What type of nail is most commonly used for nailing boards together when holding power is desired?

The most commonly used type of nail for nailing boards together when holding power is desired is the common nail. Common nails are designed specifically for construction and framing purposes, providing significant holding strength due to their length and thicker shank. They are suitable for a variety of materials and can be used in structural applications where additional grip is crucial.

Common nails have a larger head than other types of nails, which helps prevent them from being countersunk into the wood, ensuring a robust connection between the boards. The design and size of common nails make them ideal for tasks where durability and strength are necessary, such as in the assembly of wooden frameworks, flooring, and sheathing.

In contrast, finishing nails and brad nails are designed for more delicate work, such as trim and molding, where appearance matters more than holding power. Galvanized nails, while resistant to rust, are typically used in outdoor applications or in environments where exposure to moisture is a concern but do not necessarily provide greater holding power than common nails.