Gears and gearing, other than toothed wheels, chain sprockets and other transmission elements entered separately
Transmission shafts (including camshafts and crankshafts) and cranks; bearing housings, housed bearings and plain shaft bearings; gears and gearing; ball or roller screws; gear boxes and other speed changers, including torque converters; flywheels and pulleys, including pulley blocks; clutches and shaft couplings (including universal joints); parts thereof: > Gears and gearing, other than toothed wheels, chain sprockets and other transmission elements entered separately; ball or roller screws; gear boxes and other speed changers, including torque converters: > Gears and gearing, other than toothed wheels, chain sprockets and other transmission elements entered separately
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 9903.88.05, 9903.88.06, 9903.88.07, 9903.88.08, 9903.88.10, 9903.88.11, 9903.88.14, 9903.88.19, 9903.88.50, 9903.88.52, 9903.88.58, 9903.88.60, 9903.88.62, 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(a) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(b) [to this subchapter]
Products classified under HTS 8483.40.90.00
Helical Gear Set for Industrial Machinery
A precision-engineered set of helical gears designed for transmitting motion and torque in heavy industrial machinery such as conveyors and mixers. Classified under HTS 8483.40.90.00 as gearing other than toothed wheels or sprockets, due to its helical tooth configuration for smooth power transmission. Excludes simple toothed wheels entered separately.
Planetary Gearbox Assembly
Compact planetary gear system consisting of sun gear, planet gears, and ring gear for high-torque, low-speed applications in robotics and automation. Falls under HTS 8483.40.90.00 as complex gearing beyond simple toothed wheels or sprockets. Provides gear reduction ratios up to 100:1 in integrated housing.
Worm Gear Reducer
Worm wheel and screw gear combination providing high reduction ratios and self-locking capability for conveyor drives and winches. HTS 8483.40.90.00 covers this orthogonal gearing system excluded from toothed wheel or sprocket categories. Typically bronze worm wheel mated with hardened steel worm.
Bevel Gear Pair for Right-Angle Drive
Miter or spiral bevel gears transmitting power at 90-degree angles in differential assemblies and machine tools. Classified HTS 8483.40.90.00 as specialized gearing distinct from straight toothed wheels. Provides smooth torque transfer with minimal backlash.
Rack and Pinion Gear Set
Linear motion conversion system with circular pinion gear engaging straight rack for CNC machines and steering systems. HTS 8483.40.90.00 captures this linear gearing excluded from toothed wheel specifics. Precision ground for minimal backlash in automation.
Spur Gear Cluster for Multi-Stage Reduction
Multiple integral spur gears of varying diameters on single shaft for sequential speed reduction in pumps and compressors. Falls under HTS 8483.40.90.00 as compound gearing beyond single toothed wheels. Provides stepped ratios in compact form factor.
Hypoid Gear Set for Heavy Duty Applications
Offset axis hypoid gears providing superior strength for axle drives and heavy machinery differentials. HTS 8483.40.90.00 includes this advanced gearing type excluded from basic toothed wheel definitions. Features curved teeth for quiet operation and high loads.
Precision Timing Gear Set
Matched helical or spur gears with exact tooth timing for camshaft drives and indexing tables. Classified HTS 8483.40.90.00 as specialized transmission gearing. Laser-marked timing indicators ensure phase accuracy within 1 arcminute.