In plain English
FAR 52.222-20, Contracts for Materials, Supplies, Articles, and Equipment, is a contract clause prescribed at FAR 22.610, most recently dated Jun 2020. The complete official text is reproduced below, verbatim, from GSA's published FAR source files.
Its text contains no sentence requiring insertion into subcontracts; see the flowdown section below for what that does and does not mean.
Does it flow down to subcontracts?
No flowdown mandate found in the clause text
We scanned the full clause text and found no sentence directing the contractor to insert this clause into subcontracts. That is a statement about the text, not legal advice: a prime contractor may still flow terms down contractually, an agency supplement (DFARS, VAAR, …) may add requirements, and clauses listed below (if any) may order this clause into subcontracts from the outside.
Where it's prescribed
As prescribed in 22.610 , insert the following clause in solicitations and contracts:
Prescribing reference: FAR 22.610.
The official text, verbatim
As prescribed in 22.610 , insert the following clause in solicitations and contracts:
Contracts for Materials, Supplies, Articles, and Equipment (Jun 2020)
If this contract is for the manufacture or furnishing of materials, supplies, articles or equipment in an amount that exceeds or may exceed the threshold specified in Federal Acquisition Regulation 22.602 on the date of award of this contract, and is subject to 41 U.S.C. chapter 65, the following terms and conditions apply:
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(a) All stipulations required by 41 U.S.C. chapter 65 and regulations issued by the Secretary of Labor (41 CFR Chapter 50) are incorporated by reference. These stipulations are subject to all applicable rulings and interpretations of the Secretary of Labor that are now, or may hereafter, be in effect.
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(b) All employees whose work relates to this contract shall be paid not less than the minimum wage prescribed by regulations issued by the Secretary of Labor (41 CFR 50-202.2). Learners, student learners, apprentices, and workers with disabilities may be employed at less than the prescribed minimum wage (see 41 CFR 50-202.3) to the same extent that such employment is permitted under section 14 of the Fair Labor Standards Act (41 U.S.C. 6508).
(End of clause)