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Shanks with serrations, annular grooves, spiral flutes, or helical threads are used when a stronger, more permanent grip is required.
Thermoplastic coatings may also be added to the shaft.
The length of a nail is measured in a unit called the penny.
Today the term penny only defines the length of a nail and has nothing to do with the price.
Most nails, called common nails, have a relatively large diameter.
Box nails, originally used to make thin-walled boxes, have a smaller diameter shank than common nails.
These machines cut tapered pieces from flat iron sheet, then flattened the head.
In rural areas, black-smiths continued to make nails from wrought iron right into the 20th century.