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SITCSection 7
U.S. imports of numerically controlled knee-type milling machines for metal (SITC 73151) totaled $241K in April 2026, traded with 4 countries.
Importers of Numerically Controlled Knee-Type Milling Machines for Metal paid $31K in duties in April 2026 — an effective duty rate of 22% on $139K in dutiable value, based on actual customs collections rather than the published tariff schedule. Numerically Controlled Knee-Type Milling Machines for Metal imports of $241K in April 2026 ran 38% below the year-to-date monthly average of $388K.
Last updated: April 2026 dataKnee-type milling machines with CNC control combine the adjustable-knee vertical travel of a traditional Bridgeport-style mill with programmable axis motion, making them a transitional technology between manual toolroom equipment and full machining centers. SITC 73151 captures this specific configuration — knee-type architecture plus numerical control — which is distinct from both non-CNC knee mills (73152) and CNC milling machines of other configurations (73153). These machines are widely used in small-batch production, toolmaking, and educational machining programs where the knee's manual Z-axis adjustment supplements CNC X-Y control.
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A knee-type milling machine has a vertically adjustable knee that supports the saddle and table, allowing the operator to set the working height independently of the spindle. This distinguishes it from bed-type or planer-type mills where the table moves only horizontally. The knee must be present and functional for the machine to qualify under the knee-type headings (73151 for CNC, 73152 for non-CNC).
Possibly. An automatic tool changer is a defining feature of machining centers under the HTS and SITC schedules. If the machine's primary design and marketing position it as a machining center with a knee-type table, it may belong in the machining center heading rather than 73151. Importers should obtain a binding ruling or consult a licensed customs broker when the machine has both a knee and an ATC, as this is a recognized classification gray area.
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Monthly import values over time