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SITCSection 7
U.S. imports of dividing heads and special attachments for machine tools (SITC 73515) totaled $9.4M in April 2026, traded with 35 countries.
Importers of Dividing Heads and Special Attachments for Machine Tools paid $1.2M in duties in April 2026 — an effective duty rate of 15% on $7.6M in dutiable value, based on actual customs collections rather than the published tariff schedule. Dividing Heads and Special Attachments for Machine Tools imports of $9.4M in April 2026 ran 15% above the year-to-date monthly average of $8.2M.
Last updated: April 2026 dataDividing heads — also called indexing heads — enable precise angular positioning of a workpiece on a milling machine, making them indispensable for cutting gears, splines, and evenly spaced features. This heading also captures other specialized machine-tool attachments such as rotary tables, angle plates, and milling attachments that extend a machine's capability beyond its standard configuration. The precision and repeatability specifications of these attachments are closely tied to the accuracy grade of the host machine, making specification matching a key procurement consideration.
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A dividing head is designed primarily for indexing a workpiece to precise angular positions for gear-cutting and similar operations, typically mounted between centers. A rotary table provides continuous or indexed rotation, often used for circular milling and drilling. Both fall under SITC 73515 as special attachments for machine tools, though at the HTS 10-digit level they may be distinguished by type.
CBP looks to the attachment's design, marketing materials, and technical specifications to determine principal use. Manufacturer catalogs, technical drawings showing the machine-tool interface, and commercial invoices describing the attachment's function are the standard supporting documents. If the attachment has plausible non-machine-tool uses, a binding ruling from CBP before importation provides the most reliable classification certainty.
Monthly import values over time
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