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HTS heading 5508 · Chapter 55

HTS 5508: Sewing thread of man-made staple fibers, whether or…

HTS heading 5508 covers sewing thread of man-made staple fibers, whether or not put up for retail sale. It has 2 tariff lines with a duty rate; the general (MFN) rates are 11.4% (1 line), 11% (1 line).

Imports may also owe Chapter 99 tariffs (Section 232, 301 or 201) depending on origin and date, plus the Merchandise Processing Fee and, by sea, the Harbor Maintenance Fee.

Rates from the 2026 HTS Revision 22, effective October 30, 2026. Source: U.S. International Trade Commission.

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Tariff lines and duty rates

HTS codeDescriptionGeneralSpecialColumn 2Estimate
5508.10.00.00Of synthetic staple fibers (200)[kg]11.4%Free (AU,BH,CL,CO,IL,JO,KR,MA,OM,P,PA,PE,S,SG)55%Estimate →
5508.20.00.00Of artificial staple fibers (200)[kg]11%Free (AU,BH, CL,CO,IL,JO,KR, MA,OM,P, PA,PE,S,SG)55%Estimate →

2 lines shown. Statistical suffixes (the last two digits) inherit the rate of the 8-digit subheading above them.

Example: base duty and fees on $10000

For HTS 5508.10.00.00 at the general rate of 11.4%, shipped by ocean, before any Chapter 99 tariffs:

Base duty (11.4%)$1140.00
Merchandise Processing Fee (0.3464%, min $34.58)$34.64
Harbor Maintenance Fee (0.125%)$12.50
Duty and fees$1187.14

Origin-specific tariffs can multiply this. Run this example from China or from Mexico to see every line.

Special program codes in this heading

AU
U.S.–Australia FTA
BH
U.S.–Bahrain FTA
CL
U.S.–Chile FTA
CO
U.S.–Colombia Trade Promotion Agreement
IL
U.S.–Israel FTA
JO
U.S.–Jordan FTA
KR
U.S.–Korea FTA (KORUS)
MA
U.S.–Morocco FTA
OM
U.S.–Oman FTA
P, P+
CAFTA-DR
PA
U.S.–Panama Trade Promotion Agreement
PE
U.S.–Peru Trade Promotion Agreement
S, S+
USMCA (United States–Mexico–Canada Agreement)
SG
U.S.–Singapore FTA

A special rate applies only when the goods qualify under that program's rules of origin and the claim is made at entry.

Frequently asked questions

What is the duty rate for HTS 5508?

Heading 5508 has 2 rate lines. The general (MFN) duty rates are 11.4% (1 line), 11% (1 line). Products of free trade agreement partners may enter at the special rate, and Column 2 rates apply to countries without normal trade relations. Chapter 99 tariffs can be added on top: calculate the full amount.

Do Section 301, 232 or 201 tariffs apply to HTS 5508?

It depends on the 8- or 10-digit subheading, the country of origin, the entry date and, for Section 232, the metal content. These additional duties are listed in Chapter 99 of the HTS. The free duty calculator checks each program for a given code, origin and date and shows which apply and why.

What fees are added to an import under HTS 5508?

Formal entries pay the Merchandise Processing Fee of 0.3464% of value (minimum $34.58, maximum $670.86 in FY2027). Ocean shipments also pay the Harbor Maintenance Fee of 0.125% of value. See the import duty calculator for how they combine.