U.S. imports of Non-Numerically Controlled Grinding Machines (NES, ≥0.01 mm Accuracy) (SITC 73164) totaled $3.6M in August 2026, imported from 23 countries.
Importers of Non-Numerically Controlled Grinding Machines (NES, ≥0.01 mm Accuracy) paid $245K in duties in August 2026, an average duty rate of 6.79% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Non-Numerically Controlled Grinding Machines (NES, ≥0.01 mm Accuracy) imports of $3.6M in August 2026 ran 95% above the year-to-date monthly average of $1.8M.
Last updated: August 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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34 import shipments a month
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.
Basic heading 499 of 642 in section 7
Basic heading 73164 · $3.6M of $172.0B
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Imports · August 2026
origin
Germany and Japan together supply 70% of it. Germany pays 10.0% duty; Japan 0.0%.
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
$3.6MYoY · free account
Exports
$517KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $21.8M of Non-Numerically Controlled Grinding Machines (NES, ≥0.01 mm Accuracy).
Through August 2026 · exports 10 of 12 months reported. Source: U.S. Census Bureau.