Standard International Trade Classification
U.S. exports of Parts & Accessories for Measuring, Checking, Analysing & Controlling Machines and Instruments (NES) (SITC 87490) totaled $48.9M in August 2026.
Importers of Parts & Accessories for Measuring, Checking, Analysing & Controlling Machines and Instruments (NES) paid $1.6M in duties in August 2026, an average duty rate of 8.80% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Parts & Accessories for Measuring, Checking, Analysing & Controlling Machines and Instruments (NES) imports of $20.3M in August 2026 ran 29% above the year-to-date monthly average of $15.8M.
Last updated: August 2026 dataActing as the broadest residual parts heading in the SITC measurement and control instrument group, 87490 captures components and accessories for analytical, controlling, and measuring apparatus that are not more specifically provided for elsewhere in the schedule. This includes replacement subassemblies for process analyzers, flow controllers, and industrial automation sensors. The NES designation makes this a frequent landing point for complex multi-function assemblies, and trade professionals should conduct a thorough classification analysis to confirm no more specific parts heading applies before filing entry under 87490.
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997 import shipments a month
Because 87490 is a catch-all, CBP may challenge entries where a more specific parts heading exists, potentially resulting in reclassification, duty underpayment, and liquidation adjustments. A thorough review of the parent instrument's classification and the part's dedicated use is the standard practice before claiming the NES heading.
Embedded software that is integral to the hardware module and has no separate commercial value is generally treated as part of the hardware for classification purposes. However, separately invoiced software licenses or downloadable firmware updates are typically classified as software under a different SITC heading. The physical medium and invoicing structure both influence the correct classification.
Basic heading 67 of 419 in section 8
Basic heading 87490 · $48.9M of $18.4B
Exports · August 2026
destination
customs district
Census does not publish district detail for this classification system.
origin
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
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ImportsExports
Imports
$20.3MYoY · free account
Exports
$48.9MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $184.7M of Parts & Accessories for Measuring, Checking, Analysing & Controlling Machines and Instruments (NES).
Through August 2026 · exports 11 of 12 months reported. Source: U.S. Census Bureau.