U.S. imports of Millstones, Grindstones & Grinding Wheels of Natural Stone (HS 680423) totaled $2.0M in September 2026, imported from 20 countries.
Importers of Millstones, Grindstones & Grinding Wheels of Natural Stone paid $6K in duties in September 2026, an average duty rate of 0.28% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: September 2026 dataCarved or shaped from quarried stone rather than manufactured bonded composites, natural-stone grinding and milling tools occupy a distinct niche in food processing (grain milling), artisan stonework, and traditional craft industries. All US imports under this heading enter under a single 10-digit line, 6804230000, simplifying classification but requiring careful material verification to confirm the article is genuinely natural stone rather than an agglomerated product. Mexico is the leading supplier to the US market, with Japan and China also notable sources. Distinguishing natural-stone articles from synthetic-bonded counterparts is the most common classification challenge at entry.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
275 import shipments a month
A material composition certificate or manufacturer's specification sheet identifying the quarried stone type (e.g., sandstone, granite, novaculite) is the most reliable supporting document. CBP may request laboratory analysis if the composition is ambiguous, since agglomerated products with natural-stone grit can superficially resemble solid natural-stone articles.
Yes. Traditional grain milling for artisan flour production, certain Japanese culinary knife-sharpening applications, and heritage stonecutting trades often specify natural stone for its particular cutting characteristics and surface finish. These niche demand segments sustain import flows even where synthetic abrasives dominate industrial use.
Subheading 5 of 5 in heading 6804
Subheading 680423 · $2.0M of $46.4M
ImportsExports
Imports
$2.0MYoY · free account
Exports
—YoY · free account
12-mo low · imports
Low · free accountOver the twelve months to September 2026, the U.S. imported $20.5M of Millstones, Grindstones & Grinding Wheels of Natural Stone.
Through September 2026 · exports 11 of 12 months reported. Source: U.S. Census Bureau.
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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 |
|---|---|---|---|---|---|
| 6804230000 | Othr Millstnes Grndstns Etc of Natural Stone | $1.8M | 0.78% | 4.55% | $14K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 6804230000 | Othr Millstnes Grndstns Etc of Natural Stone | $716K |
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.
Imports · September 2026
origin
Mexico and Japan together supply 99% of it. China pays 37.5% duty; Mexico 0.0%.
customs district
destination
entry
rate provision · imports
98.9% enters free of duty; duty collected equals 0.28% of imports for consumption.