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HS Code 8409 covers parts suitable solely or principally for engines of heading 84.07 or 84.08 (internal combustion piston engines). The classification distinguishes between aircraft engine parts (8409.10) and other engine parts (8409.91-8409.99), with the latter divided between spark-ignition and compression-ignition engines. This critical mechanical components category includes precision-manufactured parts for the power generation core of vehicles, machinery, and equipment. Products range from simple gaskets to sophisticated fuel injection systems and cylinder heads. Manufacturing processes include casting, forging, machining, heat treatment, and various finishing operations to achieve required dimensional and performance specifications. Technical requirements focus on dimensional precision, material properties, surface finish, and durability under the extreme thermal and mechanical stresses of engine operation. This division represents both original equipment components for engine manufacturing and replacement parts for maintenance and repair, supporting the global transportation and power generation sectors with components that enable reliable internal combustion engine operation.