For an #8 screw, the recommended drill bit size varies depending on the type of material being drilled. For softwood, a 3/32" drill bit is recommended, while for hardwood, a 1/8" drill bit is recommended. However, other sources suggest slightly different sizes, such as 11/64" or 5/32" for hardwood. Its important to note that these are suggested sizes and may vary depending on the specific application and the type of screw being used. Its always a good idea to test the size of the pilot hole on a scrap piece of material before drilling into the actual workpiece.