40.16d Nail
What Does a 16d Nail Mean? Understanding Penny Size Nails in Construction
A 16d nail refers to a 3-1/2-inch long framing nail, commonly used in wood framing and heavy construction. But what does the “d” stand for in penny size nails? The term dates back to Roman England, where “d” denoted denarius, a Roman coin used like a penny. So, 100 16d nails would cost 16 pennies. A quick trick to estimate nail length: divide the “d” number by four and add 1/2 inch. For example, a 4d nail is 1-1/2 inches long. This nail size chart formula works up to 10d; beyond that, standard tables apply. Whether you’re selecting common nail lengths or framing nails for construction, understanding the “d” system is key to choosing the right fastener for your project.
