The "Ordnance Manuals for Use Of..." 1840s through 1860s provide the specifications for all the fasteners used by the Armies of the North and South in the construction of their equipment, and also specify which of those fasteners will be used and where placed on equipment of and accompanying field artillery and park service.
From the index of the 1863 Ordnance Manual ... "Nails: Wrought and Cut: Dimensions, 66, Horseshoe: Weight, 154. " The information for each piece of equipment refers to that information in the Manual. So if someone goes through the manual counting nails and other fasteners, they are likely to see how frequently each nail/fastener was used by the army, at least in its equipment.
I would be interested to hear what Army projects were delayed. I didn't know that the Armies built projects other than bridges and emplacements.
tremontnail.com still makes and sells cut nails.