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HSChapter 73
U.S. imports of forged or stamped grinding balls and similar mill articles of iron or steel (HS 732611) totaled $435K in April 2026, traded with 11 countries.
Importers of Forged or Stamped Grinding Balls and Similar Mill Articles of Iron or Steel paid $258K in duties in April 2026 — an effective duty rate of 59% on $435K in dutiable value, based on actual customs collections rather than the published tariff schedule. Forged or Stamped Grinding Balls and Similar Mill Articles of Iron or Steel imports of $435K in April 2026 ran 34% below the year-to-date monthly average of $663K.
Last updated: April 2026 dataForged and stamped grinding balls for ball mills and similar comminution equipment are distinguished from their cast counterparts by a manufacturing process that produces a denser, more uniform microstructure — a performance advantage in high-impact milling applications such as hard-rock mining. All such articles enter under a single 10-digit line (7326110000). Canada leads US imports of this heading, followed by China and Indonesia, with India and Taiwan also supplying the market.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
A manufacturer's process declaration or mill certificate confirming that the balls were produced by forging or stamping — rather than casting — is the primary supporting document. Metallurgical test reports showing grain structure consistent with forging can provide additional support. This documentation is important because the forged (7326.11) and cast (7325.91) provisions carry different tariff treatment, and CBP may request evidence of the manufacturing method during a CF-28 or CF-29 inquiry.
Canadian-origin forged grinding balls may qualify for USMCA preferential duty treatment if they satisfy the applicable Chapter 73 rules of origin, typically requiring a tariff classification change from the steel input or meeting a regional value content threshold. Importers should obtain a USMCA certification of origin from their Canadian supplier and confirm that the forging operation in Canada constitutes sufficient transformation under the agreement's rules.
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 7326110000 | GRNDNG BLS A SIM ARTIC FR MILLS FRGD/STMPD OF IOS | $435K | 59.29% | $258K |
GRNDNG BLS A SIM ARTIC FR MILLS FRGD/STMPD OF IOS
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7326110000 | GRNDNG BLS A SIM ARTIC FR MILLS FRGD/STMPD OF IOS | $2.2M |
GRNDNG BLS A SIM ARTIC FR MILLS FRGD/STMPD OF IOS
846.3K kg
ARTICLES OF IRON OR STEEL NESOI
HS 732690
STRUCTURES AND PARTS NESOI OF IRON OR STEEL
HS 730890
THREADED SCREWS AND BOLTS NESOI OF IRON OR STEEL
HS 731815
COOKING APPLIANCES ETC FOR GAS FUEL, IRON OR STEEL
HS 732111
NUTS OF IRON OR STEEL
HS 731816
TABLE, KITCHEN ETC ARTICLES & PTS, STAINLESS STEEL
HS 732393
| Port | Imports | Exports | Balance |
|---|---|---|---|
| LAREDO, TX | -- | $1.6M | +$1.6M |
| BLAINE, WA | $250K | -- | -$250K |
| DETROIT, MI | -- | $170K | +$170K |