Chapter 84 — Machinery and mechanical appliances, boilers, nuclear reactors; parts thereof 4-digit heading

84.21 Centrifuges, including centrifugal dryers; filtering or purifying machinery and apparatus for liquids or gases

One level above the number you declare. Pick one of the six-digit codes below.

Section XVI, Machinery & Electrical — machinery, mechanical appliances, electrical and electronic equipment.

  1. 84 Chapter Machinery and mechanical appliances, boilers, nuclear reactors; parts thereof
  2. 21 Heading Centrifuges, including centrifugal dryers; filtering or purifying machinery and apparatus for liquids or gases
  3. —— Subheading Pick one of the 12 six-digit codes below

Chapter 84 covers machinery and mechanical appliances, boilers, nuclear reactors; parts thereof: industrial machinery, engines, pumps, computers and other non-electrical mechanical equipment. With 86 headings and 538 six-digit codes, it's the largest chapter in the Harmonized System and covers most industrial and computing equipment. Classification tip: Machines are usually classified by function (what the machine does) rather than the industry that uses it, and parts generally follow the classification of the finished machine they belong to: check both rules before assigning a code.

All of chapter 84

The 12 six-digit codes under 84.21

One of these is the number you declare.

Other headings in chapter 84

84.01 Nuclear reactors; fuel elements (cartridges), non-irradiated, for nuclear reactors, machinery and apparatus for isotopic separation 84.02 Boilers; steam or other vapour generating (other than central heating hot water boilers, capable also of producing low pressure steam), super heated water boilers 84.03 Central heating boilers; excluding those of heading no. 8402 84.04 Auxiliary plant for use with boilers of heading no. 8402 or 8403; e.g. economisers, super-heaters, soot removers, gas recoverers), condensers for steam or other vapour power units 84.05 Generators for producer or water gas with or without their purifiers acetylene gas generators and similar water process gas generators, with or without their purifiers 84.06 Turbines; steam and other vapour turbines 84.07 Reciprocating or rotary internal combustion piston engines 84.08 Compression-ignition internal combustion piston engines (diesel or semi-diesel engines) 84.09 Parts suitable for use solely or principally with the engines of heading no. 8407 or 8408 84.10 Turbines; hydraulic water wheels and regulators therefor 84.11 Turbo-jets, turbo-propellers and other gas turbines 84.12 Engines and motors; n.e.c. (e.g. reaction engines, hydraulic power engines, pneumatic power engines) 84.13 Pumps; for liquids, whether or not fitted with measuring device, liquid elevators 84.14 Air or vacuum pumps, air or other gas compressors and fans; ventilating or recycling hoods incorporating a fan; gas-tight biological safety cabinets whether or not fitted with filters 84.15 Air conditioning machines; comprising a motor driven fan and elements for changing the temperature and humidity, including those machines in which the humidity cannot be separately regulated 84.16 Furnace burners for liquid fuel, for pulverised solid fuel or for gas; mechanical grates, mechanical ash dischargers and similar appliances 84.17 Furnaces and ovens; industrial or laboratory, including incinerators, non-electric 84.18 Refrigerators, freezers and other refrigerating or freezing equipment, electric or other; heat pumps other than air conditioning machines of heading no. 8415 84.19 Machinery, plant (not domestic), or laboratory equipment; electrically heated or not, (excluding items in 85.14) for the treatment of materials by a process involving change of temperature; including instantaneous or non electric storage water heaters 84.20 Machines; calendering or other rolling machines, for other than metal or glass and cylinders therefor 84.22 Dish washing machines; machinery for cleaning, drying, filling, closing, sealing, capsuling or labelling bottles, cans, boxes, bags, etc, machinery for aerating beverages 84.23 Weighing machines; excluding balances of a sensitivity of 5cg or better, including weight operated counting or checking machines and weights of all kinds 84.24 Mechanical appliances for projecting, dispersing or spraying liquids or powders; fire extinguishers, spray guns, steam, sand blasting machines 84.25 Pulley tackle and hoists other than skip hoists; winches and capstans; jacks 84.26 Derricks, cranes, including cable cranes, mobile lifting frames, straddle carriers and works trucks fitted with a crane 84.27 Fork-lift and other works trucks; fitted with lifting or handling equipment 84.28 Lifting, handling, loading or unloading machinery; n.e.c. in heading no. 8425, 8426 or 8427 (e.g. lifts, escalators, conveyors, teleferics) 84.29 Bulldozers, graders, levellers, scrapers, angledozers, mechanical shovels, excavators, shovel loaders, tamping machines and road rollers, self-propelled 84.30 Moving, grading, levelling, scraping, excavating, tamping, compacting, extracting or boring machinery, for earth, minerals, or ores; pile drivers and extractors; snow ploughs and snow blowers 84.31 Machinery parts; used solely or principally with the machinery of heading no. 8425 to 8430 84.32 Agricultural, horticultural or forestry machinery for soil preparation or cultivation; lawn or sports-ground rollers 84.33 Harvesting and threshing machinery, straw and fodder balers, grass or hay mowers; machines for cleaning, sorting or grading eggs, fruit or other agricultural produce, other than machinery of heading no 8437 84.34 Milking machines and dairy machinery 84.35 Presses, crushers and similar machinery; used in the manufacture of wine, cider, fruit juices or similar beverages 84.36 Agricultural, horticultural, forestry, poultry-keeping, bee-keeping machinery; including germination plant fitted with mechanical or thermal equipment; poultry incubators and brooders 84.37 Machines for cleaning, sorting, grading seed, grain, dried leguminous vegetables; machinery used in the milling industry for the working of cereals or dried leguminous vegetables, not farm type machinery 84.38 Machinery n.e.c. in this chapter, for the industrial preparation or manufacture of food or drink; other than machinery for extraction or preparation of animal or fixed vegetable or microbial fats or oils 84.39 Machinery; for making pulp of fibrous cellulosic material, or for making or finishing paper or paperboard 84.40 Book-binding machinery; including book-sewing machines 84.41 Machines; for making up paper pulp, paper or paperboard, including cutting machines of all kinds 84.42 Machinery, apparatus and equipment (excluding machines of headings 8456 to 8465) for preparing or making printing components; plates, cylinders and other printing components; lithographic stones prepared for printing purposes 84.43 Printing machinery; used for printing by means of plates, cylinders and other printing components of heading 84.42; other printers, copying machines and facsimile machines, whether or not combined; parts and accessories thereof 84.44 Textile machinery; for extruding, drawing, texturing or cutting man-made textile materials 84.45 Textile machinery; spinning, doubling, twisting machines, textile reeling or winding machines and machines for preparing textile yarns for use on machines of heading no. 8446 and 8447 84.46 Weaving machines (looms) 84.47 Knitting machines, stitch-bonding machines and machines for making gimped yarn, tulle, lace, embroidery, trimmings, braid or net and machines for tufting 84.48 Machinery, auxiliary; for use with machines of heading no. 8444 to 8447 (e.g. dobbies, jacquards, automatic stop motions, shuttle changing mechanisms) parts, accessories for machines of heading no. 8444, 8447 84.49 Machinery; for manufacture or finishing felt or non-wovens in the piece or in shapes, including machinery for making felt hats, blocks for making hats 84.50 Household or laundry-type washing machines; including machines which both wash and dry 84.51 Machinery (not of heading no. 8450) for washing, cleaning, wringing, drying, ironing, pressing, bleaching, dyeing, dressing, finishing, coating or impregnating textile yarn, fabrics or made up articles 84.52 Sewing machines; other than book-sewing machines of heading no. 8440; furniture, bases and covers specially designed for sewing machines; sewing machine needles 84.53 Machinery for preparing, tanning or working hides, skins or leather or for making or repairing footwear or other articles of hides, skins or leather, other than sewing machines 84.54 Converters, ladles, ingot moulds and casting machines; of a kind used metallurgy or in metal foundries 84.55 Metal-rolling mills and rolls therefor 84.56 Machine-tools; for working any material by removal of material, by laser or other light or photon beam, ultrasonic, electro-discharge, electro-chemical, electron beam, ionic-beam, or plasma arc processes; water-jet cutting machines 84.57 Machining centres, unit construction machines (single station) and multi-station transfer machines for working metal 84.58 Lathes for removing metal 84.59 Machine-tools; (including way-type unit head machines) for drilling, boring, milling, threading or tapping by removing metal, other than lathes of heading no. 8458 84.60 Machine-tools; for deburring, sharpening, grinding, honing, lapping, polishing or otherwise finishing metal, sintered metal carbides or cermets by means of grinding stones, abrasives or polishing products 84.61 Machine-tools; for planing, shaping, slotting, broaching, gear cutting and grinding, finishing, sawing, cutting off and other tools working by removing metal, sintered metal carbides or cermets n.e.c. 84.62 Machine-tools (including presses) for working metal by forging, hammering or die forging (excluding rolling mills); machine-tools (including presses, slitting lines and cut-to-length lines) for working metal by bending, folding, straightening, flattening, 84.63 Machine-tools; n.e.c. for working metal, sintered metal carbides or cermets without removing material 84.64 Machine-tools; for working stone, ceramics, concrete, asbestos-cement or like mineral materials or for cold working glass 84.65 Machine-tools; (including machines for nailing, stapling, glueing or otherwise assembling) for working wood, cork, bone, hard plastics or rubber or similar hard materials 84.66 Parts & accessories suited for use only/mainly with machines of headings 8456-8465, including work/tool holders, self-opening dieheads, dividing heads & other special attachments for the machines; tool holders for any type of tool for working in the hand 84.67 Tools; for working in the hand, pneumatic, hydraulic or with self-contained electric or non-electric motor 84.68 Machinery and apparatus for soldering, brazing, welding, whether or not capable of cutting, other than those of heading no. 8515; gas-operated surface tempering machines and appliances 84.70 Calculating machines and pocket-size data recording, reproducing and displaying machines with calculating functions; accounting machines, postage-franking machines, ticket-issuing machines and similar, incorporating a calculating device; cash registers 84.71 Automatic data processing machines and units thereof, magnetic or optical readers, machines for transcribing data onto data media in coded form and machines for processing such data, not elsewhere specified or included 84.72 Office machines; not elsewhere classified 84.73 Machinery; parts and accessories (other than covers, carrying cases and the like) suitable for use solely or principally with machines of headings 84.70 to 84.72 84.74 Machinery for sorting, screening, separating, washing, crushing, grinding, mixing or kneading earth, stone, ores in solid form, shaping, moulding machinery for solid mineral fuels 84.75 Machines; for assembling electric or electronic lamps, tubes, valves, flashbulbs, in glass envelopes, machines for manufacturing or hot working glass or glassware 84.76 Automatic goods-vending machines (e.g. postage stamp, cigarette, food or beverage machines), including money-changing machines 84.77 Machinery; for working rubber or plastics or for the manufacture of products from these materials, n.e.c. in this chapter 84.78 Machinery; for preparing or making up tobacco, n.e.c. in this chapter 84.79 Machinery and mechanical appliances; having individual functions, n.e.c. in this chapter 84.80 Moulding boxes for metal foundry, moulding patterns, moulds for metals (excluding ingot moulds), metal carbides, glass, mineral materials, rubber or plastics 84.81 Taps, cocks, valves and similar appliances for pipes, boiler shells, tanks, vats or the like, including pressure-reducing valves and thermostatically controlled valves 84.82 Ball or roller bearings 84.83 Transmission shafts (including cam and crank) and cranks; bearing housings and plain shaft bearings; gears and gearing; ball or roller screws; gear boxes and other speed changers; flywheels and pulleys; clutches and shaft couplings 84.84 Gaskets and similar joints of metal sheeting combined with other material or of two or more layers of metal; sets or assortments of gaskets and similar joints, dissimilar in composition, put up in pouches, envelopes or similar packings; mechanical seals 84.85 Machines for additive manufacturing 84.86 Machines and apparatus of a kind used solely or principally for the manufacture of semiconductor boules or wafers, semiconductor devices, electronic integrated circuits or flat panel displays; machines & apparatus specified in note 11 (C) to this Chapter 84.87 Machinery parts; not containing electrical connectors, insulators, coils, contacts or other electrical features, n.e.c. in this chapter

The wording above is the Harmonized System nomenclature as published by the World Customs Organization, HS 2022 edition. It is a classification reference, not a tariff: it carries no duty rates, and it stops at six digits — the importing country adds its own beyond that.

Classification is decided by the General Rules of Interpretation and the section and chapter notes, and it is the importing country’s customs authority that makes it binding.

Shipping goods under 84.21? A customs hold shows up as a milestone that stops moving — follow the container or the air waybill from departure to delivery.

Track a shipment

84.21 FAQ

Heading 84.21 covers centrifuges, including centrifugal dryers; filtering or purifying machinery and apparatus for liquids or gases. It is part of chapter 84 (machinery and mechanical appliances, boilers, nuclear reactors; parts thereof), and it is subdivided into 12 six-digit subheadings — the level you actually declare.

Pick one of the 12 subheadings below. Those six digits are what customs recognises internationally; the importing country may extend them to eight or ten in its own tariff schedule.

The General Rules of Interpretation, read together with the notes to Section XVI and to chapter 84. A description that reads right is not enough on its own — the notes routinely pull goods out of the chapter they obviously belong to and put them somewhere else. Where duty or licensing turns on the answer, ask the importing country’s customs authority for a binding ruling.

A wrong or missing code is one of the common reasons customs holds a container, and a hold shows up as a milestone that stops moving. Watch for it in the container tracking app, on the air waybill in the air cargo tracker, or through the tracking API.

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