8431.43

Analysis

Subheading 8431.43 covers parts for boring or sinking machinery of subheading 8430.41 or 8430.49, within heading 8431. The first six digits are shared by every country that uses the Harmonized System, so this part of the code is the same in the US, UK and EU schedules; the 2 US tariff lines below it are national.

Every one of its 2 tariff lines is duty-free at the general rate, so classification within the subheading affects statistics and Chapter 99 measures rather than the base duty.

The US splits it as follows: 8431.43.40 for of offshore oil and natural gas drilling and production platforms (duty-free) and 8431.43.80 for parts for boring or sinking machinery of subheading 8430.41 or… (duty-free).

By Census's concordance, most of its statistical lines are made by Oil and Gas Field Machinery and Equipment Manufacturing (333132) and Construction Machinery Manufacturing (333120). Those are the NAICS industries a US producer of these goods would report under.