Four kinds of hierarchal commodity codes are introduced here. SITC and HS are two commonly-used commodity codes tracking world exports and imports, while SIC and NAICS codes are mainly used for industrial or business activities although also used for trade data. You can reach these code systems quickly through the U.S. Census Bureau webpage.
All of the imports and export codes used by the United States are based on the Harmonized Tariff System (HTS), which is also called Harmonized Tariff Code (HTC). The HTS assigns 6-digit codes for general categories. Countries which use the HTS are allowed to define commodities at a more detailed level than 6-digits, but all definitions must be within that 6-digit framework. The U.S. defines products using 10-digit HTS codes. Exports codes (which the U.S. calls Schedule B) are administered by the U.S. Census Bureau. Import codes are administered by the U.S. International Trade Commission (USITC).Web sites for U.S. import and export HTS codes:
Here is an example of a hierarchy from HS:
61 Articles of apparel and clothing accessories, knitted or crocheted
6103 Men's or boys' suits, ensembles, suit-type jackets....knitted or crocheted
6103.19 Of other textile materials
6103.19.20 Of cotton
618.104.22.168 Jackets imported as parts of suits