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SITCSection 7
U.S. imports of non-numerically controlled grinding machines (nes, ≥0.01 mm accuracy) (SITC 73164) totaled $2.1M in July 2026, traded with 22 countries.
Importers of Non-Numerically Controlled Grinding Machines (NES, ≥0.01 mm Accuracy) paid $228K in duties in July 2026 — an effective duty rate of 11% on $2.1M in dutiable value, based on actual customs collections rather than the published tariff schedule. Non-Numerically Controlled Grinding Machines (NES, ≥0.01 mm Accuracy) imports of $2.1M in July 2026 ran 30% above the year-to-date monthly average of $1.6M.
Last updated: July 2026 dataOccupying the residual slot for manually or conventionally controlled precision grinders, this heading captures metalworking grinding machines that meet the 0.01 mm accuracy threshold but lack numerical control and do not fit a more specific SITC category. Machines such as conventional profile grinders and specialty surface finishers used in aerospace tooling, medical device manufacturing, and precision mold work commonly fall here. Accurate classification hinges on two simultaneous tests: confirming the absence of NC control and verifying that the machine's positioning system meets the stated accuracy floor.
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25 shipments/mo
Basic heading 73164 · $2.1M of $175.6B
Generally yes — a digital readout (DRO) that displays position without executing stored programs is not considered numerical control for classification purposes. The machine must actively execute a programmed sequence of movements to be classified as numerically controlled. Manufacturer documentation clarifying the control architecture is the best supporting evidence.
If the machine's specifications are borderline, obtain a formal calibration certificate or ISO accuracy test report from the manufacturer. CBP may request this documentation during examination. If accuracy cannot be confirmed at 0.01 mm, the machine would fall into a lower-precision heading, which can carry different duty implications.
Supplier Network
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Imports · July 2026
origin
Italy and Switzerland together supply 76% of it.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$2.1MYoY · Pro
Exports
$1.3MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.