Importers of HS 8483.90 (chain sprockets and parts thereof) from Korea, South actually paid 20.37% on the taxed portion of the value in 2026-06 — 14.74% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 2.8%. Over the window the rate on the taxed portion moved 2.61% → 20.37%, with the largest single step -15.1pp in 2026-05. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 2.8% — importers actually paid 20.37%, so the trade-war overlay added 17.6 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "8483.90", origin: "Korea, South") · see it at trimtabist.com/tariffs
HS 8483.90. The schedule base rate is 2.8%; importers from South Korea actually paid 20.37% on the dutiable value in 2026-06 — the trade-war overlay added 17.6 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 2.61% (2023-07) → 20.37% (2026-06), largest single step -15.1pp in 2026-05.
Korea, South's lower duty (14.74% vs 42.4%) lets it price up to 24.1% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, Korea, South actually lands cheaper — $6.67/kg vs $7.78/kg (duty in, freight out).
All goods from South Korea · the whole tariff ledger · 8 CBP rulings cite this code · reproduce: tariff_story(hs: "8483.90", origin: "South Korea") via /connect. Not customs or legal advice.