HTS Heading 8421

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

All 24 HTS codes under heading 8421 (centrifuges, including centrifugal dryers), with their duty rates from the 2026 HTS Revision 23. General duty Free to 2.5%.

Every line of heading 8421

  • 8421 Centrifuges, including centrifugal dryers; filtering or purifying machinery and apparatus, for liquids or gases; parts thereof.
  • 8421.11.00.00 Cream separators (under: Centrifuges, including centrifugal dryers) (No.): General Free; Special none; Column 2 25%.
  • 8421.12.00.00 Clothes-dryers (under: Centrifuges, including centrifugal dryers) (No.): General Free; Special none; Column 2 25%.
  • 8421.19.00.00 Other (under: Centrifuges, including centrifugal dryers) (No.): General 1.3%; Special Free (A,AU,BH,C,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 25%.
  • 8421.21.00.00 For filtering or purifying water (No.): General Free; Special none; Column 2 35%.
  • 8421.22.00.00 For filtering or purifying beverages other than water (No.): General Free; Special none; Column 2 35%.
  • 8421.23.00.00 Oil or fuel filters for internal combustion engines (No.): General 2.5%; Special Free (A,AU,B,BH,C,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8421.29.00 Other (under: Filtering or purifying machinery and apparatus for liquids): General Free; Special none; Column 2 35%.
  • 8421.29.00.05 Refrigerant recovery and recycling units (No.).
  • 8421.29.00.15 Oil-separation equipment (under: Other) (No.).
  • 8421.29.00.40 Hydraulic fluid power filters, rated at 1,000 kPa or greater (No.).
  • 8421.29.00.65 Other (under: Other) (No.).
  • 8421.31.00.00 Intake air filters for internal combustion engines (No.): General 2.5%; Special Free (A,AU,B,BH,C,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG); Column 2 35%.
  • 8421.32.00.00 Catalytic converters or particulate filters, whether or not combined, for purifying or filtering exhaust gases from internal combustion engines (No.): General Free; Special none; Column 2 35%.
  • 8421.39.01 Other (under: Filtering or purifying machinery and apparatus for gases): General Free; Special none; Column 2 35%.
  • 8421.39.01.05 For machine tools of headings 8456 through 8465, inclusive (kg).
  • 8421.39.01.15 Other (under: Dust collection and air purification equipment) (kg).
  • 8421.39.01.20 Electrostatic precipitators (under: Industrial gas cleaning equipment) (No.).
  • 8421.39.01.30 Other (under: Industrial gas cleaning equipment) (No.).
  • 8421.39.01.40 Gas separation equipment (under: Other) (No.).
  • 8421.39.01.60 Pneumatic fluid power filters, rated at 550 kPa or greater (No.).
  • 8421.39.01.90 Other (under: Other) (kg).
  • 8421.91 Of centrifuges, including centrifugal dryers.
  • 8421.91.20.00 Drying chambers for the clothes-dryers of subheading 8421.12 and other parts of clothes-dryers incorporating drying chambers (No.): General Free; Special none; Column 2 25%.
  • 8421.91.40.00 Furniture designed to receive the clothes-dryers of subheading 8421.12 (No.): General Free; Special none; Column 2 25%.
  • 8421.91.60.00 Other (under: Of centrifuges, including centrifugal dryers) (kg): General Free; Special none; Column 2 25%.
  • 8421.99.01 Other (under: Parts): General Free; Special none; Column 2 35%.
  • 8421.99.01.40 Parts of machinery and apparatus for filtering or purifying water (kg).
  • 8421.99.01.80 Other (under: Other) (kg).

From MFG Calcs data: Filtering and separation equipment

U.S. imports of filtering and separation equipment (heading 8421) came to $14.03B in 2025, with $1.34B in calculated duty: an effective duty of 9.6%, every duty included.

Effective duty in Sep 2026: 9.6%, against 13.6% in Sep 2025.

Largest sources in 2025: Mexico $4.21B at 2.7% effective duty; Canada $1.55B at 1.2% effective duty; Germany $1.45B at 8.9% effective duty; China $1.25B at 42.8% effective duty; South Korea $601M at 7.9% effective duty.

These are family totals from U.S. import statistics published through USITC DataWeb, not this heading's rate alone; effective duty is calculated duty as a share of customs value, an estimate, not a ruling.

About these rates

The rates are those printed in the 2026 HTS Revision 23, published by the U.S. International Trade Commission. A 10-digit statistical line takes the rates printed on the 8-digit line above it. Chapter 99 duties (Section 232, Section 301, IEEPA) depend on the product, the origin and the date, are charged on top, and are not included. A code here is a strong lead, not a ruling: confirm it with a customs broker or a CBP binding ruling.

Last reviewed 2026-11-12.