In plain English
FAR 52.228-2, Additional Bond Security, is a contract clause prescribed at FAR 28.106-4(a), most recently dated Oct 1997. 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 28.106-4(a), insert the following clause:
Prescribing reference: FAR 28.106-4(a).
The official text, verbatim
As prescribed in 28.106-4(a), insert the following clause:
Additional Bond Security (Oct 1997)
The Contractor shall promptly furnish additional security required to protect the Government and persons supplying labor or materials under this contract if-
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(a) Any surety upon any bond, or issuing financial institution for other security, furnished with this contract becomes unacceptable to the Government;
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(b) Any surety fails to furnish reports on its financial condition as required by the Government;
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(c) The contract price is increased so that the penal sum of any bond becomes inadequate in the opinion of the Contracting Officer; or
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(d) An irrevocable letter of credit (ILC) used as security will expire before the end of the period of required security. If the Contractor does not furnish an acceptable extension or replacement ILC, or other acceptable substitute, at least 30 days before an ILC’s scheduled expiration, the Contracting officer has the right to immediately draw on the ILC.
(End of clause)