In plain English
FAR 52.247-62, Specific Quantities Unknown, is a contract clause prescribed at FAR 47.305-16(d)(2), most recently dated Apr 1984. 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 47.305-16(d)(2), insert the following clause in solicitations and contracts when total requirements and destinations to which shipments will be made are known, but the specific quantity to be shipped to each destination cannot be predetermined. This clause protects the interests of both the Government and the contractor during the course of the performance of the contract., insert the following clause in solicitations and contracts when total requirements and destinations to which shipments will be made are known, but the specific quantity to be shipped to each destination cannot be predetermined. This clause protects the interests of both the Government and the contractor during the course of the performance of the contract.
Prescribing reference: FAR 47.305-16(d)(2).
The official text, verbatim
As prescribed in 47.305-16(d)(2), insert the following clause in solicitations and contracts when total requirements and destinations to which shipments will be made are known, but the specific quantity to be shipped to each destination cannot be predetermined. This clause protects the interests of both the Government and the contractor during the course of the performance of the contract., insert the following clause in solicitations and contracts when total requirements and destinations to which shipments will be made are known, but the specific quantity to be shipped to each destination cannot be predetermined. This clause protects the interests of both the Government and the contractor during the course of the performance of the contract.
Specific Quantities Unknown (Apr 1984)
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(a) For the purpose of evaluating "f.o.b. destination" offers, the Government estimates that the quantity specified will be shipped to the destinations indicated:
Estimated Quantity Destination(s) _______________
_______________
_______________
_______________
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(b) If the quantity shipped to each destination varies from the quantity estimated, and if the variation results in a change in the transportation costs, appropriate adjustment shall be- made.
(End of clause)