Product classification

HS code for Engine test stand: 9031.20

Test benches.

Classification of engine test stand under HS 9031.20

The classification of an engine test stand under HS code 9031.20 is determined by its primary function as a specialized apparatus designed to measure, check, and verify the performance characteristics of internal combustion engines. According to the General Rules of Interpretation (GRI), specifically GRI 1, products are classified according to the terms of the headings and any relative section or chapter notes. Chapter 90 encompasses instruments and apparatus for measuring or checking. Within this chapter, heading 9031 is a residual heading for measuring or checking instruments, appliances, and machines not specified or included elsewhere in Chapter 90. Subheading 9031.20 specifically identifies "test benches." An engine test stand qualifies as a test bench because it provides a controlled environment where an engine can be mounted and operated while various sensors and instruments capture data such as torque, horsepower, fuel consumption, and exhaust emissions. These stands are distinct from simple mounting brackets because they incorporate the measuring and checking mechanisms necessary for technical evaluation. The stand typically includes a dynamometer to apply load, a cooling system interface, and a control console for data acquisition, all of which function together as a single unit for testing purposes.

Covers
  • Engine dynamometer test stands
  • Diesel engine test benches
  • Turbocharger test stands
  • Automotive engine performance testing units
  • Aeronautical engine test cells (portable or fixed)
Also under 9031.20
  • AVL Test Systems
  • FEV Test Systems
  • Horiba Test Systems
  • DynoJet (industrial dynamometers)

Codes often confused with 9031.20

Common mistake. Engine test stands are frequently misclassified under HS code 9031.80, which covers "other" measuring or checking instruments. However, because 9031.20 specifically names "test benches," it must be used according to the principle of specificity. Another common error is attempting to classify the stand under heading 8479 as a machine with an individual function. Section XVIII (Chapter 90) generally takes precedence over Section XVI (Chapter 84) for specialized testing equipment. Additionally, if a dynamometer is imported separately without the frame and control systems of a stand, it might be classified under 9031.80, but the complete stand remains in 9031.20.

9031.80Instruments, appliances and machines; for measuring or checking n.e.c. in chapter 9084.79Machinery and mechanical appliances; having individual functions, n.e.c. in this chapter

Top exporters and importers of HS 903120 (the code used for engine test stand), 2025

In 2025, the largest exporter of HS 903120 (the code used for engine test stand) in UN Comtrade data was Germany, with 29% of world exports; the largest importer in UN Comtrade data was China, with 19% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.

Figures cover everything classified under HS 903120, not only engine test stand.

Top exporters 2025 · share of world exports

  1. 1 Germany $557M
  2. 2 Italy $226M
  3. 3 Austria $166M

World total: $1.9B Reported figures on UN Comtrade ↗

Top importers 2025 · share of world imports

  1. 1 China $289M
  2. 2 United States $208M
  3. 3 India $85M

World total: $1.6B Reported figures on UN Comtrade ↗

How these figures are built

109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).

Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.

Brazil NCM codes for engine test stand

Brazil splits HS 9031.20 into 2 NCM codes. Pick the one that matches your product:

Source: Siscomex NCM table, updated Oct 2026. The Portuguese text on each NCM page is the official one.

Questions about engine test stand

What is the HS code for Engine test stand?

The HS code for Engine test stand is 903120 (Test benches). The HS code for an engine test stand is 9031.20, which falls under the category of test benches within the measuring and checking instruments chapter.

How do I classify Engine test stand for customs?

Engine test stand is classified under HS code 903120 — Test benches. This is a 6-digit subheading level code.

Does this code include software for the test stand?

If the software is pre-installed on the hardware or provided on media accompanying the stand, it is generally classified with the apparatus. Standalone software updates may be classified under heading 8523.

Which countries are the top exporters of engine test stand (HS 903120)?

In 2025, the top exporters of HS 903120 (the code used for engine test stand) in UN Comtrade data were Germany ($557M, 29% of world exports), Italy ($226M) and Austria ($166M). World exports came to about $1.9B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

Which countries are the top importers of engine test stand (HS 903120)?

In 2025, the top importers of HS 903120 (the code used for engine test stand) in UN Comtrade data were China ($289M, 19% of world imports), the United States ($208M) and India ($85M). World imports came to about $1.6B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

Is the HS code for Engine test stand the same in all countries?

The base HS code 903120 for Engine test stand is internationally standardized for the first 6 digits across 200+ countries. Individual countries may add additional digits for national tariff lines and specific classifications.

What is the NCM code for engine test stand in Brazil?

Brazil splits HS 903120 into 2 NCM codes, so the right one for engine test stand depends on the product's details: 9031.20.10 (Engine test benches), 9031.20.90 (Other test benches).