When nailing 2x6 inch joists what nail should be used?

For nailing 2x6 inch joists, it's recommended to use 16d (16-penny) nails, which are typically 3.5 inches long. These nails provide adequate strength and holding power for structural connections. Alternatively, you can use 3-inch screws designed for structural applications for added holding strength. Always ensure that the fasteners comply with local building codes.