Other
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: > Gear boxes and other speed changers: > Fixed ratio speed changers, multiple and variable ratio speed changers each ratio of which is selected by manual manipulation: > Other
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)
Subheadings
Products classified under HTS 8483.40.50
Manual Multi-Speed Gearbox
A variable ratio gearbox with multiple manually selectable speeds for machine tools and agricultural equipment. Classified in HTS 8483.40.50 due to hand-lever operation for ratio changes without electronic controls. Provides precise speed control for drilling, milling, and tractor PTO drives.
Agricultural Tractor PTO Speed Changer
Manual multi-speed PTO gearbox for tractors allowing operator selection of 540/1000 RPM ratios. HTS 8483.40.50 covers fixed ratio speed changers with hand lever operation. Essential for matching implement speed requirements.
Benchtop Belt Drive Speed Changer
Tabletop variable speed changer with stepped pulleys and belt tension lever for small workshop tools. Classified HTS 8483.40.50 as manually adjustable ratio device. Used for drill presses, band saws, and grinders.
Wafer Grinder Spindle Speed Changer
Manual multi-speed gearbox for semiconductor wafer grinding equipment spindle drive. Allows precise RPM selection for different grind/lap/polish stages. HTS 8483.40.50 as manually operated speed changer.
Wind Tunnel Drive Gearbox
Variable ratio speed changer with handwheel ratio selector for wind tunnel fan test drives. HTS 8483.40.50 covers manual operation for aerodynamic testing. Provides precise airflow speed control.
Test Stand Engine Dynamometer Gearbox
Fixed ratio speed matching gearbox for engine test stands with manual ratio selection. HTS 8483.40.50 for laboratory engine performance testing applications. Matches engine RPM to dyno absorber speeds.
Laboratory Centrifuge Speed Changer
Manual pulley speed changer for research centrifuges with belt position selector. HTS 8483.40.50 as hand-operated variable ratio device for lab use. Provides precise rotor speed control.
Observatory Telescope Drive Gearbox
Precision manual speed changer for observatory telescope tracking with handwheel ratio selection. Extremely low backlash for sidereal tracking accuracy. HTS 8483.40.50 classification for astronomical applications.
Industrial Worm Gear Reducer
A fixed-ratio speed changer using a worm gear mechanism to reduce motor speed and increase torque for industrial machinery. It falls under HTS 8483.40.50 as a multiple ratio speed changer with ratios selected manually via handwheel or lever. Commonly used in conveyors, mixers, and elevators.
Hand-Operated Variable Speed Reducer
Compact speed changer with cone pulley system and hand belt shifter for multiple ratios in laboratory equipment and small machinery. HTS 8483.40.50 classification applies to manual belt position selection mechanism. Used in ventilators, centrifuges, and bench grinders.
Precision Gear Head for CNC Machines
Multi-stage fixed ratio gear head with manual quill engagement for CNC mills and lathes. Falls under HTS 8483.40.50 as manually selectable ratio speed changer for metalworking. Provides high torque at low speeds for heavy cuts.
Crystal Puller Speed Reducer
Precision manual speed changer for Czochralski crystal growth furnaces used in semiconductor boule pulling. HTS 8483.40.50 applies to manually controlled rotation speed selection. Critical for maintaining uniform crystal diameter growth.
Elevator Machine Room Gearbox
Manual backup speed changer for elevator traction machines with hand-crank emergency operation. HTS 8483.40.50 classification for manually selectable ratios. Provides descent control during power failure.
Manual Stage Gearbox for Theater
Multi-speed manual gearbox for theater fly systems and stage wagons. Allows scene changes at different speeds via hand crank. Classified HTS 8483.40.50 as manually selectable ratio changer.
Hand-Cranked Winch Gear Reducer
Multiple ratio gear reducer with hand crank selector for marine and industrial winches. Provides mechanical advantage through manual ratio changes. HTS 8483.40.50 classification for manually operated speed changer.