16d refers to a 16-penny nail. The "d" in this context stands for "penny," an archaic term used to denote nail size. This system uses the pennyweight to indicate the nail's length; a higher penny number corresponds to a longer and thicker nail.
Understanding the Penny System for Nails
The penny system is an old method for sizing nails. While not as common now as other sizing systems, it's still used occasionally. The size isn't directly related to the nail's cost.
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Historical Context: The term "penny" originates from the historical cost of nails. Larger nails, requiring more material and labor, naturally cost more. This old system reflects that relationship.
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Size and Length: A 16d nail is significantly longer and thicker than, say, an 8d nail. This difference in size and strength affects the type of work each is best suited for.
Example: You might find the "16d" notation on older construction plans or when purchasing nails from specialized suppliers.
