What is the length of a standard 16d nail?

A standard 16d nail is 3.5 inches long. This nail size is commonly used in construction for framing, specifically in attaching wood to wood. The designation "d" in nail sizes stands for "penny," a term that dates back to when nails were sold by the penny, and the number indicates the length of the nail.

For carpenters and builders, knowing the lengths of nails is essential for selecting the right fastener for various applications, ensuring structural integrity and holding power. The 16d nail is particularly favored in framing because it provides the necessary length to penetrate deeply into the materials being fastened.

In contrast, options representing lengths of 2.5 inches, 3 inches, and 4 inches relate to other types of nails that may serve different purposes in construction but do not match the recognized length of a standard 16d nail.