HS code · 6-digit subheading
HS Code 6804.21 – Millstones, grindstones, grinding wheels and the like; of agglomerated synthetic or natural diamond
HS code 6804.21 is the 6-digit subheading for millstones, grindstones, grinding wheels and the like, of agglomerated synthetic or natural diamond. It is used for diamond grinding wheels, diamond cutting discs, diamond polishing pads, diamond honing stones and diamond saw blades.
What HS 6804.21 covers
This HS code covers high-performance millstones, grindstones, grinding wheels, and similar abrasive tools made from agglomerated synthetic or natural diamond. These tools are at the forefront of precision grinding and cutting technology, essential for working with extremely hard materials such as ceramics, carbides, glass, stone, and advanced alloys. The diamond abrasive provides unparalleled hardness and cutting efficiency, making these tools indispensable in industries requiring high precision and material removal rates. Major importers are typically countries with advanced manufacturing sectors, including automotive, aerospace, electronics, and construction. Exporters are often nations with strong R&D capabilities in materials science and advanced manufacturing. Key considerations in trade include diamond concentration, bond type, and tool geometry, which dictate performance and application.
- Covers
- Diamond grinding wheels
- Diamond cutting discs
- Diamond polishing pads
- Diamond honing stones
- Diamond saw blades
- Diamond core bits
- Diamond files
- Examples
- Norton Abrasives diamond wheels
- Tyrolit diamond cutting discs
- 3M Cubitron diamond abrasives
- Bosch diamond saw blades
Codes often confused with 6804.21
Common mistake. Easily confused with 680422 (other agglomerated abrasives) or 680423 (natural stone abrasives) if the diamond component is overlooked. The 'agglomerated synthetic or natural diamond' is the defining characteristic.
Top exporters and importers of HS code 680421, 2025
In 2025, the largest exporter of HS code 680421 in UN Comtrade data was China, with 14% of world exports; the largest importer in UN Comtrade data was China, with 16% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.
Top exporters 2025 · share of world exports
- 1 China $253M 14% of world exports
- 2 South Korea $236M 13% of world exports
- 3 Italy $227M 12% of world exports
World total: $1.8B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 China $353M 16% of world imports
- 2 United States $230M 11% of world imports
- 3 Germany $191M 8.7% of world imports
World total: $2.2B Reported figures on UN Comtrade ↗
How these figures are built
109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).
Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.
Brazil NCM codes for 6804.21 3
Brazil splits HS 6804.21 into 3 NCM codes, Mercosur's 8-digit tariff lines.
- 6804.21.1 Of a diameter less than 53.34 cmDe diâmetro inferior a 53,34 cm Group
- 6804.21.11 Resin-bonded diamond wheels, under 53.34 cmAglomerados com resina
- 6804.21.19 Other diamond wheels under 53.34 cm diameterOutros
- 6804.21.90 Diamond grinding wheels, 53.34 cm or moreOutros
All Brazil NCM codes in heading 68.04 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 6804.21
What is HS code 680421?
HS code 680421 is a 6-digit subheading in the Harmonized System that covers: Millstones, grindstones, grinding wheels and the like; of agglomerated synthetic or natural diamond. This HS code covers high-performance millstones, grindstones, grinding wheels, and similar abrasive tools made from agglomerated synthetic or natural diamond. These tools are at the forefront of precision grinding and cutting technology, essential for working with extremely hard materials such as ceramics, carbides, glass, stone, and advanced alloys. The diamond abrasive provides unparalleled hardness and cutting efficiency, making these tools indispensable in industries requiring high precision and material removal rates. Major importers are typically countries with advanced manufacturing sectors, including automotive, aerospace, electronics, and construction. Exporters are often nations with strong R&D capabilities in materials science and advanced manufacturing. Key considerations in trade include diamond concentration, bond type, and tool geometry, which dictate performance and application.
What products fall under HS code 680421?
Diamond grinding wheels, diamond cutting discs, diamond polishing pads, diamond honing stones, diamond saw blades, diamond core bits, diamond files
What are common misclassifications for HS code 680421?
Easily confused with 680422 (other agglomerated abrasives) or 680423 (natural stone abrasives) if the diamond component is overlooked. The 'agglomerated synthetic or natural diamond' is the defining characteristic.
Which countries are the top exporters of goods under HS code 680421?
In 2025, the top exporters of HS code 680421 in UN Comtrade data were China ($253M, 14% of world exports), South Korea ($236M) and Italy ($227M). World exports came to about $1.8B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
Which countries are the top importers of goods under HS code 680421?
In 2025, the top importers of HS code 680421 in UN Comtrade data were China ($353M, 16% of world imports), the United States ($230M) and Germany ($191M). World imports came to about $2.2B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.
How is HS code 680421 structured?
HS code 680421 is a 6-digit subheading under the Harmonized System. The first 2 digits (68) identify the chapter, digits 3-4 (04) identify the heading, and digits 5-6 (21) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 680421?
Brazil splits HS code 680421 into 3 NCM codes: 6804.21.11 (Resin-bonded diamond wheels, under 53.34 cm), 6804.21.19 (Other diamond wheels under 53.34 cm diameter), 6804.21.90 (Diamond grinding wheels, 53.34 cm or more). The first 6 digits of each match the HS code.