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SITCSection 7
U.S. imports of thread rolling machines (SITC 73393) totaled $1.3M in April 2026, traded with 9 countries.
Importers of Thread Rolling Machines paid $182K in duties in April 2026 — an effective duty rate of 14% on $1.3M in dutiable value, based on actual customs collections rather than the published tariff schedule. Thread Rolling Machines imports of $1.3M in April 2026 ran 28% above the year-to-date monthly average of $996K.
Last updated: April 2026 dataThread rolling machines form screw threads by cold-plastic deformation rather than cutting, producing stronger, smoother threads with superior fatigue resistance — a key reason they dominate high-volume fastener and aerospace bolt manufacturing. The cold-forming process work-hardens the thread flanks, which is a specification requirement in many aerospace and automotive fastener standards. Importers should distinguish flat-die, cylindrical-die, and planetary-die configurations, as these represent different machine architectures that may affect HTS classification at the 10-digit level.
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Rolling displaces metal rather than removing it, aligning the grain structure along the thread profile and work-hardening the surface. The result is a thread with higher tensile and fatigue strength than a cut thread of the same nominal size — a critical advantage for aerospace, automotive, and structural fasteners subject to dynamic loading.
At the SITC level, all thread rolling machines for metal fall under 73393 regardless of die type. At the HTS 10-digit level, the applicable tariff schedule may distinguish by machine type or capacity, so importers should review the specific subheading with a licensed customs broker to confirm the correct classification for their machine's configuration.
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Monthly import values over time