Bases and frames for the coordinate-measuring machines of subheading 9031.49.40
Measuring or checking instruments, appliances and machines, not specified or included elsewhere in this chapter; profile projectors; parts and accessories thereof: > Parts and accessories: > Of other optical instruments and appliances, other than test benches: > Bases and frames for the coordinate-measuring machines of subheading 9031.49.40
Duty Rate (from China)
Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Products classified under HTS 9031.90.45.00
Granite Base for CMM
Precision-ground granite surface plate used as the stable base for coordinate-measuring machines (CMMs) under 9031.49.40. Its low thermal expansion and high rigidity ensure accurate 3D measurements by minimizing vibration and distortion. Classified under 9031.90.45.00 as a dedicated base component for these optical measuring instruments.
Cast Iron CMM Frame
Heavy-duty cast iron structural frame providing the rigid skeleton for bridge-style CMMs of 9031.49.40. Designed with kinematic mounts for probe alignment and vibration damping. Falls under 9031.90.45.00 as an essential frame for coordinate measuring precision.
Aluminum CMM Portal Frame
Lightweight aluminum gantry frame for high-speed gantry-style CMMs per 9031.49.40. Features precision-machined guideways and thermal compensation slots. Classified in 9031.90.45.00 for its role in supporting optical coordinate measurement.
CMM Granite Table with T-Slots
Granite measuring table with integrated T-slot fixturing system for CMMs of subheading 9031.49.40. Provides reference datum surface and workpiece clamping. 9031.90.45.00 classification due to coordinate-measuring machine specificity.
Precision Steel CMM Base Frame
Epoxy-granite composite steel frame base for horizontal arm CMMs (9031.49.40). Optimized stress-relieved construction prevents measurement drift. Dedicated base component under 9031.90.45.00.
CMM Bridge Structure Frame
Aluminum bridge beam frame for cantilever CMM designs under 9031.49.40. Precision-machined for linear guide integration and minimal deflection. Classifies as frame under 9031.90.45.00 per chapter part rules.
Vibrations-Isolated CMM Base
Granite base with integrated pneumatic vibration isolation mounts for 9031.49.40 CMMs. Provides sub-micron stability for high-precision coordinate measurement. 9031.90.45.00 as coordinate-measuring machine base.
CMM Gantry Crossbeam Frame
Hollow aluminum crossbeam frame for large gantry CMMs (9031.49.40). Internal ribbing for stiffness-to-weight optimization. Specific frame design under 9031.90.45.00.