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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If suitable for multiple measuring instruments beyond CMMs
Parts not dedicated solely to 9031.49.40 CMMs fall into general parts/accessories for measuring instruments.
If incorporates air-bearing mounting holes
Air-bearing components may shift to machinery parts under heating/cooling equipment if multifunctional.
If imported without CMM-specific machining
Unworked granite articles classify by material, not end-use specificity.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Verify granite density and flatness certification meets CMM tolerances (typically <5μm/300mm) for customs valuation
• Include CMM model compatibility docs to avoid reclassification as general granite under 6802
• Check for anti-dumping duties on granite from specific countries like India or China
Related Products under HTS 9031.90.45.00
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.