Other speed changers
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: > Other speed changers
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 8483.40.70.00
Multi-Step Pulley Speed Reducer
Speed changer with multiple fixed-diameter pulleys on stepped cones for discrete speed settings via belt repositioning. HTS 8486.40.70.00 covers this as mechanical speed changer alternative to gear systems. Used in lathes, drill presses, and agricultural equipment.
Crystal Puller Drive Speed Changer
Variable speed mechanical transmission for Czochralski crystal pullers producing monocrystalline silicon boules. HTS 8486.40.70.00 applies to semiconductor manufacturing equipment per statistical notes. Controls precise pull rates for defect-free crystals.
Belt-Type Continuously Variable Transmission
CVT using metal push-belt and variable pulleys for automotive and industrial applications. Mechanical speed changer under HTS 8486.40.70.00 excluding torque converters. Provides infinite speed ratios within operating range.
Float Zone Crystal Growth Speed Changer
Precision speed changer for float zone method crystal growers producing semiconductor material boules. Covered by HTS 8486.40.70.00 statistical provisions for wafer manufacturing equipment. Controls zone travel speed for purity control.
Wafer Slicing Saw Speed Controller
Mechanical speed changer regulating diamond saw blade RPM for slicing semiconductor wafers from boules. HTS 8486.40.70.00 per statistical note (a)(ii)(B) wafer slicing equipment. Ensures precise kerf width and surface quality.
Machine Tool Variable Speed Head
Spindle speed changer for CNC mills and lathes using mechanical gearing or belts. HTS 8486.40.70.00 as other speed changer for metalworking machinery. Provides wide speed range for different materials and tools.
Textile Machinery Draft Change Gearbox
Speed changer adjusting draft ratios in spinning and drawing frames for yarn production. Mechanical system under HTS 8486.40.70.00 providing multiple fiber drafting speeds. Essential for different fiber types and counts.
Agricultural Tractor PTO Speed Multiplier
Mechanical speed increaser converting standard 540 RPM PTO to higher speeds for implements. HTS 8486.40.70.00 as other speed changer for farm equipment. Common for hay conditioners and post hole diggers.
Crystal Grinder Diameter Control Drive
Precision speed changer for grinding semiconductor crystal boules to exact wafer diameters. Statistical note (a)(ii)(A) coverage under HTS 8486.40.70.00. Controls grind rate for conductivity flat indication.
Elevator Traction Sheave Speed Changer
Variable speed mechanical drive for elevator traction sheaves using multi-groove pulleys. HTS 8486.40.70.00 as other speed changer for vertical transport. Provides smooth acceleration/deceleration profiles.
Wind Tunnel Drive Variable Speed Unit
High-power mechanical speed changer for wind tunnel fan drives providing precise airflow simulation. HTS 8486.40.70.00 for aerodynamic testing equipment. Covers subsonic to supersonic test requirements.
Wafer Lapping/Polishing Speed Controller
Mechanical speed changer maintaining constant surface speed during semiconductor wafer lapping/polishing. Statistical note (a)(ii)(C) coverage under HTS 8486.40.70.00. Critical for wafer flatness within nanometer tolerances.
Industrial Variable Speed Drive
A mechanical device using belts, pulleys, and cones to provide stepless speed variation in industrial machinery. Classified under HTS 8486.40.70.00 as an other speed changer due to its function in altering rotational speed without discrete gears. Used in conveyors, fans, and pumps for precise control.
Cone Pulley Speed Changer
Mechanical speed changer using tapered cone pulleys with sliding belts to achieve variable speed ratios. Falls under HTS 8486.40.70.00 as other speed changer distinct from fixed-ratio gearboxes. Common in machine tools and textile machinery.
Wafer Grinder Speed Controller
Precision mechanical speed changer for controlling rotational speed of wafer grinding/lapping equipment in semiconductor fabrication. Statistical note coverage under HTS 8486.40.70.00 for semiconductor processing machines. Maintains exact RPM for flatness tolerances.