In plain English
FAR 52.211-12, Liquidated Damages-Construction, is a contract clause prescribed at FAR 11.503(b), most recently dated Sept 2000. 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 11.503(b), insert the following clause in solicitations and contracts:
Prescribing reference: FAR 11.503(b).
The official text, verbatim
As prescribed in 11.503(b), insert the following clause in solicitations and contracts:
Liquidated Damages-Construction (Sept 2000)
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(a) If the Contractor fails to complete the work within the time specified in the contract, the Contractor shall pay liquidated damages to the Government in the amount of ____________ [Contracting Officer insert amount] for each calendar day of delay until the work is completed or accepted.
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(b) If the Government terminates the Contractor’s right to proceed, liquidated damages will continue to accrue until the work is completed. These liquidated damages are in addition to excess costs of repurchase under the Termination clause.
(End of clause)