Mechanical Ash Discharger Screw
> A mechanical ash discharger screw is a helical screw conveyor for automatic ash removal from furnace bottoms, made of corrosion-resistant alloy. It is a part of mechanical ash dischargers of heading 84.16, which are similar appliances to mechanical stokers. As a part of such appliances, it is classified under tariff item 8416.90.00.
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 screw is a general conveyor screw for non-furnace applications
General conveyor screws may be classified as structures or parts of structures.
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
• > Declare the screw as a part of mechanical ash dischargers, not as a general conveyor screw, by providing specs showing its design for furnace ash removal
• If the screw is imported with a drive shaft or bearings, declare them as part of the screw if integral
• Keep documentation of the furnace or stoker model to support the classification
Related Products under Tariff item 8416.90.00
Burner Flame Sensor Assembly
> A burner flame sensor assembly detects the presence of a flame in gas or oil furnace burners, using a UV or flame rod sensor to ensure safe shutdown if the flame is lost. It is an integral safety component of burner control systems, designed specifically for use with furnace burners of heading 84.16. As a part solely for such burners, it is classified under tariff item 8416.90.00.
Burner Management System Mounting Bracket
> A precision-machined mounting bracket secures electronic burner controls to the furnace burner housing, designed to withstand vibration and heat. It is a mechanical part exclusively for furnace burners of heading 84.16, contributing to their safe and stable operation. As a part of such burners, it is classified under tariff item 8416.90.00.
Burner Sequence Controller Housing
> A die-cast aluminum enclosure protects burner control electronics from heat and vibration in furnace environments, with a gasketed design for NEMA 4X protection. It is a mechanical housing specifically for burner control systems of heading 84.16, serving as a protective part of the burner. As a part of furnace burners, it is classified under tariff item 8416.90.00.
Coal Burner Air Register
> A coal burner air register is an adjustable damper assembly that controls primary and secondary air flow to pulverized coal burners, critical for flame stability and combustion efficiency. It is designed specifically for solid fuel burners of heading 84.16, functioning as a mechanical part of the burner. As a part of furnace burners for pulverized solid fuel, it is classified under tariff item 8416.90.00.
Dual Fuel Burner Mixing Tube
> A dual fuel burner mixing tube is a stainless steel tube that mixes gas and air streams for efficient combustion in dual-fuel burners, with precision-drilled holes for optimal flow. It is a component designed specifically for burners of heading 84.16, enabling the mixing function essential to burner operation. As a part of furnace burners for gas or liquid fuel, it is classified under tariff item 8416.90.00.
Furnace Burner Refractory Tile
> A furnace burner refractory tile is a high-alumina tile lining the burner throat area, exposed to extreme flame temperatures and custom-contoured for airflow. It is a protective part of furnace burners of heading 84.16, ensuring thermal insulation and flame stability. As a part of such burners, it is classified under tariff item 8416.90.00.