Steam Turbine Generator Coupling
Steam turbine generator couplings are flexible disc or gear-type couplings that synchronize turbine and generator shafts for grid-stable operation, offering high misalignment tolerance for base-load power plants. These couplings are classified as 'other' parts under tariff item 8406.90.39, as they are not rotors, blades, or other specifically named turbine components.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the coupling is a general-purpose shaft coupling not specific to steam turbines
Clutches and shaft couplings of general use are classified under heading 84.83.
If the coupling is for repair or remanufacture of steam turbines
This item covers parts for repair or remanufacture, including couplings if specified.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Describe the coupling as a part of a steam turbine on customs documentation, specifying its function in power transmission
• If the coupling is imported separately from the turbine, ensure it is not classified as a general transmission shaft under heading 84.83
• Verify whether the coupling meets Canadian electrical safety standards if it includes any electrical components
Related Products under Tariff item 8406.90.39
Steam Turbine Bearing Housing
A bearing housing that encases and supports journal or thrust bearings in steam turbines, maintaining shaft alignment under high loads. It is a part of a steam turbine of heading 84.06, specifically for turbines of 8406.81.00 or 8406.82.00. As it is not a rotor, blade, or repair/remanufacture part, it falls under 8406.90.39 as 'other' parts.
Steam Turbine Bellows Expansion Joint
A multi-ply stainless steel bellows expansion joint that compensates for thermal expansion between turbine casing sections. It is a part of a steam turbine of heading 84.06, specifically for turbines of 8406.81.00 or 8406.82.00. As it is not a rotor, blade, or repair/remanufacture part, it falls under 8406.90.39 as 'other' parts.
Steam Turbine Blade Carrier Disc
Forged discs that serve as carriers for turbine blades, providing structural support in high-pressure stages of steam turbines. They are parts of a steam turbine of heading 84.06, specifically for turbines of 8406.81.00 or 8406.82.00. As they are not rotors, blades, or repair/remanufacture parts, they fall under 8406.90.39 as 'other' parts.
Steam Turbine Blade Locking Kit
Specialized pins, keys, and rivets that secure blades to turbine discs against centrifugal forces, sold as maintenance kits. They are parts of a steam turbine of heading 84.06, specifically for turbines of 8406.81.00 or 8406.82.00. As they are not rotors, blades, or repair/remanufacture parts, they fall under 8406.90.39 as 'other' parts.
Steam Turbine Coupling Shaft
High-strength forged shafts that connect turbine rotors to generators or loads, transmitting rotational power. They are parts of a steam turbine of heading 84.06, specifically for turbines of 8406.81.00 or 8406.82.00. As they are not rotors, blades, or repair/remanufacture parts, they fall under 8406.90.39 as 'other' parts.
Steam Turbine Diaphragm Staging
Steam turbine diaphragm staging assemblies consist of stationary diaphragm rings with precision-mounted guide vanes that direct steam flow onto the rotating blades for optimal energy extraction. These components are essential for controlling steam pressure and velocity through the turbine stages, and are classified as 'other' parts under tariff item 8406.90.39, distinct from rotors, blades, or casings.