Chapter 8431 — Customs Tariff Headings

8431.20.00Of machinery of heading 84.27

8431.3Of machinery of heading 84.28:

8431.4Of machinery of heading 84.26, 84.29 or 84.30:

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Products classified under Tariff item 84.31

Boule Flattener Drive Capstan

A drive capstan for grinding flats on crystal boules to indicate conductivity type. This is a part of machinery of heading 84.25, specifically designed for use with crystal boule grinding equipment.

CMP Polisher Carrier Capstan

A capstan for chemical mechanical polishing carriers in wafer planarization. This is a part of machinery of heading 84.25, specifically designed for use with CMP polishing equipment.

Crystal Boule Grinder Capstan Drum

A rotary capstan drum for crystal grinders that shape semiconductor boules to precise wafer diameters and flats indicating conductivity. This is a part of machinery of heading 84.25, specifically designed for use with crystal grinding equipment.

Crystal Boule Grinder Hoist Assembly

A hoist assembly integrated with crystal boule grinders to precisely shape semiconductor crystal boules to wafer diameters and add conductivity flats. This is a part of machinery of heading 84.25, specifically designed for use with grinding equipment in semiconductor manufacturing.

Crystal Ingot Puller Counterweight Assembly

A counterweight system for stable pulling in semiconductor ingot growers. This is a part of machinery of heading 84.25, specifically designed for use in semiconductor crystal growing equipment.

Czochralski Crystal Puller for Wafer Production

A precision machine that pulls monocrystalline silicon boules from molten silicon using the Czochralski method, essential for semiconductor wafer manufacturing. This is a part of machinery of heading 84.25, specifically designed for use in semiconductor crystal growing equipment.

Czochralski Crystal Puller Mechanism

A specialized pulling mechanism used in Czochralski crystal growers for producing monocrystalline silicon boules from which semiconductor wafers are sliced. This is a part of machinery of heading 84.25, specifically designed for use in semiconductor crystal growing equipment.

Double-Sided Wafer Lapper Winch

A winch for simultaneous double-sided lapping of semiconductor wafers. This is a part of machinery of heading 84.25, specifically designed for use with wafer lapping equipment.

Float Zone Crystal Grower Mechanism

A specialized hoist mechanism for the float zone method to produce high-purity silicon crystals by zone melting without crucibles. This is a part of machinery of heading 84.25, specifically designed for use in semiconductor crystal growing equipment.

Float Zone Crystal Grower Winch Assembly

A winch assembly designed for float zone crystal growers that produce high-purity silicon rods for semiconductor wafers. This is a part of machinery of heading 84.25, specifically designed for use in semiconductor crystal growing equipment.

Gallium Arsenide Crystal Grinder Hoist

A specialized hoist for grinding GaAs crystal boules to precise diameters for compound semiconductor wafers. This is a part of machinery of heading 84.25, specifically designed for use with gallium arsenide crystal grinding equipment.

Precision Wafer Polisher Lift Assembly

An elevator-style lift assembly for chemical-mechanical wafer polishers ensuring surface flatness critical for semiconductor device fabrication. This is a part of machinery of heading 84.25, specifically designed for use with wafer polishing equipment.

Semiconductor Wafer Lapping Hoist

A lifting hoist for wafer lappers that achieve ultra-flat surfaces on sliced wafers within tight dimensional tolerances for fabrication. This is a part of machinery of heading 84.25, specifically designed for use with wafer lapping equipment.

Silicon Ingot Puller Control Pulley

A control pulley system for automated ingot pullers in Czochralski silicon growth, regulating pull speed and rotation. This is a part of machinery of heading 84.25, specifically designed for use in semiconductor crystal growing equipment.

Wafer Slicing Saw Pulley Drive

Pulley and drive components for high-precision diamond saws that slice monocrystalline boules into semiconductor wafers. This is a part of machinery of heading 84.25, specifically designed for use with wafer slicing saws.

Forklift Battery Side Curtain

Protective steel enclosure panels designed to shield forklift battery compartments on electric models classified under heading 84.27. These panels bolt directly to battery tray frames and prevent accidental contact with high-voltage batteries, ensuring operator safety. They are principal parts of forklift trucks and are classified under tariff item 8431.20.00 as parts of machinery of heading 84.27.

Forklift Carriage Bar Kit

Adjustable side thrust bars and load backrest components designed for forklift carriages under heading 84.27. These components stabilize pallet loads during elevation and are precision machined for standard carriage profiles. They are principal parts of forklift trucks and fall under tariff item 8431.20.00.

Forklift Control Valve Manifold

Directional control valve manifold assembly for forklift hydraulic systems under heading 84.27. This valve regulates flow to lift, tilt, and side-shift functions, with machined ports that match forklift valve bodies precisely. It is a principal part of forklift trucks and is classified under tariff item 8431.20.00.

Forklift Hydraulic Cylinder Assembly

Hydraulic cylinder assembly designed specifically for forklift trucks under heading 84.27, converting fluid power into linear motion for lifting and tilting loads. It features seals and mounting points tailored to forklift applications. This cylinder is a principal part of forklift trucks and falls under tariff item 8431.20.00.

Forklift Hydraulic Hose Quick Coupler

Flat-face quick disconnect couplers for forklift hydraulic attachments under heading 84.27, enabling tool-free connection of forks, clamps, and other implements. These couplers are rated for high-pressure lift circuits and are principal attachment parts. They are classified under tariff item 8431.20.00 as parts of forklift trucks.

Forklift Load Backrest Extension

Structural steel extension panel for forklift load backrests under heading 84.27, preventing load tip-over during transport. It features welded brackets that match carriage mounting patterns and is a principal safety part. This panel is classified under tariff item 8431.20.00.

Forklift Mast Chain Drive Kit

Complete chain drive system including sprockets and roller chains for elevating forks on forklift masts under heading 84.27. Engineered for high-tensile strength to handle heavy pallet loads, it is a principal lift part. This kit falls under tariff item 8431.20.00.

Forklift Mast Pulley Sheave

Machined steel pulley sheaves for wire rope or chain hoists in forklift masts under heading 84.27, guiding lift mechanisms smoothly. Grooved for specific rope diameters, they are principal lift parts. These sheaves are classified under tariff item 8431.20.00.

Forklift Mast Roller Bearing Set

Cam-follower roller bearings for forklift mast uprights under heading 84.27, reducing friction during fork elevation under heavy loads. Sized for standard mast channels, they are principal motion transmission parts. These bearings are classified under tariff item 8431.20.00.

Forklift Operator Presence Switch

Seat-activated safety switch for forklifts under heading 84.27, preventing operation without a seated operator by interrupting power to the drive system. It integrates with forklift electrical harnesses and is a principal safety part. This switch is classified under tariff item 8431.20.00.

Forklift Overhead Guard Leg Assembly

Structural tubular steel legs for forklift overhead guards under heading 84.27, protecting operators from falling objects. They bolt to chassis with forklift-specific hole patterns and are principal safety structure parts. These legs are classified under tariff item 8431.20.00.

Forklift Platform Step Assembly

Anti-slip serrated steel step platform for order picker forklifts under heading 84.27, with integrated handrail mounts for operator access. Sized for standard chassis widths, it is a principal operator platform part. This step assembly is classified under tariff item 8431.20.00.

Forklift Tilting Cylinder Mount Bracket

Heavy-duty cast steel bracket securing tilt cylinders to forklift masts under heading 84.27, absorbing shear forces during load manipulation. Precision bored for cylinder pins, it is a principal part. This mount bracket is classified under tariff item 8431.20.00.

Pallet Truck Roller Wheel Assembly

Polyurethane roller wheels with precision bearings for pallet trucks under heading 84.27, providing smooth low-profile movement under heavy loads. Includes axles configured for pallet truck frames, making them principal parts. These wheel assemblies are classified under tariff item 8431.20.00.

Walkie Stacker Control Pendant

Pendant controller with ergonomic grip and proportional joystick for walkie stackers under heading 84.27, managing lift/lower and travel functions. Weather-sealed for warehouse use, it is a principal control part. This pendant is classified under tariff item 8431.20.00.

Elevator Buffer Striker Pad

A replaceable polyurethane pad attached to the elevator car or counterweight that contacts hydraulic or spring buffers at the pit level. It absorbs impact energy safely and is designed exclusively for use with elevators of heading 84.28.

Elevator Car Top Inspection Station

A control box mounted on the elevator car roof for maintenance personnel to operate during inspections, with hoistway access buttons. It is a dedicated part for passenger or freight elevators of heading 84.28 and is required by safety regulations.

Elevator Controller Mounting Bracket

Heavy-gauge steel brackets used to secure the main elevator controller cabinet to hoistway walls in passenger elevators. They are designed solely for use with elevators of heading 84.28 and provide vibration isolation.

Elevator Counterweight Roller Guide

Roller assemblies that guide the counterweight along rails in passenger elevators to minimize sway. They are designed solely for elevators of heading 84.28 and enhance ride stability while reducing wear.

Elevator Emergency Battery Backup Box

A sealed enclosure housing batteries and an inverter for emergency car lighting and operation in passenger elevators. It is dedicated for use with elevators of heading 84.28 and meets emergency power requirements.

Elevator Guide Rail Bracket Set

Precision-machined brackets that secure guide rails to the elevator shaft structure, designed only for passenger and freight elevators. They are classified under this tariff item due to their principal use with elevators of heading 84.28.

Elevator Rope Grip and Socket

A forged steel socket with a wedge grip used to secure wire ropes to the elevator car or counterweight. It is exclusively for passenger and freight elevators and is critical for the suspension system's integrity.

Elevator Safety Gear Brake Assembly

This assembly includes the brake components and linkage designed specifically for passenger elevators to stop the car in case of overspeed. It falls under this tariff item as a part solely for use with elevators of heading 84.28.

Freight Elevator Door Interlock Mechanism

A mechanical and electrical device ensuring elevator doors remain locked until the car is properly positioned at the landing. This part is exclusive to freight elevators of heading 84.28 and prevents unsafe door operation.

Freight Elevator Floor Leveling Switch

Precision magnetic or optical switches that detect the exact car position for door alignment in freight elevators. They are exclusive to elevators of heading 84.28 and ensure accurate leveling within 3/4 inch.

Freight Elevator Load Weighing Sensor

Strain gauge sensors mounted under the cab floor to monitor freight load capacity in real-time. They are specific to freight elevators of heading 84.28 and prevent overloading while integrating with controls.

Freight Elevator Pit Ladder Assembly

A foldable or fixed steel ladder providing safe access to the elevator pit for maintenance on freight installations. It is specific to freight elevators of heading 84.28 and complies with access requirements.

Passenger Elevator Cab Lighting Fixture

An LED lighting assembly integrated into the elevator ceiling for interior illumination, designed exclusively for passenger cars. It fits this tariff item as a part principally for elevators of heading 84.28 and meets emergency lighting standards.

Passenger Elevator Car Operating Panel

A control panel mounted inside the elevator car with buttons, display, and emergency controls tailored for passenger elevators. It is classified under this tariff item as a dedicated part for elevators of heading 84.28.

Passenger Elevator Door Hanger Rollers

Heavy-duty rollers with precision bearings that support and guide horizontally sliding elevator doors along tracks. They are principal parts for passenger elevators of heading 84.28 and ensure smooth door operation.

Boule Handling Robot End-Effector

A boule handling robot end-effector is a specialized vacuum or gripper attachment designed to safely lift and transport heavy semiconductor crystal boules between processing stations. It is a part principally used with machinery of heading 84.28, such as robotic handling systems in wafer manufacturing equipment, and falls under tariff item 8431.39.00 as 'other' parts.

Crystal Boule Grinder

A crystal boule grinder is a precision machine used to shape semiconductor crystal boules to exact diameters and grind flats for conductivity type identification. It is a part of wafer preparation equipment under heading 84.28, and as a part of such machinery, it is classified under tariff item 8431.39.00 as 'other' parts.

Crystal Growth Crucible Holder

A crystal growth crucible holder is a high-purity graphite or quartz component that precisely positions the crucible in Czochralski furnaces during silicon pulling. It is an essential part of crystal grower machines classified under heading 84.28, and therefore falls under tariff item 8431.39.00 as 'other' parts.

Crystal Ingot Alignment Fixture

A crystal ingot alignment fixture is a precision device that aligns semiconductor ingots before grinding or slicing operations. It is designed solely for wafer preparation machinery of heading 84.28, and as a part of such machinery, it is classified under tariff item 8431.39.00 as 'other' parts.

Czochralski Crystal Puller Furnace

A Czochralski crystal puller furnace is a high-temperature furnace used to grow monocrystalline silicon boules for semiconductor wafers. It is a part of crystal grower equipment classified under heading 84.28 for other machinery, and therefore falls under tariff item 8431.39.00 as 'other' parts.

Diamond Slurry Distribution Manifold

A diamond slurry distribution manifold evenly distributes diamond slurry across wafer lapping and polishing platens in semiconductor preparation equipment. It is a specific part for machinery of heading 84.28, and is classified under tariff item 8431.39.00 as 'other' parts.

Float Zone Crystal Grower

A float zone crystal grower is an apparatus that uses the float zone method to produce ultra-pure monocrystalline semiconductor boules by melting and recrystallizing silicon rods. It is classified as machinery of heading 84.28 for semiconductor material processing, and its parts fall under tariff item 8431.39.00 as 'other' parts.

RF Coil Assembly for Float Zone Puller

An RF coil assembly for a float zone puller is a radio frequency induction coil that creates the molten zone in float zone crystal growth systems. It is a specific part for heading 84.28 semiconductor machinery, and is included under tariff item 8431.39.00 as 'other' parts.

Seed Crystal Rotation Mechanism

A seed crystal rotation mechanism is a motorized device that rotates the seed crystal at precise speeds during Czochralski pulling to ensure uniform boule diameter. It is a critical part for heading 84.28 crystal growers, and is classified under tariff item 8431.39.00 as 'other' parts.

Semiconductor Wafer Slicing Diamond Saw

A semiconductor wafer slicing diamond saw is a diamond wire or blade saw designed to slice ultra-thin wafers from monocrystalline semiconductor boules without damage. It is essential wafer preparation machinery of heading 84.28, and its parts are classified as 'other' under tariff item 8431.39.00.

Single-Side Wafer Polisher Head

A single-side wafer polisher head is a carrier head assembly that holds and polishes one side of semiconductor wafers to a mirror finish for device fabrication. It is a part of wafer polishing equipment in heading 84.28, and falls under tariff item 8431.39.00 for 'other' such parts.

Wafer Bow Measurement Fixture

A wafer bow measurement fixture holds wafers during bow and warp measurement in grinding process control stations. It is designed for wafer grinder and polisher equipment of heading 84.28, and its parts are classified under tariff item 8431.39.00 as 'other' parts.

Wafer Edge Profiling Tool

A wafer edge profiling tool is tooling for grinding precise edge profiles on semiconductor wafers to prevent chipping during handling. It is a part of wafer grinding equipment under heading 84.28, and is covered by tariff item 8431.39.00 as 'other' parts.

Wafer Lapping Machine Platen

A wafer lapping machine platen is a cast iron or composite platen used for lapping semiconductor wafers to precise flatness before polishing. It is a part of wafer grinder, lapper, or polisher equipment under heading 84.28 for semiconductor processing, and is classified in tariff item 8431.39.00 as 'other' parts.