7318.21.00.30—Helical spring lock washers
General
5.8%
Units
kg
Column 2
35%
Special
Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) 2.9% (JP)
7318.21.00.30—Helical spring lock washersGeneral
5.8%
Units
kg
Column 2
35%
Special
Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) 2.9% (JP)
Supplier development
Tandom’s paid supplier-development service helps industrial buyers identify and evaluate alternative manufacturers, compare quotes, qualify samples, and prepare a first order. Buyers retain supplier approval and all customs and compliance decisions.
Exporting to the United States
Tandom’s Americas Desk works with manufacturers outside the United States on the commercial side of entering it: buyer research, targeted outreach, qualifying the opportunities that come back, quote support, and follow-up.
Tandom · Duty calculator
Tandom · AD/CVD catalog
HTS links are screening indicators. Review each order's written scope before deciding whether it may cover a shipment.
HTS 7318.21.00.30 is the U.S. Harmonized Tariff Schedule classification for Helical spring lock washers. It's a 10-digit statistical line in Chapter 73: Articles of iron or steel, Section XV: Base Metals and Articles of Base Metal, used by U.S. Customs and Border Protection to determine the duty rate at entry. 11 Chapter 99 flags link to this code (3 active, 8 expired), and 2 potentially relevant AD/CVD order flags link to this code. A Chapter 99 flag is not a shipment-level determination; origin, product facts, claims, and entry date control whether a provision applies.
New to HTS codes? Read our guide on how HTS classification works →
Chapter 99 flags linked to this code; applicability depends on origin, product facts, claims, and entry date
| Code | Authority | Rate |
|---|---|---|
| 9903.80.03 | section_232Expired | The duty provided in the applicable subheading + 25% |
| 9903.81.84 | section_232Expired | The duty provided in the applicable subheading + 25% |
| 9903.81.86 | section_232Expired | The duty provided in the applicable subheading + 25% |
| 9903.81.90 | section_232Expired | The duty provided in the applicable subheading + 50%. |
| 9903.81.92 | section_232Expired | The duty provided in the applicable subheading. |
| 9903.81.93 | section_232Expired | The duty provided in the applicable subheading + 50%. |
| 9903.81.97 | section_232Expired | The duty provided in the applicable subheading + 25% |
| 9903.81.99 | section_232Expired | The duty provided in the applicable subheading + 25% |
| 9903.82.02 | section_232Active | 50% |
| 9903.82.04 | section_232Active | 25% |
| 9903.82.15 | section_232Active | 10% |
HTS-linked orders that may be relevant to imports under this code. An HTS link is a screening aid; actual coverage depends on each order's written product scope. Run the AD/CVD lookup → to check whether your specific shipment is in scope.
Past CBP decisions classifying real products under this HTS code. Useful precedent when classifying a similar product — each ruling shows how CBP interpreted the code for a specific case.
The tariff classification of a plastic o-ring from China, a plastic spacer, a stainless steel socket screw and a stainless steel lock washer from Taiwan and a plastic loop clamp from an undetermined country
The tariff classification of a helical spring lock washer and a clevis pin from China and Taiwan.
The tariff classification of a carriage bolt, double helical spring lock washer and a hex flange nut from China and Taiwan.
The tariff classification of pole line hardware from China
The tariff classification of a fasteners from Taiwan
Source: CBP CROSS (view all rulings on rulings.cbp.gov →)
HTS 7318.21.00.30 is the U.S. Harmonized Tariff Schedule classification for Helical spring lock washers. It belongs to Chapter 73 of the HTSUS.
The general (Column 1) duty rate for HTS 7318.21.00.30 is 5.8%. This is the most-favored-nation (MFN) rate that applies to imports from World Trade Organization member countries.
The HTS special-rate notation for 7318.21.00.30 is Free (A,AU,B,BH,CL,CO,D,E,IL,JO,KR,MA,OM,P,PA,PE,S,SG) 2.9% (JP). It can reference programs such as USMCA, KORUS, AGOA, and GSP; a program must be authorized on the entry date, and the shipment must satisfy its rules of origin and documentation requirements before a special rate can be claimed.
The Column 2 rate for HTS 7318.21.00.30 is 35%. This rate applies to imports from countries that do not have normal trade relations with the United States (currently Belarus, Cuba, North Korea, and Russia).
Tandom links section_232 provision 9903.80.03 to HTS 7318.21.00.30. Its published rate notation is The duty provided in the applicable subheading + 25%, and its status on 2026-09-25 is expired. 10 additional Chapter 99 flags also link to this code. A flag is not a shipment-level determination; check origin, product facts, claims, and entry date.
Tandom links 2 potentially relevant AD/CVD order flags to this code: A-583-820 (AD, Taiwan), A-570-822 (AD, China). An HTS link is a screening aid; review each order's written scope and linked case materials to determine whether a product is covered.
Programs referenced by the HTS Special-column notation
Special-column notation identifies rate candidates only. The shipment must independently satisfy the program's current authorization, origin, and documentation rules before a special rate can be claimed.
Section and chapter notes that govern this code
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) Ferro-cerium and other pyrophoric alloys (heading 3606); (c) Headgear and parts thereof of heading 6506 or 6507; (d) Umbrella frames or other articles of heading 6603; (e) Goods of chapter 71 (for example, precious-metal alloys, base metal clad with precious metal, imitation jewelry); (f) Articles of section XVI (machinery, mechanical appliances, and electrical equipment); (g) Assembled railway or tramway track (heading 8608); (h) Articles of section XVII (vehicles, aircraft, vessels); (ij) Instruments or apparatus of section XVIII (clocks, optical, musical, arms); (k) Lead shot prepared for ammunition (heading 9306); (l) Articles of section XX (furniture, toys, games, sports); or (m) Hand sieves, buttons, pens, pencil holders, pen nibs, monopods, bipods, tripods, and similar articles of section XX.
Throughout this schedule, the expression 'parts of general use' means: (a) Articles of heading 7307, 7312, 7315, 7317, or 7318, and similar articles of other base metal; (b) Springs and leaves for springs, of base metal, other than clock or watch springs (heading 9114); and (c) Articles of headings 8301, 8302, 8308, 8310.
Throughout this schedule, the expression 'base metals' means: iron and steel, copper, nickel, aluminum, lead, zinc, tin, tungsten (wolfram), molybdenum, tantalum, magnesium, cobalt, bismuth, cadmium, titanium, zirconium, antimony, manganese, beryllium, chromium, germanium, vanadium, gallium, hafnium, indium, niobium (columbium), rhenium, and thallium.
Tandom guides relevant to this code
Where trade compliance APIs fit in a broker's filing pipeline: HTS classification, duty calculation, AD/CVD scope match, and post-summary corrections.
Open resource
Drop the Tandom Duty Calculator API into a TMS, broker software, or in-house ERP. Code samples, the response shape, and ACE reporting order, in 2026.
Open resource
What changed April 6, 2026, what stayed the same, and how to file a steel, aluminum, or copper line in ACE without leaving duty exposure on the table.
Open resource
How to subscribe to CBP Cargo Systems Messaging Service and triage the messages that change broker filing behavior, without losing the ones that matter.
Open resource
How to read, order, and report Chapter 99 HTS codes alongside the base classification on a US entry summary in 2026. The full stacking ladder for brokers and compliance teams.
Open resource
A working guide to the inputs, the layers, and the math behind a US entry summary in 2026. Written for brokers, forwarders, and importer compliance teams.
Open resource