Analysis
HTS 4406.11.00 covers not impregnated: coniferous under heading 4406 (railway or tramway sleepers (cross-ties) of wood).
The normal trade relations rate here is zero, shared by about 61% of the 257 tariff lines in chapter 44, a useful check when a neighbouring dutiable line is a candidate. Free here means free of the base duty only: origin-specific Chapter 99 duties such as Section 301 can still be owed.
The other lines in the same group are 4406.12.00 (not impregnated: nonconiferous, duty-free), 4406.91.00 (other: coniferous, duty-free) and 4406.92.00 (other: nonconiferous, duty-free).
Census statistics map these goods to NAICS 321113 (Sawmills), an industry of 2,691 US establishments employing 79,871 people. That concordance is how imports of this line are compared with US output.
All 3 neighbouring lines carry the same duty-free rate, so a borderline choice between them changes the statistics reported, not the duty paid.
Every edition we compared, from Jan 2023 to Oct 2026 (Rev. 22), shows the same general rate of Free.
Neighbouring lines
| Line | Description | General rate |
|---|---|---|
| 4406.12.00 | Not impregnated: nonconiferous | Free |
| 4406.91.00 | Other: coniferous | Free |
| 4406.92.00 | Other: nonconiferous | Free |