Typically talking, screws provide extra tensile power — resistance to breaking once they’re bent — than nails, and so they maintain a load higher with out pulling free. However nails flex extra readily and have extra shear power than screws, which suggests they’re much less prone to break when the joined surfaces are transferring parallel to one another. Screws are additionally surprisingly weak on the subject of torsional power, which measures their means to stay intact when twisted. This is not actually a problem with nails in any respect, and is not a lot of an element with screw when constructing a fence, until your drill’s torque is ready too excessive.
Selecting the proper sort of nails or screws is vital, too. You may need outdoor-rated screws or nails which can be correctly coated, galvanized, or made from weather-resistant materials like stainless-steel or aluminum. Screws ought to have sufficient un-threaded shank to drag the wooden collectively snugly whenever you tighten them, and nails will maintain higher if they’ve ring shanks. Each ought to have a considerable sufficient head to forestall the wooden from pulling free with out pulling out the fastener itself. In the end, both fastener can be sturdy sufficient to carry a fence collectively beneath regular circumstances.