Spring washers and other lock washers

HTS code 7318.21.00 covers spring washers and other lock washers made of iron or steel. Use this code when importing these non-threaded articles, keeping in mind duty rates are generally 5.80% but can be free or 2.9% depending on the country of origin and any applicable trade agreements—this falls within Chapter 73 concerning articles of iron or steel.

Detailed information for HTS Code 7318.21.00

This duty applies to articles of iron or steel within Chapter 73, specifically covering screws, bolts, nuts, washers, and similar items. The 7318.21.00 code focuses on non-threaded articles, namely spring washers and other lock washers. This is further broken down into 7318.21.00.30 for helical spring lock washers and 7318.21.00.90 for all other spring washers and lock washers; use the appropriate suffix to specify the type of lock washer being reported.

Chapter	Chapter 73 - Articles of iron or steel
Section	Section XV - Base Metals and Articles of Base Metal

Duty snapshot

Quick reference for the duty outcomes tied to this HTS line.

General Duty

5.80%

Standard trade partners (NTR)

Special Duty

Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) 2.9% (JP)

Eligible FTA or preference programs

The general duty rate for HTS code 7318.21.00 (Spring washers and other lock washers) is 5.80%, applicable to imports reported in kilograms. Special rates offer preferential treatment to goods originating from specific countries or under eligible Free Trade Agreements (FTAs). These rates are 'Free' for goods originating in A, AU, B, BH, CL, CO, D, E, IL, JO, KR, MA, OM, P, PA, PE, S, and SG; 2.9% for goods originating in Japan (JP); and dependent on eligibility for other FTA or preference programs. These special rates apply to both subdivisions 7318.21.00.30 (Helical spring lock washers) and 7318.21.00.90 (Other). Section information is not specified.

Rate of Duty (Column 2): 35%

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Code subdivisions

7318.21.00.30

Screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter pins, washers (including spring washers) and similar articles, of iron or steel: > Non-threaded articles: > Spring washers and other lock washers > Helical spring lock washers

7318.21.00.90

View HTS reference

Chapter & section notes

Chapter notes

Harmonized Tariff Schedule of the United States Revision 29 (2025) Annotated for Statistical Reporting Purposes CHAPTER 73 ARTICLES OF IRON OR STEEL XV 73-1 Notes 1. In this chapter the expression "cast iron" applies to products obtained by casting in which iron predominates by weight over each of the other elements and which do not comply with the chemical composition of steel as defined in Note 1(d) to chapter 72. 2. In this chapter the word "wire" means hot- or cold-formed products of any cross-sectional shape, of which no cross-sectional dimension exceeds 16 mm. Additional U.S. Notes 1. For the purposes of heading 7304 or 7306, the rate of duty "Free (C)" appearing in the "Special" subcolumn applies only to tubes and pipes with attached fittings, suitable for conducting gases or liquids. 2. For the purposes of subheading 7307.19.30, the expression "ductile fittings" refers to fittings which contain over 2.5 percent carbon and over 0.02 percent of magnesium or of magnesium and cerium, by weight. Statistical Note 1. For the purposes of statistical reporting numbers 7310.10.0005, 7310.29.0020 and 7310.29.0055, “refillable stainless steel kegs, whether or not pressurized” refers to cylindrical kegs for liquid beverages, each keg with a domed top and bottom and a single neck piece, designed for a coupler (valve) system and an extractor tube (spear) by which the keg can be cleaned, filled and dispense the liquid contents. Harmonized Tariff Schedule of the United States Revision 29 (2025) Annotated for Statistical Reporting Purposes XV 73-2

Section notes

SECTION XV BASE METALS AND ARTICLES OF BASE METAL XV-1 Notes 1. This section does not cover: (a) Prepared paints, inks or other products with a basis of metallic flakes or powder (headings 3207 to 3210, 3212, 3213 or 3215); (b) Ferrocerium or other pyrophoric alloys (heading 3606); (c) Headgear or parts thereof of heading 6506 or 6507; (d) Umbrella frames or other articles of heading 6603; (e) Goods of

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November 15, 2025

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