U.S. imports of Parts for Metal Rolling Mills (Except Rolls) (HS 845590) totaled $29.0M in August 2026, imported from 38 countries.
Importers of Parts for Metal Rolling Mills (Except Rolls) paid $4.6M in duties in August 2026, an average duty rate of 15.92% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Parts for Metal Rolling Mills (Except Rolls) imports of $29.0M in August 2026 ran 51% above the year-to-date monthly average of $19.2M.
Last updated: August 2026 dataSpare and replacement parts for metal rolling mills — excluding the rolls themselves — cover a broad range of structural and mechanical components, from housings and chocks to drive shafts and hydraulic assemblies. The US schedule distinguishes oversized castings or weldments with individual weight exceeding 90 metric tons (8455904000) from general mill parts (8455908000), with a legacy catch-all at 8455900000. Italy and Germany are the top US suppliers, followed by China and India. Chinese-origin parts may carry Section 301 exposure, and the 90-metric-ton casting provision is a classification edge case that frequently requires binding ruling requests given the rarity and high value of such components.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
513 import shipments a month
This line targets extremely large structural components — such as mill housings or backup roll chocks — that are cast or welded as single units weighing more than 90 metric tons. The distinction matters because these items may carry a different duty rate than general mill parts under 8455908000. Importers should obtain the manufacturer's certified weight documentation and confirm the component is a casting or weldment (not a machined or fabricated assembly) before applying this line.
CBP applies the 'principal use' and 'dedicated use' tests: a part classifiable as a rolling mill part must be identifiable by its design as suitable for use solely or principally with rolling mills of heading 8455. Generic bearings, seals, or fasteners that are interchangeable across many machine types generally classify in their own headings rather than as mill parts. Technical drawings and the OEM's parts catalog are the primary supporting documents.
Subheading 1 of 5 in heading 8455
Subheading 845590 · $29.0M of $61.3M
Trade Directory
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HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 8455908000 | Parts for Metal Rolling Mills & Rolls Therfr, NESOI | $24.7M | 15.29% | 98.64% | $3.8M |
| 8455904000 | Castings or Weldments, Indi Wgt Gt 90 T Fr Hd 8455 | $4.3M | 19.50% | 100.00% | $841K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 8455900000 | Parts for Metal Rolling Mills Exc Rolls for Rol Mi | $4.7M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
ImportsExports
Imports
$29.0MYoY · free account
Exports
$4.7MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $210.9M of Parts for Metal Rolling Mills (Except Rolls) and exported $89.9M.
Through August 2026. Source: U.S. Census Bureau.
Imports · August 2026
origin
Germany and Italy together supply 77% of it. China pays 39.9% duty; Canada 13.6%.
customs district
entry
rate provision · imports
1.2% enters free of duty; duty collected equals 15.92% of imports for consumption.