U.S. exports of Cotters and Cotter Pins of Iron or Steel (HS 731824) totaled $19.0M in August 2026.
Importers of Cotters and Cotter Pins of Iron or Steel paid $2.6M in duties in August 2026, an average duty rate of 54.65% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule.
Last updated: August 2026 dataCotters and cotter pins of iron or steel — split-pin and solid-taper fasteners used to secure axles, clevis pins, and shaft assemblies in agricultural, automotive, and industrial machinery — are classified under a single 10-digit line (7318240000). Japan leads US imports in this heading, a reflection of Japan's deep integration into precision machinery and automotive supply chains, with China, Germany, Mexico, and Czech Republic also supplying the market. The narrow product scope and single tariff line mean that correct heading classification hinges on distinguishing cotters and cotter pins from other non-threaded fasteners classified under 731829.
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711 import shipments a month
Cotter pins (731824) are mechanical fasteners inserted through a hole in a bolt, axle, or shaft and bent to lock a component in place — they function as retention devices in machinery. Safety pins, dressmakers' pins, and push pins (731940) are entirely different articles used for fabric, packaging, or office applications. The end-use and mechanical function are the primary classification criteria; a cotter pin used in a wheel hub assembly is unambiguously 731824.
Mexico is among the top suppliers of cotter pins to the US market, and goods qualifying as originating under USMCA rules of origin may enter duty-free, providing a cost advantage over non-FTA sources. Importers should verify that Mexican-origin cotter pins meet the applicable USMCA tariff shift or regional value content requirement and obtain a valid certificate or certification of origin to claim the preference.
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Subheading 7 of 12 in heading 7318
Subheading 731824 · $19.0M of $543.4M
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 7318240000 | Cotters and Cotter Pins, of Iron or Steel | $4.7M | 54.65% | 96.79% | $2.6M |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 7318240000 | Cotters and Cotter Pins, of Iron or Steel | $19.0M |
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Exports · August 2026
destination
Mexico and Canada together take 48% of it.
customs district
origin
entry
rate provision · imports
3.2% enters free of duty; duty collected equals 54.65% of imports for consumption.
ImportsExports
Imports
$4.8MYoY · free account
Exports
$19.0MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $62.5M of Cotters and Cotter Pins of Iron or Steel and exported $216.7M.
Through August 2026. Source: U.S. Census Bureau.