Cast Iron Marine Piston Casting
Rough cast iron piston blank designed exclusively for spark-ignition marine propulsion engines, machined only to remove casting imperfections and permit finishing. Produced from high-strength cast iron alloy suitable for marine environments, this part falls under HTS 8409.91.10.60 due to its principal use with heading 8407/8408 engines and limited post-casting processing.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If made of steel instead of cast iron
Steel parts for marine spark-ignition engines fall under separate steel provisions in the same subheading.
If machined beyond rough cleaning to final tolerances
Finished machined pistons are classified as transmission crankshafts/pistons rather than rough castings.
If for general automotive/industrial use, not marine-specific
Parts not principally for marine propulsion classified under broader pump/transmission parts headings.
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Import Tips & Compliance
• Verify engine compatibility documentation proving marine propulsion use; ensure casting composition meets USCG material standards; avoid over-machining which reclassifies to finished parts
Related Products under HTS 8409.91.10.60
Marine Crankshaft Rough Casting
Cast iron crankshaft blank for spark-ignition outboard/inboard marine engines, with minimal machining only for gate removal and fixturing. Specifically engineered for high-RPM marine duty cycles, classified under 8409.91.10.60 as a cast-iron part principally for 8407/8408 marine engines.
Outboard Motor Cylinder Head Casting
Rough cast iron cylinder head for spark-ignition marine outboard engines, cleaned and machined solely for casting defect removal. Designed with marine-specific cooling passages, this part is suitable principally for 8408 marine propulsion engines per HTS 8409.91.10.60.
Inboard Engine Block Rough Casting
Cast iron engine block casting for spark-ignition inboard marine propulsion engines, with gates/risers removed and minimal location machining. Principal use with heading 8407/8408 engines justifies 8409.91.10.60 classification for marine-specific rough castings.
Sterndrive Mounting Bracket Casting
Rough cast iron bracket for mounting spark-ignition sterndrive marine propulsion systems, machined only for casting cleanup. Essential structural component principally used with 8408 marine engines, classified under HTS 8409.91.10.60 marine provisions.
Marine Exhaust Manifold Casting
Cast iron rough casting for spark-ignition marine engine exhaust manifolds, with sprues removed and water jacket passages roughed in. Water-cooled design specific to marine propulsion qualifies for HTS 8409.91.10.60 classification.
Propulsion Engine Flywheel Casting
Rough cast iron flywheel blank for high-torque marine spark-ignition propulsion engines, cleaned and center-bored only for finishing fixturing. Heavy-section design for marine propeller loads qualifies under 8409.91.10.60.