SUPPLEMENTARY INFORMATION:

Background

On September 29, 2025, Commerce published the Preliminary Determination in this investigation and invited interested parties to comment.^[1] Due to the lapse in appropriations and Federal Government shutdown, on November 14, 2025, Commerce tolled all deadlines in administrative proceedings by 47 days.^[2] Additionally, due to a backlog of documents that were electronically filed via Enforcement and Compliance's Antidumping and Countervailing Duty Centralized Electronic Service System (ACCESS) during the Federal Government shutdown, on November 25, 2025, Commerce tolled all deadlines in administrative proceedings by an additional 21 days.^[3] Accordingly, the deadline for this final determination is now April 20, 2026.

For a complete description of the events that occurred since the Preliminary Determination, see the Issues and Decision Memorandum.^[4] The Issues and Decision Memorandum is a public document and is on file electronically via ACCESS. ACCESS is available to registered users at https://access.trade.gov. In addition, a complete version of the Issues and Decision Memorandum can be accessed directly at https://access.trade.gov/​frnotices.

Scope of the Investigation

The products covered by this investigation are chassis from Thailand. For a complete description of the scope of this investigation, see Appendix I.

Scope Comments

During the course of this investigation, Commerce received scope comments from interested parties. Commerce issued a Preliminary Scope Decision Memorandum to address these comments and set aside a period of time for parties to address scope issues in scope-specific case and rebuttal briefs.^[5] Between August and September 2025, Commerce received scope case and rebuttal briefs from interested parties.^[6] On February 10, 2026, the petitioner requested a scope exclusion.^[7] After analyzing these comments, we made changes to the scope of the investigation published in the Preliminary Determination, as noted in Appendix I.

Verification

Commerce conducted verification of the information relied upon in making its final determination in this investigation, in accordance with section 782(i) of the Tariff Act of 1930, as amended (the Act). Specifically, Commerce conducted on-site verification of the sales and cost information submitted by Dee Siam Manufacturing Co., Ltd. (Dee Siam)'s U.S. affiliate, CIMC Intermodal Equipment, LLC (CIE US).^[8] We used standard verification procedures, including an examination of relevant sales and accounting records, and original source documents provided by CIE US.

Analysis of Comments Received

All issues raised in the case and rebuttal briefs submitted by interested parties in this investigation are addressed in the Issues and Decision Memorandum. For a list of the issues addressed in the Issues and Decision Memorandum, see Appendix II.

Changes Since the Preliminary Determination

We made certain changes since the Preliminary Determination. For a discussion of these changes, see the Issues and Decision Memorandum.

Use of Adverse Facts Available (AFA)

As discussed in the Issues and Decision Memorandum, Commerce assigned an estimated weighted-average dumping margin on this basis of AFA, pursuant to sections 776(a) and (b) of the Act, to one company ( i.e., Panus Assembly Co., Ltd. (Panus)) that significantly impeded this proceeding.^[9] Accordingly, for the reasons explained in the Issues and Decision Memorandum, and consistent with Commerce's practice, as AFA, we assigned a dumping margin of 129.63 percent to Panus.^[10]

All-Others Rate

Sections 733(d)(1)(A)(ii) and 735(c)(5)(A) of the Act provide that, Commerce shall determine an estimated all-others rate for all other exporters and producers not individually examined. This rate shall be an amount equal to the weighted average of the estimated weighted-average dumping margins established for exporters and producers individually examined, excluding rates that are zero, de minimis, or determined entirely under section 776 of the Act.

In this investigation, Commerce calculated an individual estimated weighted-average dumping margin for Dee Siam. Because Dee Siam's dumping margin is the only individually calculated dumping margin that is not zero, de minimis, or based entirely on facts otherwise available, the estimated weighted-average dumping margin calculated for Dee Siam is the margin assigned to all other producers and exporters.^[11]

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Final Determination

Commerce determines that the following estimated weighted-average dumping margins exist:

Disclosure

Commerce intends to disclose the calculations performed in connection with this final determination to interested parties within five days of any public announcement or, if there is no public announcement, within five days of the date of publication of this notice in the Federal Register , in accordance with 19 CFR 351.224(b).

Suspension of Liquidation

In accordance with section 733(d)(1)(B) of the Act, Commerce instructed U.S. Customs and Border Protection (CBP) to suspend liquidation of all entries of subject merchandise, as described in Appendix I of this notice, which were entered, or withdrawn from warehouse, for consumption on or after September 29, 2025, the date of publication of the Preliminary Determination in the Federal Register . In accordance with section 733(d) of the Act, we instructed CBP to discontinue the suspension of liquidation of all entries of subject merchandise entered or withdrawn from warehouse, on or after March 28, 2026, but to continue the suspension of liquidation of all entries of subject merchandise on or before March 27, 2026. If the U.S. International Trade Commission (ITC) issues a final affirmative injury determination, we will issue an AD order, reinstate the suspension of liquidation under section 736(a) of the Act, and require a cash deposit of estimated antidumping duties for such entries of subject merchandise, as follows: (1) the cash deposit rate for subject merchandise exported by one of the companies listed in the table above is the company-specific estimated weighted-average dumping margin listed for the company in the table; (2) if the exporter of the subject merchandise is not listed in the table above, but the producer is, then the cash deposit rate will be the company-specific estimated weighted-average dumping margin listed for the producer of the subject merchandise in the table above; and (3) the cash deposit rate for all other producers and exporters is the all-others estimated weighted-average dumping margin listed in the table above. If the ITC determines that material injury, or threat of material injury, does not exist, then this proceeding will be terminated, the suspension of liquidation will be lifted, and all cash deposits for estimated antidumping duties will be refunded.

ITC Notification

In accordance with section 735(d) of the Act, we will notify the ITC of our final affirmative determination of sales at LTFV. Because the final determination in this proceeding is affirmative, in accordance with section 735(b)(2) of the Act, the ITC will make its final determination as to whether the domestic industry in the United States is materially injured, or threatened with material injury, by reason of imports of epoxy resins from Thailand no later than 45 days after this final determination. If the ITC determines that material injury or threat of material injury does not exist, the proceeding will be terminated and all cash deposits will be refunded or canceled, and suspension of liquidation will be lifted. If the ITC determines that such injury does exist, Commerce will issue an AD order directing CBP to assess, upon further instruction by Commerce, antidumping duties on all imports of the subject merchandise that are entered, or withdrawn from warehouse, for consumption on or after the effective date of the suspension of liquidation, as discussed above in the “Suspension of Liquidation” section.

Administrative Protective Order

This notice will serve as the only reminder to parties subject to an APO of their responsibility concerning the disposition of proprietary information disclosed under APO in accordance with 19 CFR 351.305(a)(3). Timely written notification of the return or destruction of APO materials or conversion to judicial protective order is hereby requested. Failure to comply with the regulations and terms of an APO is a sanctionable violation.

Notification to Interested Parties

This final determination and notice are issued and published in accordance with sections 735(d) and 777(i) of the Act, and 19 CFR 351.210(c).

Appendix I

Scope of the Investigation

The merchandise covered by this investigation consists of chassis and subassemblies thereof whether finished or unfinished, whether assembled or unassembled, whether coated or uncoated, regardless of the number of axles, for carriage of containers, or other payloads (including self-supporting payloads) for road, marine roll-on/roll-off (RORO) and/or rail transport. Chassis are typically, but are not limited to, rectangular framed trailers with a suspension and axle system, wheels and tires, brakes, a lighting and electrical system, a coupling for towing behind a truck tractor, and a locking ( printed page 22133) system or systems to secure the shipping container or containers to the chassis using twistlocks, slide pins or similar attachment devices to engage the corner fittings on the container or other payload.

Subject merchandise includes, but is not limited to, the following subassemblies:

• Chassis frames, or sections of chassis frames, including kingpin assemblies, bolsters consisting of transverse beams with locking or support mechanisms, goosenecks, drop assemblies, extension mechanisms and/or rear impact guards;
• Running gear assemblies or axle assemblies for connection to the chassis frame, whether fixed in nature or capable of sliding fore and aft or lifting up and lowering down, which may or may not include suspension(s) (mechanical or pneumatic), wheel end components, slack adjusters, dressed axles, brake chambers, locking pins, and tires and wheels; and
• Assemblies that connect to the chassis frame or a section of the chassis frame, such as but not limited to, pintle hooks or B-trains (which include a fifth wheel), which are capable of connecting a chassis to a converter dolly or another chassis.

Importation of any of these subassemblies, whether assembled or unassembled, constitutes an unfinished chassis for purposes of this investigation.

Subject merchandise also includes chassis, whether finished or unfinished, entered with components such as, but not limited to: hub and drum assemblies, brake assemblies (either drum or disc), bare axles, brake chambers, suspensions and suspension components, wheel end components, landing gear legs, spoke or disc wheels, tires, brake control systems, electrical harnesses and lighting systems.

Processing of finished and unfinished chassis and components such as trimming, cutting, grinding, notching, punching, drilling, painting, coating, staining, finishing, assembly, or any other processing either in the country of manufacture of the in-scope product or in a third country does not remove the product from the scope. Inclusion of other components not identified as comprising the finished or unfinished chassis does not remove the product from the scope.

Individual components entered and sold by themselves are not subject to the investigation, but components entered with a finished or unfinished chassis are subject merchandise. A finished chassis is ultimately comprised of several different types of subassemblies. Within each subassembly there are numerous components that comprise a given subassembly.

This scope excludes dry van trailers, refrigerated van trailers and flatbed trailers. Dry van trailers are trailers with a wholly enclosed cargo space comprised of fixed sides, nose, floor and roof, with articulated panels (doors) across the rear and occasionally at selected places on the sides, with the cargo space being permanently incorporated in the trailer itself. Refrigerated van trailers are trailers with a wholly enclosed cargo space comprised of fixed sides, nose, floor and roof, with articulated panels (doors) across the rear and occasionally at selected places on the sides, with the cargo space being permanently incorporated in the trailer and being insulated, possessing specific thermal properties intended for use with self-contained refrigeration systems. Flatbed (or platform) trailers consist of load carrying main frames and a solid, flat or stepped loading deck or floor permanently incorporated with and supported by frame rails and cross members.

The scope also excludes fully and permanently assembled trailers that have permanently incorporated floors welded to the frame without a locking mechanism, a gross axle weight ratings of 8,000 lbs or less, and that connect to Federal Highway Administration Class 3 or Class 5 vehicles with a coupler rated for SAE J684 Standard Class 4, whether entered with or without neck, ramp, dove tail, or dump/safety arm components. The scope also excludes fully dressed axle subassemblies with a gross axle weight rating of 8,000 lbs or less, an outer diameter of the axle beam of three inches or less, and eight or fewer lug nuts.

The finished and unfinished chassis subject to this investigation are typically classified in the Harmonized Tariff Schedule of the United States (HTSUS) at subheadings: 8716.39.0090 and 8716.90.5060. Imports of finished and unfinished chassis may also enter under HTSUS subheading 8716.90.5010. While the HTSUS subheadings are provided for convenience and customs purposes, the written description of the merchandise under investigation is dispositive.

Appendix II

List of Topics Discussed in the Final Decision Memorandum

I. Summary

II. Background

III. Changes Since the Preliminary Determination

IV. Discussion of the Issues

Comment 1: Dee Siam's Further Manufacturing General and Administrative (G&A) and Indirect Selling Expense Ratios

Comment 2: Whether to Exclude Non-Subject Expenses from Dee Siam's Further Manufacturing G&A Ratio

Comment 3: Whether to Grant Dee Siam a Constructed Export Price (CEP) Offset

Comment 4: Constructed Value (CV) Profit and Selling Expenses

Comment 5: Whether to Apply Total Adverse Facts Available (AFA) to Panus

V. Recommendation

91 FR 22130