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SITCSection 7
U.S. imports of non-numerically controlled grinding machines (nes, ≥0.01 mm accuracy) (SITC 73164) totaled $869K in April 2026, traded with 19 countries.
Importers of Non-Numerically Controlled Grinding Machines (NES, ≥0.01 mm Accuracy) paid $117K in duties in April 2026 — an effective duty rate of 13% on $869K 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 $869K in April 2026 ran 55% below the year-to-date monthly average of $1.9M.
Last updated: April 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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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.
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| KOREA, SOUTH | $404K | -- | -$404K |
| SPAIN | -- | $303K | +$303K |
| MEXICO | -- | $303K | +$303K |
| GERMANY | $121K | $125K | +$4K |
| CANADA | -- | $199K | +$199K |
Monthly import values over time