In plain English
FAR 52.225-13, Restrictions on Certain Foreign Purchases, is a contract clause prescribed at FAR 25.110, most recently dated Feb 2021. The complete official text is reproduced below, verbatim, from GSA's published FAR source files.
Its own text directs the contractor to include it in subcontracts — the exact mandate sentence is quoted in the flowdown section below.
Does it flow down to subcontracts?
Flows down — explicit mandate in the clause text
“(c) The Contractor shall insert this clause, including this paragraph (c), in all subcontracts.”— FAR 52.225-13, paragraph (c), official text
Where it's prescribed
As prescribed in 25.1103(a), insert the following clause:
Prescribing reference: FAR 25.110.
The official text, verbatim
As prescribed in 25.1103(a), insert the following clause:
Restrictions on certain foreign purchases (Feb 2021)
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(a) Except as authorized by the Office of Foreign Assets Control (OFAC) in the Department of the Treasury, the Contractor shall not acquire, for use in the performance of this contract, any supplies or services if any proclamation, Executive order, or statute administered by OFAC, or if OFAC’s implementing regulations at 31 CFR ChapterV, would prohibit such a transaction by a person subject to the jurisdiction of the United States.
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(b) Except as authorized by OFAC, most transactions involving Cuba, Iran, and Sudan are prohibited, as are most imports from Burma or North Korea, into the United States or its outlying areas. Lists of entities and individuals subject to economic sanctions are included in OFAC’s List of Specially Designated Nationals and Blocked Persons at https://home.treasury.gov/policy-issues/financial-sanctions/specially-designated-nationals-and-blocked-persons-list-sdn-human-readable-lists. More information about these restrictions, as well as updates, is available in the OFAC’s regulations at 31 CFR ChapterV and/or on OFAC’s website at https://home.treasury.gov/policy-issues/office-of-foreign-assets-control-sanctions-programs-and-information.
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(c) The Contractor shall insert this clause, including this paragraph (c), in all subcontracts.
(End of clause)