What is the length of a 4d nail?

The length of a 4d nail is 1 ½ inches. Nails are categorized by "d" or penny size, which is a traditional measure based on the length and diameter. The "4d" indicates the size of the nail and corresponds to a specific length. In this case, 4d nails are used for lighter woodworking tasks and other applications where a shorter nail is sufficient.

Understanding the sizing of nails is important in construction and woodworking because it helps in selecting the appropriate nail for a particular job, ensuring the integrity and durability of the work being done. The other sizes mentioned do not match the 4d classification, hence they would not be suitable in this context.