Using Nails on Plywood
In the United States, the lengths and diameters of some types of nails are indicated by their size in pennies.
An 8d finishing nail and an 8d common nail are about the same length, but have different diameters.
If the plywood is 3/4″ thick, the nail to use is the 6d. The type can be either casing or finishing. For 5/8″ thick plywood, 6d to 8d finishing is more suited. For 1/2″ thick plywood, 6d – 8d nails (finishing) are ideal. The 4d – 6d nails (finishing) are suitable if the plywood is 3/8″ thick.
The 3/4″ – 1″ is most suitable for 1/4″ thick plywood. The 3/4″ – 1″ nail type should be brads. Other nails you can use for 1/4″ thick plywood are the 3d (finishing).
This is only a general guideline for nail sizes and usage; making a few variations to the sizes given may be necessary in some cases.