U.S. imports of Numerically Controlled Grinding Machines (NES, ≥0.01 mm Accuracy) (SITC 73163) totaled $24.4M in August 2026, imported from 22 countries.
Importers of Numerically Controlled Grinding Machines (NES, ≥0.01 mm Accuracy) paid $2.7M in duties in August 2026, an average duty rate of 10.98% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataCNC grinding machines classified here combine programmable multi-axis control with a positioning accuracy of at least 0.01 mm, placing them among the higher-precision segments of the metalworking machine tool trade. The NES qualifier means these are grinding machines not captured by more specific headings — such as flat-surface or cylindrical grinders — making the classification a residual catch-all for specialized geometries including profile, gear, and thread grinders. Section 301 tariff exposure is a live concern for machines sourced from China, and importers should confirm current product coverage before contracting.
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61 import shipments a month
Profile grinders, gear grinders, thread grinders, and other specialized geometries that do not fit the flat-surface or cylindrical grinder headings are the most common candidates. If a machine's grinding action is defined by a complex programmed path rather than a simple planar or cylindrical motion, it is more likely to land in this residual NES category.
Yes. Origin is critical: machines manufactured in China may carry Section 301 tariff liability in addition to the standard MFN duty. Machines from countries with US free-trade agreements may receive preferential treatment, but origin must be substantiated with appropriate documentation such as a certificate of origin or manufacturer's declaration.
Basic heading 316 of 642 in section 7
Basic heading 73163 · $24.4M of $172.0B
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Imports · August 2026
origin
Japan and Switzerland together supply 53% 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
$24.4MYoY · free account
Exports
$6.3MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $262.8M of Numerically Controlled Grinding Machines (NES, ≥0.01 mm Accuracy).
Through August 2026 · exports 10 of 12 months reported. Source: U.S. Census Bureau.