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One Assembly, Four Rules: Tracing a Defense Electronics Build Through the 2027 China Restrictions

Chris A. Grable · October 7, 2026

Summaries of the 2027 China restrictions usually go rule by rule. Engineers and buyers meet the problem part by part. This post follows a notional defense assembly, a motor controller with a processor, a printed circuit board, a permanent-magnet actuator and some imported subcomponents, through each rule in turn. The assembly is illustrative. The rules and dates are not.

The processor: who designed, produced or provided it?

Section 5949 of the FY2023 NDAA bars federal agencies from buying electronic products or services that contain or use semiconductors designed, produced or provided by SMIC, CXMT or YMTC, their subsidiaries, affiliates or successors, or an entity designated later under the statute. It takes effect 23 December 2027. The FAR Council proposed an implementing rule on 17 February 2026, and it was still a proposal on October 7, 2026.

As proposed, the rule would reach products, noncommercial services and commercial IT and telecommunications services, including COTS products and purchases at or below the micro-purchase threshold. Commercial items with no alternative source would be excepted until 23 December 2028 on a Government determination. Agency-head waivers would run no more than two years each, and lifecycle support for equipment acquired before 23 December 2027 would continue. For the processor, where it was bought is beside the point. The firm needs to know which company designed it, which produced it and who provided it.

The board: where was it fabricated, and what does it do?

10 U.S.C. 4873 bars DOW from acquiring a covered printed circuit board from China, Russia, Iran or North Korea, unless a waiver applies; buys below the micro-purchase threshold are excluded. Coverage takes two tests. The board must first be a specified type: a component of an electronic device that routes, connects, transmits or secures data and is commonly connected to a network, or another item the Secretary specifies by rule. It must then either perform a mission-critical function in a noncommercial product or service, or be a component of a defense security system or of an information system the contract identifies as national security sensitive.

The statutory date is 1 January 2027, but the prohibition reaches only contracts awarded after a final DFARS rule is issued. The advance notice, DFARS Case 2022-D011, appeared on 2 July 2026 and said the framework under consideration is not a blanket prohibition on commercial products. A proposed rule was tasked for drafting on 30 September 2026. For the controller board, the firm needs the fabricator's identity and location and a reading of the board's function against the specified-type definition.

The actuator magnet: where was the material mined and refined?

This rule is already in contracts. DFARS 252.225-7052 restricts samarium-cobalt and neodymium-iron-boron magnets, tantalum metals and alloys, and tungsten metal powder and heavy alloy. Through 31 December 2026 it bars covered material melted or produced in China, Russia, Iran or North Korea. From 1 January 2027 it bars material mined, refined, separated, melted or produced there. An end item manufactured in a covered country that contains covered material is barred too, so a compliant magnet inside it is still caught.

The exceptions carry conditions. Electronic devices are excepted unless the contract says otherwise. COTS items are excepted subject to the clause's exclusions, including a weight test that from 1 January 2027 removes items of 50 percent or more covered material. A neodymium-iron-boron magnet made from recycled material qualifies only if milling and sintering happen in the United States. A firm's difficulty finding a source is not itself an exception: relief runs through a nonavailability determination, a waiver under 10 U.S.C. 4872(c)(1) of no more than 36 months or a national-security waiver under 4872(e), each requiring a Government finding.

The imported subcomponents: could any trace to Xinjiang?

The Uyghur Forced Labor Prevention Act works at the border, not in the contract. Goods made wholly or in part in Xinjiang, or by an entity on the UFLPA Entity List, are presumed to be made with forced labor and barred from import. Overcoming the presumption requires full compliance with the published guidance, complete and substantive answers to Customs and Border Protection, and clear and convincing evidence. The list added 43 entities on 3 August 2026, so screening has to run against the current version.

What the walk-through shows

A country-of-origin label on the finished controller answers none of these four questions, and none of them depends on the Section 1260H list behind Section 805. Each asks for sub-tier facts most firms have never collected. UDC recommends three moves now:

Split the bill of materials into semiconductors, boards and assemblies, magnets and rare-earth materials, and goods with possible Xinjiang exposure, and track each class against its own rule and date.
Record the designer, producer and provider for each chip, the fabricator for each board, and the mining, refining, separation, melting and production chain for each magnet.
Start alternate qualification in 2026. In UDC's experience, qualifying replacement chips, boards and magnets routinely takes more than a year.

Public sources

The paper behind this post cites these public documents, among others.

The full paper puts the four authorities in one comparison table, covers the statutory changes to the materials rule that the clause has not yet caught up with, and gives seven recommendations for planning relief regime by regime.

The 2027 China Supply-Chain Cliff

See what is in the paper