Definition
The term "fourpenny" describes the size of a nail, indicating its length. It's an older measurement system where "penny" (represented as 'd' for denarius) originally referred to the price per hundred nails. A fourpenny nail is approximately 1.5 inches long. While not as common now, you might encounter it in older carpentry guides. It is smaller than an eightpenny nail. The term reflects a historical method of sizing fasteners. This is usually used by people restoring old structures.