Importers of HS 7318.15 (having shanks or threads with a diameter of less than 6 mm) from United Kingdom actually paid 41.88% on the taxed portion of the value in 2026-06 — 39.38% across everything shipped, taxed or not. Measured from official duty receipts, not the rulebook: the statutory MFN base rate on this code is 6.2%. Over the window the rate on the taxed portion moved 7.9% → 41.88%, with the largest single step +12.9pp in 2026-04. Measured from official US duty receipts · as-of 2026-06 · confidence: measured, not modelled. The HTS base rate is 6.2% — importers actually paid 41.88%, so the trade-war overlay added 35.7 pts, measured at the border (not a summed rulebook estimate). Reproduce exactly: tariff_story(hs: "7318.15", origin: "United Kingdom") · see it at trimtabist.com/tariffs
HS 7318.15. The schedule base rate is 6.2%; importers from United Kingdom actually paid 41.88% on the dutiable value in 2026-06 — the trade-war overlay added 35.7 points, measured at the border. Measured, not modelled.
Over the window the collected rate moved 7.9% (2023-07) → 41.88% (2026-06), largest single step +12.9pp in 2026-04.
United Kingdom's lower duty (39.38% vs 77.06%) lets it price up to 27% above China at the factory and still match on duty-inclusive customs cost. But on the LATEST measured prices, China actually lands cheaper — $2.66/kg vs $6.62/kg (duty in, freight out).
15 Chapter-99 measures name United Kingdom; scope mapping is partial (several annexes are PDFs) — absence never means exemption. They do not sum, and some are product-specific — the collected rate above is the composed truth.
All goods from United Kingdom · the whole tariff ledger · 13 CBP rulings cite this code · reproduce: tariff_story(hs: "7318.15", origin: "United Kingdom") via /connect. Not customs or legal advice.