% | CN | US | 2025-05-12 |
| 7418100002 | Doc | 40.5% | CN | US | 2025-05-12 |
| 7418100025 | Doc | 40.5% | CN | US | 2025-05-12 |
Rudder Base
A rudder base is a critical component in marine steering systems, serving as the foundational structure to which the rudder is attached and through which steering motion is translated to the vessel. It facilitates the turning of a boat or ship by controlling the angle of the rudder in the water.
Material:
- Cast Iron: Historically common due to its strength and damping properties, though heavier.
- Steel: Offers higher strength-to-weight ratio than cast iron, often used in larger vessels.
- Aluminum Alloys: Used in smaller boats and racing yachts where weight reduction is paramount.
- Composite Materials: Increasingly used in high-performance applications to combine strength, stiffness, and low weight. Stainless steel is often incorporated for bearing surfaces.
Purpose:
The primary purpose of a rudder base is to securely hold the rudder stock and allow it to rotate, thereby changing the direction of water flow and generating steering torque. It must withstand significant hydrodynamic forces and loads from waves and maneuvering.
Function:
- Support: Provides a rigid mounting point for the rudder stock.
- Rotation: Allows the rudder stock to turn smoothly and accurately. This is achieved through bearings.
- Load Transfer: Transfers steering forces from the steering mechanism (e.g., steering wheel, autopilot) to the rudder.
- Sealing: Often incorporates seals to prevent water ingress into the hull.
- Shock Absorption: Damping mechanisms can be incorporated to reduce shock loads on the steering system.
Usage Scenarios:
- Sailboats: Integral to controlling the vessel's heading while sailing.
- Powerboats: Essential for maneuvering and maintaining course.
- Ships: Critical for large vessel navigation and control.
- Ferries & Trawlers: Robust bases are required for heavy-duty operation.
- Personal Watercraft: Smaller, lighter bases are used.
Common Types:
- Stocked Bases: The most common type, featuring a vertical stock (shaft) that the rudder attaches to. The stock rotates within bearings in the base.
- Trunnion Bases: Utilize horizontal bearings (trunnions) supporting the rudder. Less common in modern designs.
- Canting Bases: Found on canting keel yachts, allowing the keel (and rudder) to rotate to reduce heeling and improve performance.
- Articulated Bases: Allow for limited movement of the rudder relative to the hull, often used to improve maneuverability.
- Integrated Bases: Combine the base with other steering components, such as bearings and steering arms.
- Emergency Rudder Bases: Designed for quick installation in the event of main rudder failure. These are often simpler designs.
Based on the provided information, the following HS codes may be relevant to “rudder base”:
- 7308903000: Structures (excluding prefabricated buildings of heading 9406) and parts of structures (for example, bridges and bridge sections, lock gates, towers, lattice masts, roofs, roofing frameworks, doors and windows and their frames and thresholds for doors, shutters, balustrades, pillars and columns) of iron or steel; plates, rods, angles, shapes, sections, tubes and the like, prepared for use in structures, of iron or steel: Other: Columns, pillars, posts, beams, girders and similar structural units: Not in part of alloy steel.
- 73: Structures of iron or steel.
- 08: Structures and parts of structures.
- 90: Other. This subheading covers columns, pillars, posts, beams, girders, and similar structural units not made of alloy steel.
- 7308906000: Structures (excluding prefabricated buildings of heading 9406) and parts of structures (for example, bridges and bridge sections, lock gates, towers, lattice masts, roofs, roofing frameworks, doors and windows and their frames and thresholds for doors, shutters, balustrades, pillars and columns) of iron or steel; plates, rods, angles, shapes, sections, tubes and the like, prepared for use in structures, of iron or steel: Other: Columns, pillars, posts, beams, girders and similar structural units: Other.
- 73: Structures of iron or steel.
- 08: Structures and parts of structures.
- 90: Other. This subheading covers columns, pillars, posts, beams, girders, and similar structural units.
- 7326908688: Other articles of iron or steel: Other: Other: Other: Other Other.
- 73: Articles of iron or steel.
- 26: Other articles of iron or steel.
- 90: Other. This is a broad category for other articles of iron or steel.
Regarding HS code 7308903000 and 7308906000, please note that the material composition is important. If the rudder base is made of alloy steel, these HS codes are not applicable. Additionally, a total tax rate of 80.0% applies to both HS codes, with a base tariff of 0.0% and additional tariffs of 25.0% and 30.0% after April 2, 2025, plus a 25% additional tariff for steel or aluminum products.