U.S. imports of Numerically Controlled Knee-Type Milling Machines for Metal (SITC 73151) totaled $154K in August 2026, imported from 7 countries.
Importers of Numerically Controlled Knee-Type Milling Machines for Metal paid $38K in duties in August 2026, an average duty rate of 24.82% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Numerically Controlled Knee-Type Milling Machines for Metal imports of $154K in August 2026 ran 39% below the year-to-date monthly average of $254K.
Last updated: August 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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5 import shipments a month
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.
Basic heading 73151 · $154K of $172.0B
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ImportsExports
Imports
$154KYoY · free account
Exports
—YoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $2.6M of Numerically Controlled Knee-Type Milling Machines for Metal.
Fewer than 6 of the last 12 months reported trade, or the latest month was under $500K; the trend chart is not shown for thin series.
Through August 2026 · exports 9 of 12 months reported. Source: U.S. Census Bureau.
Imports · August 2026
origin
Italy and China together supply 100% of it. China pays 41.7% duty; Italy 10.0%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.