Commerce formally opens antidumping investigations of linear hydraulic cylinders from five countries, with alleged dumping margins reaching 744.85 percent, after an unusual industry polling exercise and warnings about an unusually aggressive scope
WASHINGTON, September 15, 2026. The United States Department of Commerce has formally launched one of the broadest trade remedy actions of the year, publishing Federal Register notices on Sunday, September 14 that initiate antidumping investigations of certain linear hydraulic cylinders and parts thereof from Canada, China, India, South Korea, and Mexico, alongside companion countervailing duty investigations covering China, India, and Mexico. The cases target a component found in nearly every piece of heavy equipment sold in America, from excavators and dump trucks to farm implements, forklifts, and garbage compactors, and they arrive with some of the highest alleged dumping margins seen in a petition in years.
According to the initiation notice published at 91 FR 58060, the petitioners allege dumping margins of 248.33 to 744.85 percent for Canada, 85.31 to 370.67 percent for India, 73.09 to 158.74 percent for South Korea, and 56.79 to 157.12 percent for Mexico. For China, which Commerce treats as a non-market economy, the alleged margins vary by the surrogate country used to value production inputs: 149.86 to 394.07 percent using Malaysia, 103.05 to 197.07 percent using Mexico, and 299.38 to 440.48 percent using Turkey. Commerce accepted all three proposed surrogates for purposes of initiation.
The investigations were initiated effective September 8, 2026, and signed by Deputy Assistant Secretary for Policy and Negotiations Christopher Abbott. The petitions were filed on July 29, 2026 on behalf of the Hydraulic Cylinders Fair Trade Coalition and its individual members: Aggressive Hydraulics Inc., Hol-Mac Corporation, Ligon Hydraulics, Prince Manufacturing Corporation, PTC Alliance LLC, Rosenboom Machine & Tool Inc., Scot Industries Inc., Stillwell Inc., and Texas Hydraulics Inc., all domestic producers of linear hydraulic cylinders.
A Rare Polling of the Industry
The road to initiation was longer and more contested than usual. Under the trade statute, Commerce must find that a petition is supported by the domestic industry before opening an investigation, a threshold that requires supporters to account for at least 25 percent of total domestic production and more than 50 percent of the production of that portion of the industry expressing a view on the petition. In most cases, that determination is made on the papers within 20 days.
Here, Commerce took the comparatively rare step of polling the industry. On August 18, 2026, the agency extended the initiation deadline by 20 days, explaining that it was not clear from the petitions whether the industry support criteria had been met. Polling questionnaires went out to all known domestic producers on August 20, and the petitioners commented on the responses at the end of the month. The extended deadline fell on September 7, a federal holiday, pushing the decision to September 8. In the initiation notice, Commerce concluded on the basis of the polling data that the support thresholds were satisfied and that linear hydraulic cylinders constitute a single domestic like product.
The polling exercise hints at a divided industry, which is unsurprising given the structure of the U.S. hydraulic cylinder market. Several of the largest consumers of cylinders are original equipment manufacturers that also produce cylinders in-house or through captive foreign affiliates, and some domestic producers import cylinders or components to round out their product lines. How those cross-currents play out will matter again at the injury phase before the U.S. International Trade Commission.
A Scope That Reaches Into the Supply Chain
The proposed scope covers linear acting hydraulic cylinders with steel barrels, a bore size of 25.4 millimeters, or one inch, or more, and a retracted length of at least 101.6 millimeters, or four inches. It enumerates virtually every design in commercial use, including tie-rod, welded body, telescopic, plunger, rodless, differential, position sensing, single acting, double acting, displacement, ram type, piggy-back, double rod, rod-fed, and spring return cylinders.
More consequentially for the metals supply chain, the scope also captures key components: steel barrels, steel piston rods, and any part or component of a hydraulic cylinder that is attached to, assembled with, or shipped with a covered barrel or rod. Covered barrels are welded or seamless steel tubes at least four inches long with an inner diameter of at least one inch that have been precision machined by honing or skiving and burnishing, processed to the point of having as their sole or predominant use a barrel for an in-scope cylinder. Covered piston rods are solid or hollow steel bars or tubes at least four inches long that have been hard chrome plated or coated, cut to length, and machined to be a piston rod.
Attachments such as flanges, trunnions, clevises, lugs, pistons, rings, gaskets, seals, valves, sensors, and hydraulic tubing are covered only when imported with, attached to, or invoiced with a covered cylinder, barrel, or rod. The scope does not cover such attachments, parts, or components when imported or invoiced separately. In a provision aimed squarely at equipment importers, cylinders attached to or imported with machinery classified in Chapter 84 of the tariff schedule are covered, although only the hydraulic cylinder itself, including everything in between and including the mounting pins on either end, is subject. The scope also includes anti-circumvention language covering merchandise that undergoes assembly or minor processing in a third country.
Commerce itself flagged reservations about how far the petitioners are reaching. The agency wrote in the notice that it has concerns related to the administrability of certain provisions in the proposed scope, singling out the sole or predominant use test for steel barrels, which it said remains an outstanding issue. Commerce adopted the language for purposes of initiation but stated that it intends to continue evaluating the scope with the possibility of making additional modifications. Trade law commentators, including the international trade team at Crowell & Moring’s trade law blog, have noted that the petitioners are pressing for an unusually broad scope, and scope comments are due by 5:00 p.m. Eastern Time on September 28, 2026, with rebuttals due October 8.
The subject merchandise enters under Harmonized Tariff Schedule statistical reporting numbers 8412.21.0015, 8412.21.0030, 8412.21.0045, 8412.21.0060, 8412.21.0075, and 8412.90.9005, although as always the written scope description is dispositive.
The Allegations
The petitioners allege that dumped and subsidized imports have caused material injury through a significant increase in the volume of subject imports, reduced market share, underselling and price depression and suppression, lost sales and revenues, declines in U.S. shipments, production, and capacity utilization, and a negative impact on the domestic industry’s financial performance. They further allege that imports from each country exceed the statutory negligibility threshold.
The periods of investigation are July 1, 2025 through June 30, 2026 for Canada, India, Korea, and Mexico, and January 1, 2026 through June 30, 2026 for China under the non-market economy rules. For the market economy countries, the petitioners based normal value on home market pricing gathered through market research, and for Korea they also used constructed value after finding that certain Korean home market prices were below the cost of production. For China, factors of production were valued using a U.S. producer’s production experience and product-specific consumption rates, with overhead, selling and administrative expenses, and profit drawn from Malaysian and Turkish producers of comparable merchandise.
The sheer number of foreign producers identified in the petitions illustrates how fragmented the global cylinder industry is: six companies in Canada, 42 in India, 14 in Korea, 55 in Mexico, and 38 in China. For the market economy countries, Commerce will select mandatory respondents from Customs and Border Protection entry data, which was released to interested parties under administrative protective order on September 8. For China, quantity and value questionnaires have gone out to the largest identified producers and exporters, with responses due by September 22. Chinese companies that fail to file a timely quantity and value response will not receive separate rate consideration, meaning they would default to the China-wide rate, and separate rate applications are due 21 days after publication of the initiation notice.
Why the Margins Are So High
An alleged margin of 744.85 percent against Canada, a high-cost market economy and USMCA partner, will strike many observers as extraordinary, and it deserves context. Petition-stage margins are calculated by the petitioners themselves using the pricing and cost information reasonably available to them, and Commerce’s role at initiation is limited to checking that the allegations are adequately supported and accurately calculated on their own terms. Actual margins determined after questionnaires, on-site verification, and briefing are frequently far lower than petition allegations. Still, the petition figures set the ceiling for preliminary cash deposit exposure in a worst case, and they signal how aggressively the domestic industry intends to litigate.
The inclusion of Canada and Mexico is itself notable. Trade remedy cases against USMCA partners have multiplied in the current enforcement climate, and this case joins active or recent proceedings involving Canadian and Mexican steel-intensive products. For Mexico in particular, the case lands on top of an already complex tariff picture for machinery inputs, and for Canada it adds a private-industry track to a bilateral trade relationship already strained by the tariff and retaliation cycle that has played out through 2026.
Stakes for Equipment Makers and Buyers
Linear hydraulic cylinders are the muscles of mobile equipment. They lift excavator booms, tilt truck beds, steer combines, raise scissor lifts, and compact refuse. Original equipment manufacturers in construction, agriculture, mining, material handling, and waste management source cylinders globally, balancing domestic capacity against imported supply that is often cheaper, available in shorter lead times, or built to specifications domestic producers do not offer at volume. Duties at anything approaching the alleged levels would force a rapid repricing of that global sourcing model.
The component coverage raises the stakes further. Because the scope reaches honed steel barrels and chrome-plated piston rods, duties would touch not only finished cylinder imports but also the intermediate inputs that some U.S. cylinder assemblers themselves import to remain competitive. Equipment manufacturers that import machines with cylinders already installed face a subtler problem: under the Chapter 84 provision, the cylinder inside an imported excavator or attachment is itself subject merchandise, which will require importers to identify, value, and report a component buried inside a larger article, an administrability challenge Commerce has acknowledged.
For the petitioning coalition, largely mid-sized, family-owned and privately held manufacturers concentrated in the Midwest and South, the case is framed as a matter of survival against import competition they contend is priced below fair value in every major supplying country at once. Their injury narrative will emphasize idled capacity and compressed margins during the period of investigation. Importers and purchasers will counter that domestic capacity cannot meet demand across the full range of bore sizes and configurations, and that duties will simply raise costs for American equipment builders competing globally.
The Road Ahead
The procedural clock is now running on multiple tracks. The U.S. International Trade Commission’s preliminary injury determination is due within 45 days of the petition filing under the schedule the commission set when it instituted its investigations in early August. A negative commission determination for any country would terminate the investigation for that country. At Commerce, the preliminary countervailing duty determinations for China, India, and Mexico are due first, followed by the preliminary antidumping determinations, which the statute sets at no later than 140 days after initiation unless postponed, placing them around late January 2027 with extensions likely.
Preliminary affirmative determinations would trigger suspension of liquidation and cash deposit requirements at the calculated rates, and the petitioners can be expected to seek critical circumstances findings if import data shows a surge following the petition filing, a pattern that played out this very week in the tin mill products case against China, where Commerce ordered 90-day retroactive deposits alongside a 66.61 percent preliminary subsidy rate.
In the near term, the action items for affected companies are concrete and dated. Scope and product characteristics comments are due September 28, with rebuttals by October 8, and parties who want the scope narrowed, clarified, or confirmed to exclude their products need to be on the record now rather than after orders issue. Chinese exporters must return quantity and value questionnaires by September 22 and file separate rate applications within 21 days of publication to avoid the country-wide rate. Importers, meanwhile, should begin quantifying potential exposure across all five origins, reviewing purchase contracts for duty allocation clauses, and considering whether pending orders can be restructured, because entries made after preliminary determinations will carry the full weight of whatever rates Commerce calculates.
The hydraulic cylinders case is also a data point in a larger trend. Petition activity in 2026 has run at a historically elevated pace, encouraged by an administration that has made import restriction the organizing principle of its economic policy and by domestic industries that see a favorable enforcement climate. Five-country cases with component coverage and third-country circumvention language, once the hallmark of the largest steel disputes, are becoming the template for mid-sized industrial products. For the global machinery supply chain, the message from Washington this week is unambiguous: no component is too far upstream to end up in a trade case.