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U.S. imports of grinding wheels & similar articles of agglomerated diamond (HS 680421) totaled $20.5M in July 2026, traded with 43 countries.
Importers of Grinding Wheels & Similar Articles of Agglomerated Diamond paid $2.4M in duties in July 2026 — an effective duty rate of 12% on $19.3M in dutiable value, based on actual customs collections rather than the published tariff schedule. Grinding Wheels & Similar Articles of Agglomerated Diamond imports of $20.5M in July 2026 ran 11% above the year-to-date monthly average of $18.4M.
Last updated: July 2026 dataAgglomerated diamond grinding wheels and related abrasive tools — including circular saw blade segments — are subject to Section 301 tariffs when sourced from China, making South Korea and Italy, the two leading US suppliers, strategically important alternatives for precision tooling buyers. The US schedule distinguishes circular saw blade segments with diamond agglomerated with metal (6804210010), articles with continuous rim segments on a circular plate (6804210020), multi-segment diamond articles on a circular plate set not for cutting (6804210030), and all other agglomerated diamond abrasives (6804210090). These products are critical inputs for stone fabrication, semiconductor wafer slicing, and construction cutting operations, where diamond bond type and segment geometry directly affect performance specifications.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
1.6K shipments/mo
Segments — the individual diamond-impregnated tips or blocks designed to be brazed or laser-welded onto a steel core — classify under 6804210010 when imported separately. A complete assembled diamond circular saw blade, with segments already attached to the steel core, classifies under heading 8202 as a saw blade rather than under 6804. The import condition (segment alone versus assembled blade) controls the classification.
The 6804.21 subheadings specifically cover diamond agglomerated with metal bonds; resin-bonded, vitrified-bonded, or electroplated diamond tools are not agglomerated in the same sense and may classify under 6804.22 (other agglomerated abrasives) or elsewhere depending on construction. Importers should confirm the bond matrix — metal, resin, or vitrified — before selecting the applicable 10-digit line.
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Subheading 2 of 5 in heading 6804
Subheading 680421 · $20.5M of $47.2M
ImportsExports
Imports
$20.5MYoY · Pro
Exports
$6.8MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 6804210090 | Mllstns Etc of Agglm Synthtc or Nat Diamond,NESOI | $14.3M | 11.91% | 96.58% | $1.7M |
| 6804210030 | Artcls Mult Segs Diam Agglm Mtl Crc Plte St N Cut | $2.8M | 10.89% | 100.03% | $310K |
| 6804210010 | Cir Sawbld Segmt,Diamnd W Metl, Agglm Syn or Natrl | $2.4M | 10.62% | 101.73% | $256K |
| 6804210020 | Artcls W Cont Rim Seg Diam Agglm W Metal Crc Plate | $1.6M | 10.11% | 99.55% | $158K |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 6804210000 | Oth Mllstns Etc of Agglm Synthtc or Nat Diamond | $7.4M |
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 · July 2026
origin
Korea, South and Italy together supply 40% of it.
customs district
destination
entry
rate provision · imports
5.9% enters free of duty; the effective duty rate is 11.65%.