In plain English
FAR 52.247-10, Net Weight-General Freight, is a contract clause prescribed at FAR 47.207-4(a)(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 47.207-4(a)(2), insert the following clause in solicitations and contracts for transportation or for transportation-related services when the weight of shipments of freight other than household goods or office furniture is not known at the time of shipment and the contractor is responsible for determining the net weight of the shipments:
Prescribing reference: FAR 47.207-4(a)(2).
The official text, verbatim
As prescribed in 47.207-4(a)(2), insert the following clause in solicitations and contracts for transportation or for transportation-related services when the weight of shipments of freight other than household goods or office furniture is not known at the time of shipment and the contractor is responsible for determining the net weight of the shipments:
Net Weight-General Freight (Apr 1984)
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(a) The net weight of the shipment shall be determined by deducting the tare weight of the vehicle (determined by having the empty vehicle with a full tank of fuel weighed by a certified weighmaster on a certified scale) from the gross weight of the vehicle (determined by having the loaded vehicle with a full tank of fuel weighed by a certified weighmaster on a certified scale).
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(b) The Contractor shall attach the original copies of the empty and loaded weight certificates to the invoice for services.
(End of clause)