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SITCSection 7
U.S. imports of parts for compression-ignition internal combustion piston engines, n.e.s. (SITC 71392) totaled $328.9M in April 2026, traded with 81 countries.
Importers of Parts for Compression-Ignition Internal Combustion Piston Engines, N.E.S. paid $67.9M in duties in April 2026 — an effective duty rate of 25% on $273.7M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataComponents designed for use solely or principally with diesel and semi-diesel compression-ignition engines — such as fuel injection systems, turbocharger housings, diesel-specific pistons, and cylinder liners — are essential inputs for the commercial vehicle, agricultural, construction, and marine industries. Classification here requires confirming that the part's primary application is a compression-ignition engine rather than a spark-ignition one, with the 'solely or principally' test applied the same way as for SITC 71391. Given the breadth of diesel engine applications across sectors, this heading sees substantial trade volume in both OEM supply chains and the independent aftermarket.
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Fuel injectors and common-rail components designed principally for diesel engines are generally classified under SITC 71392 as parts suitable for use with compression-ignition engines. However, complete fuel injection pumps or systems may have their own specific classification depending on how they are presented and their degree of assembly. Importers handling high-value injection system components should consider requesting a CBP binding ruling to confirm the correct heading.
Useful documentation includes the manufacturer's technical data sheet specifying the compatible engine type, the OEM application guide or fitment list, purchase orders referencing diesel engine models, and any emissions certification paperwork associated with the parent engine. When a part is marketed exclusively for diesel applications, that commercial context is strong evidence for classification under SITC 71392 rather than the spark-ignition parts heading.
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Monthly import values over time