ECCN reference · Category 2: Materials processing
ECCN 2B991
Numerical control units for machine tools and "numerically controlled" machine tools, n.e.s.
Test, inspection and production equipment. Reasons for control: AT (Anti-terrorism).
Does 2B991 need a license to your country?
Enter the full classification (for example 2B991.a.1) and a destination. The check reads the Country Chart, the end-use and embargo rules, and shows the rule and source behind the answer.
License requirements
Each control below comes from the entry’s License Requirements table. Where it names a Country Chart column, the countries with an X in that column need a license for the items the control covers, unless a License Exception applies.
- AT (Anti-terrorism): AT applies to entire entry. No Country Chart country has an X in column AT1; the destinations this control targets are under “Not decided by the Country Chart” below.
Not decided by the Country Chart: Covered Donetsk region of Ukraine (DNR), Covered Luhansk region of Ukraine (LNR), Crimea region of Ukraine, Cuba, Iran, Korea, North, Syria. These destinations are under embargoes or other special controls in 15 CFR Part 746, which require a license for most items whatever the chart shows. Russia and Belarus also have broad Part 746 controls in addition to the chart.
A blank on the Country Chart is not permission to ship. End-use and end-user rules (15 CFR Part 744), embargoes and sanctions (Part 746), and the parties to the transaction still apply. Use the check above for your item and country.
List-based License Exceptions
As the entry lists them. Each exception has its own conditions in 15 CFR Part 740, and § 740.2 bars or limits most of them for Russia, Belarus, Country Group D:5 and embargoed destinations, so an entry’s “Yes” does not mean it is available everywhere.
- LVS: N/A
- GBS: N/A
Items in 2B991
The controls often apply to some paragraphs only, so check the full paragraph, for example 2B991.a.
Show all 23 paragraphs
- 2B991.a "Numerical control" units for machine tools:
- 2B991.a.1 Having four interpolating axes that can be coordinated simultaneously for "contouring control;" or
- 2B991.a.2 Having two or more axes that can be coordinated simultaneously for "contouring control" and a minimum programmable increment better (less) than 0.001 mm;
- 2B991.a.3 "Numerical control" units for machine tools having two, three or four interpolating axes that can be coordinated simultaneously for "contouring control," and capable of receiving directly (on-line) and processing computer-aided-design (CAD) data for internal preparation of machine instructions; or
- 2B991.b "Motion control boards" "specially designed" for machine tools and having any of the following characteristics:
- 2B991.b.1 Interpolation in more than four axes;
- 2B991.b.2 Capable of "real-time processing" of data to modify tool path, feed rate and spindle data, during the machining operation, by any of the following:
- 2B991.b.2.a Automatic calculation and modification of part program data for machining in two or more axes by means of measuring cycles and access to source data; or
- 2B991.b.2.b "Adaptive control" with more than one physical variable measured and processed by means of a computing model (strategy) to change one or more machining instructions to optimize the process.
- 2B991.b.3 Capable of receiving and processing CAD data for internal preparation of machine instructions; or
- 2B991.c "Numerically controlled" machine tools that, according to the manufacturer's technical specifications, can be equipped with electronic devices for simultaneous "contouring control" in two or more axes and that have both of the following characteristics:
- 2B991.c.1 Two or more axes that can be coordinated simultaneously for contouring control; and
- 2B991.c.2 Positioning accuracies according to ISO 230/2 (2006), with all compensations available:
- 2B991.c.2.a Better than 15 µm along any linear axis (overall positioning) for grinding machines;
- 2B991.c.2.b Better than 15 µm along any linear axis (overall positioning) for milling machines; or
- 2B991.c.2.c Better than 15 µm along any linear axis (overall positioning) for turning machines; or
- 2B991.d Machine tools, as follows, for removing or cutting metals, ceramics or composites, that, according to the manufacturer's technical specifications, can be equipped with electronic devices for simultaneous "contouring control" in two or more axes:
- 2B991.d.1 Machine tools for turning, grinding, milling or any combination thereof, having two or more axes that can be coordinated simultaneously for "contouring control" and having any of the following characteristics:
- 2B991.d.1.a One or more contouring "tilting spindles;"
- 2B991.d.1.b "Camming" (axial displacement) in one revolution of the spindle less (better) than 0.0006 mm total indicator reading (TIR);
- 2B991.d.1.c "Run out" (out-of-true running) in one revolution of the spindle less (better) than 0.0006 mm total indicator reading (TIR);
- 2B991.d.1.d The "positioning accuracies", with all compensations available, are less (better) than: 0.001° on any rotary axis;
- 2B991.d.2 Electrical discharge machines (EDM) of the wire feed type that have five or more axes that can be coordinated simultaneously for "contouring control."
Source
Commerce Control List, 15 CFR Part 774, Supplement No. 1 (official text on eCFR), as of August 21, 2026, 1:45AM EDT. Commerce Country Chart, Supplement No. 1 to Part 738, as of August 21, 2026, 1:45AM EDT.
This page is a preliminary reference, not legal advice, a classification ruling or permission to ship. Confirm the classification against the full official text.