# United States tariff, chapter 84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof (page 6 of 6) > The United States tariff has 1,706 national lines in HS chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances; parts… Page 6 of 6. Source: https://border.bot/countries/united-states/hs-codes/84?page=6 Last updated: 9 October 2026 [Countries](https://border.bot/countries) / [United States](https://border.bot/countries/united-states) / [Chapter 84](https://border.bot/countries/united-states/hs-codes/84) Page 6 of 6: subheadings 501 to 538 of 538. Previous page: [page 5](https://border.bot/countries/united-states/hs-codes/84?page=5). ## Key facts - National lines: 1,706 - Subheadings: 538 - Tariff: [United States](https://border.bot/countries/united-states) - Chapter: 84: Nuclear reactors, boilers, machinery and mechanical appliances; parts thereof ## Subheadings with United States lines The United States tariff has 1,706 national lines in HS chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances; parts thereof), under 538 subheadings in 86 headings. ### 84.80 Molding boxes for metal foundry; mold bases; molding patterns; molds for metal (other than ingot molds), metal carbides, glass, mineral materials, rubber or plastics - [8480.71](https://border.bot/countries/united-states/hs-codes/848071) Moulds for rubber or plastics: Injection or compression types (5 lines) - [8480.79](https://border.bot/countries/united-states/hs-codes/848079) Moulds for rubber or plastics: Other (4 lines) ### 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; parts thereof - [8481.10](https://border.bot/countries/united-states/hs-codes/848110) Pressure-reducing valves (4 lines) - [8481.20](https://border.bot/countries/united-states/hs-codes/848120) Valves for oleohydraulic or pneumatic transmissions (8 lines) - [8481.30](https://border.bot/countries/united-states/hs-codes/848130) Check (nonreturn) valves (5 lines) - [8481.40](https://border.bot/countries/united-states/hs-codes/848140) Safety or relief valves (1 line) - [8481.80](https://border.bot/countries/united-states/hs-codes/848180) Other appliances (35 lines) - [8481.90](https://border.bot/countries/united-states/hs-codes/848190) Parts (8 lines) ### 84.82 Ball or roller bearings, and parts thereof - [8482.10](https://border.bot/countries/united-states/hs-codes/848210) Ball bearings (17 lines) - [8482.20](https://border.bot/countries/united-states/hs-codes/848220) Tapered roller bearings, including cone and tapered roller assemblies (9 lines) - [8482.30](https://border.bot/countries/united-states/hs-codes/848230) Spherical roller bearings (2 lines) - [8482.40](https://border.bot/countries/united-states/hs-codes/848240) Needle roller bearings, including cage and needle roller assemblies (1 line) - [8482.50](https://border.bot/countries/united-states/hs-codes/848250) Other cylindrical roller bearings, including cage and roller assemblies (1 line) - [8482.80](https://border.bot/countries/united-states/hs-codes/848280) Other, including combined ball/roller bearings (4 lines) - [8482.91](https://border.bot/countries/united-states/hs-codes/848291) Parts: Balls, needles and rollers (8 lines) - [8482.99](https://border.bot/countries/united-states/hs-codes/848299) Parts: Other (14 lines) ### 84.83 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 - [8483.10](https://border.bot/countries/united-states/hs-codes/848310) Transmission shafts (including cam shafts and crank shafts) and cranks (6 lines) - [8483.20](https://border.bot/countries/united-states/hs-codes/848320) Bearing housings, incorporating ball or roller bearings (4 lines) - [8483.30](https://border.bot/countries/united-states/hs-codes/848330) Bearing housings, not incorporating ball or roller bearings; plain shaft bearings (10 lines) - [8483.40](https://border.bot/countries/united-states/hs-codes/848340) Gears and gearing, other than toothed wheels, chain sprockets and other transmission elements presented separately; ball or roller screws; gear boxes and other speed changers, including torque converters (9 lines) - [8483.50](https://border.bot/countries/united-states/hs-codes/848350) Flywheels and pulleys, including pulley blocks (4 lines) - [8483.60](https://border.bot/countries/united-states/hs-codes/848360) Clutches and shaft couplings (including universal joints) (3 lines) - [8483.90](https://border.bot/countries/united-states/hs-codes/848390) Toothed wheels, chain sprockets and other transmission elements presented separately; parts (11 lines) ### 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 - [8484.10](https://border.bot/countries/united-states/hs-codes/848410) Gaskets and similar joints of metal sheeting combined with other material or of two or more layers of metal (1 line) - [8484.20](https://border.bot/countries/united-states/hs-codes/848420) Mechanical seals (1 line) - [8484.90](https://border.bot/countries/united-states/hs-codes/848490) Other (1 line) ### 84.85 Machines for additive manufacturing - [8485.10](https://border.bot/countries/united-states/hs-codes/848510) By metal deposit (1 line) - [8485.20](https://border.bot/countries/united-states/hs-codes/848520) By plastics or rubber deposit (1 line) - [8485.30](https://border.bot/countries/united-states/hs-codes/848530) By plaster, cement, ceramics or glass deposit (1 line) - [8485.80](https://border.bot/countries/united-states/hs-codes/848580) Other (1 line) - [8485.90](https://border.bot/countries/united-states/hs-codes/848590) Parts (2 lines) ### 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 and apparatus specified in note 11(C) to this chapter; parts and accessories - [8486.10](https://border.bot/countries/united-states/hs-codes/848610) Machines and apparatus for the manufacture of boules or wafers (1 line) - [8486.20](https://border.bot/countries/united-states/hs-codes/848620) Machines and apparatus for the manufacture of semiconductor devices or of electronic integrated circuits (1 line) - [8486.30](https://border.bot/countries/united-states/hs-codes/848630) Machines and apparatus for the manufacture of flat panel displays (1 line) - [8486.40](https://border.bot/countries/united-states/hs-codes/848640) Machines and apparatus specified in Note 11 (C) to this Chapter (3 lines) - [8486.90](https://border.bot/countries/united-states/hs-codes/848690) Parts and accessories (1 line) ### 84.87 Machinery parts, not containing electrical connectors, insulators, coils, contacts or other electrical features, and not specified or included elsewhere in this chapter - [8487.10](https://border.bot/countries/united-states/hs-codes/848710) Ships' or boats' propellers and blades therefor (2 lines) - [8487.90](https://border.bot/countries/united-states/hs-codes/848790) Other (2 lines) ## In other countries No other national tariff on border.bot has live lines under chapter 84 yet. - [The Harmonized System text for chapter 84](https://border.bot/hs-codes/84) Page 6 of 6: subheadings 501 to 538 of 538. Previous page: [page 5](https://border.bot/countries/united-states/hs-codes/84?page=5). - Previous chapter: [83](https://border.bot/countries/united-states/hs-codes/83) Wire, rods, tubes, plates, electrodes and similar products of base metal or of metal carbides, coated or cored with flux material, of a kind used for soldering, brazing, welding or deposition of metal or of metal carbides; wire and rods, of agglomerated base metal powder, used for metal spraying; base metal parts thereof - Next chapter: [85](https://border.bot/countries/united-states/hs-codes/85) Electric motors and generators (excluding generating sets) ## Frequently asked questions ### How many national tariff lines does the United States tariff have in HS chapter 84? The United States tariff has 1,706 national lines in HS chapter 84 (nuclear reactors, boilers, machinery and mechanical appliances; parts thereof), under 538 subheadings in 86 headings. ## Sources and updates The tariff lines for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026. The duty rates for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026. The trade programmes for the United States come from border.bot release 1 (edition 2026HTSRev21), read from the publisher’s files, and have been live since 9 October 2026. This page was last updated on 9 October 2026. Guidance from published tariff data, not a binding ruling. For a decision customs must follow, apply to the destination’s customs authority for a binding tariff ruling. Official source files: - https://hts.usitc.gov/reststop/exportList?from=0000000000&to=9999999999&format=CSV&styles=false Machine-readable: https://border.bot/countries/united-states/hs-codes/84.json?page=6